KR101934544B1 - Electrochemical energy device with high energy density and method of fabricating the same - Google Patents

Abstract

The present invention relates to a positive electrode conductor; A positive electrode active material laminated on the positive electrode conductor; A negative electrode conductor disposed so as to face the positive electrode conductor so as to face the positive electrode active material; An electrolyte interposed between the positive electrode active material and the negative electrode conductor; A sealing part formed to surround the periphery of the positive electrode active material and the electrolyte, the upper side of which is in contact with the positive electrode conductor and the contact side is sealed and the lower side thereof is in contact with the negative electrode conductor and the contact surface is sealed; And is formed not to include the negative electrode active material. Thus, the energy density can be relatively high and the thickness can be made thin with respect to a predetermined volume, thus making it possible to realize a compact configuration, and the manufacturing process can be simplified To an electrochemical energy device having a high energy density and a manufacturing method thereof.

Description

TECHNICAL FIELD The present invention relates to an electrochemical energy device having high energy density and a method of manufacturing the same.

The present invention relates to an electrochemical energy device capable of charging and discharging electric energy by an electrochemical reaction and a method of manufacturing the same.

Energy-related technologies have been actively studied as the industry related to portable electronic devices is expanding due to the recent development of communication technology and semiconductor manufacturing technology, and the demand for development of alternative energy for environmental preservation and preparation for depletion of fossil fuels is actively studied . Among these energy-related technologies, a battery, which is a typical energy storage element, is at the center.

Lithium primary batteries in batteries have been widely applied because they are higher in voltage and higher in energy density than conventional aqueous solution batteries in terms of miniaturization and weight reduction. Such a lithium primary battery is mainly used as a main power source or backup power source for portable electronic devices. Another lithium secondary battery is an energy storage device capable of charging and discharging using an electrode material having excellent reversibility.

Lithium secondary batteries are manufactured in various shapes according to their applications. For example, the lithium secondary battery is manufactured by packaging in a cylindrical shape, a square shape, a pouch shape, or the like. Here, since the pouch-type secondary battery can be made lighter, the related art is continuously being developed. Generally, a pouch type lithium secondary battery includes a pouch type battery housing a electrode assembly in a pouch case having a space for accommodating an electrode assembly, sealing the pouch case to form a pouch bare cell, And attaching an accessory such as a protective circuit module to form a pouch core pack. However, such a pouch-type lithium secondary battery also limits the shape and size of the lithium secondary battery in terms of packaging, limits the energy density of the secondary battery itself, and forms a thin layer for application to various electronic products There is a limit to what you can do.

KR 10-2016-0001909 (Jul.

SUMMARY OF THE INVENTION The present invention has been conceived in order to solve the above-mentioned problems, and it is an object of the present invention to provide a semiconductor device having a relatively high energy density and a thin thickness, And to provide an electrochemical energy device having a high energy density which can be easily manufactured, and a manufacturing method thereof.

According to an aspect of the present invention, there is provided an electrochemical energy device having a high energy density, including: a positive electrode conductor; A positive electrode active material laminated on the positive electrode conductor; A negative electrode conductor disposed so as to face the positive electrode conductor so as to face the positive electrode active material; An electrolyte interposed between the positive electrode active material and the negative electrode conductor; And an enclosure formed to surround the periphery of the cathode active material and the electrolyte; And is characterized in that it does not include a negative electrode active material.

In addition, the negative electrode conductor is formed of any one of Cu, Ni, stainless steel (STS), and an alloy thereof.

The conductor for a negative electrode is formed of any one of Al, Sn, Ag, Au, Mg, Zn, an alloy thereof, and SnO _x (0 <x? 2).

Further, an alloy layer is formed on the upper surface of the negative electrode conductor.

Further, the alloy layer is a lithium alloy.

Further, the upper surface of the negative electrode conductor is formed with surface unevenness.

Also, an ion conductive coating layer is formed on the upper surface of the negative electrode conductor.

The ion conductive coating layer may be a polymer containing Nafion, an ionomer, a single ion conductor, an ion conductive polymer, an ion conductive hydrophilic polymer, a liquid electrolyte, or a crosslinked body thereof .

Further, the closed portion may include: a partition wall formed to surround the periphery of the cathode active material and the electrolyte; And a junction formed between the partition and the anode conductor and between the partition and the cathode conductor, respectively; And a control unit.

The sealing portion includes a bonding portion formed by bonding a laminate film layer formed on a circumferential bottom surface of a conductor for a positive electrode and a laminate film layer formed on an upper surface of a circumferential portion of the conductor for a negative electrode.

Further, the electrolyte is a solid electrolyte.

Further, the electrolyte is an electrolytic solution.

In addition, the negative electrode conductor is provided with an electrolyte injection hole penetrating the upper and lower surfaces thereof, and a sealing member for sealing is coupled to the electrolyte injection hole.

A method of manufacturing an electrochemical energy device having a high energy density according to the present invention includes: a step SA10 of arranging a positive electrode conductor, a positive electrode active material, a solid electrolyte and a negative electrode conductor in order from top to bottom; A step SA20 of forming a laminate by pressing the positive electrode active material, the positive electrode active material, the solid electrolyte and the negative electrode in a direction in which the conductors are arranged so that the contact surfaces are in close contact with each other; And a sealing step for sealing the periphery of the laminate, wherein step SA30 includes the step of sealing the periphery of the conductor for the positive electrode and the periphery of the conductor for the negative electrode by the sealing part; And a control unit.

In the step SA10, the cathode active material is coated or coated on the lower surface of the anode conductive material, and the solid electrolyte is coated or coated on the lower surface of the cathode active material or the anode conductive material.

Further, in step SA30, the sealing part is formed by thermally fusing the laminate film layer formed on the circumferential bottom surface of the anode conductor and the laminate film layer formed on the circumferential surface of the conductor for the anode, by heat fusion.

A method of manufacturing an electrochemical energy device having a high energy density according to the present invention includes disposing a conductor for a negative electrode so as to face a lower side of a conductor for a positive electrode having a positive electrode active material formed on a lower surface thereof, And arranging the barrier rib between the periphery of the conductor for the positive electrode and the periphery of the conductor for the negative electrode so that the barrier rib intervenes therebetween; A step SB20 of allowing the positive electrode active material and the negative electrode conductor to be separated from each other so that the positive electrode conductor and the partition wall and the negative electrode conductor and the partition wall are sealed to seal the contact surface; And SB30 filling the space between the positive electrode active material and the negative electrode conductor with an electrolyte solution; And a control unit.

Further, in step SB20, the barrier ribs are bonded to the positive electrode conductor and the negative electrode conductor by thermal fusion.

In addition, in step SB30, the electrolyte is filled through the electrolyte injection hole formed in the negative electrode conductor, and then the electrolyte injection hole is sealed by the sealing member.

The electrochemical energy device having a high energy density and the method of manufacturing the same of the present invention have a relatively high energy density with respect to a predetermined volume and a thin thickness so that a compact configuration can be obtained.

In addition, since the structure is simple and the packaging process can be simplified, it is easy to manufacture.

1 to 6 are cross-sectional schematic views showing embodiments of an electrochemical energy device having a high energy density of the present invention.
7 and 8 are cross-sectional schematic views showing first embodiments of a method for manufacturing an electrochemical energy device having a high energy density according to the present invention.
9 is a schematic cross-sectional view showing a second embodiment of a method for producing an electrochemical energy device having a high energy density according to the present invention.
10 is a cross-sectional schematic view showing another embodiment of the method for manufacturing an electrochemical energy device having a high energy density of the present invention.
11 is a graph showing the discharge capacity retention characteristics according to the discharge rate of the electrochemical energy storage device according to the first embodiment of the present invention.
12 is a graph showing the charge / discharge cycle life characteristics of an electrochemical energy device produced according to Example 1 of the present invention.

Hereinafter, an electrochemical energy device having high energy density and a method of manufacturing the same according to the present invention will be described in detail with reference to the accompanying drawings.

[Embodiment of electrochemical energy device]

1 to 6 are cross-sectional schematic views showing embodiments of an electrochemical energy device having a high energy density of the present invention.

As shown in the figure, the electrochemical energy device having a high energy density of the present invention comprises: a positive electrode conductor 100; A cathode active material 200 laminated on the anode active material 100; A negative electrode conductor 400 disposed so as to face the positive electrode conductor 100 so as to face the positive electrode active material 200; An electrolyte 300 interposed between the positive electrode active material 200 and the negative electrode conductor 400; And the periphery of the cathode active material 200 and the electrolyte 300 and the upper side is in contact with the positive electrode conductor 100 and the lower side is in contact with the negative electrode conductor 400 and the contact surface is sealed A sealing part (500); And may not include a negative electrode active material.

The positive electrode conductor (100) is one of the elements constituting the outer shape of the electrochemical energy element, and can be formed of a material having excellent electrical conductivity, and can be a positive electrode collector. For example, the conductor 100 for a positive electrode may be formed of a metal plate such as stainless steel (STS), aluminum or silver, or may be formed of an alloy thereof.

The positive electrode active material 200 may be formed integrally with the positive electrode active material 200 in a state where the positive electrode active material 200 is adhered to the positive electrode conductor 100 have. The cathode active material 200 may be an oxide of two or more components including at least one of lithium, nickel, cobalt, chromium, magnesium, strontium, vanadium, lanthanum, cerium, iron, cadmium, lead and manganese, ), Sulfide, fluoride, or a combination thereof. However, the present invention is not limited thereto. For example, the cathode active material may include at least two of cobalt, copper, nickel, and manganese, which are suitable for a lithium secondary battery capable of reversibly storing and releasing lithium, and may be at least one selected from the group consisting of O, F, S, P, And at least one non-metallic element selected from the group consisting of lithium-based compounds. In addition, the cathode active material 200 may be formed by bonding to a composite having a porous structure, and a composite having a porous structure may be impregnated with a liquid electrolyte, and an electrolyte may be present in the voids of the composite. The conductive material may include carbon black, ultrafine graphite particles, fine carbon such as acetylene black, nano metal particle paste, indium tin oxide (ITO) paste, etc. .

The negative electrode conductor 400 is one of the elements forming the outer shape of the electrochemical energy element together with the positive electrode conductor 100, and may be formed of a material having excellent electrical conductivity to be a negative electrode collector. The negative electrode conductor 100 may be formed of, for example, a metal material or a plate made of an alloy thereof. The negative electrode conductor 400 may be disposed to face the positive electrode conductor 100 and may be disposed below the positive electrode active material 100 and the positive electrode active material 200, Can be disposed.

The electrolyte 300 is interposed between the positive electrode active material 200 and the negative electrode conductor 400 so that the electrolyte 300 is filled between the separated positive electrode active material 200 and the negative electrode conductor 400, (300) may contact the cathode active material (200) and the anode conductor (400). The electrolyte 300 may be formed in various ways and the movement of the ions between the cathode active material 200 and the anode conductor 400 is not directly affected by the contact between the cathode active material 200 and the anode conductor 400 It is possible to play the role of enabling.

The sealing part 500 is formed so as to close the contact surface in contact with the positive electrode conductor 100 and the negative electrode conductor 400 and is formed so as to surround the periphery of the positive electrode active material 200 and the electrolyte 300, Air, foreign matter, and the like to the cathode active material 200 and the electrolyte 300 to prevent the cathode active material 200 and the electrolyte 300 from permeating. The upper surface of the sealing portion 500 may be in contact with the lower surface of the peripheral portion 110 of the anode 100 and the contact surface may be sealed. The contact surface can be sealed. Also, the inner side surface of the sealing part 500 may be formed so as to be in contact with the cathode active material 200 and the electrolyte 300. At this time, the sealing portion 500 may be formed in various ways to seal between the peripheral portion 110 of the positive electrode conductor 100 and the peripheral portion 410 of the negative electrode. At this time, the sealing part 500 may serve to separate the conductor for positive electrode 100 and the conductor for negative electrode 400 from each other so that they are not in direct contact with each other, and the outer side of the sealing part 500 may be exposed to the outside have. Thus, the positive electrode conductor 100, the negative electrode conductor 400, and the sealing portion 500 can form the overall shape of the electrochemical energy device of the present invention. That is, the positive electrode conductor 100 and the negative electrode conductor 400 themselves constitute the outer shape of the electrochemical energy element, and the outer conductor (100) and the negative electrode conductor (400) May be a terminal for electrical connection with an electric circuit or other electrochemical energy device.

Here, the electrochemical energy device of the present invention is characterized in that it does not include a negative electrode active material that forms a separate layer structure on the negative electrode conductor 400. That is, the negative electrode active material layer is not formed on the upper surface of the negative electrode conductor 400, and accordingly, the negative electrode conductor 400 itself can serve as the negative electrode collector while acting as the negative electrode active material.

In a conventional electrochemical energy device, the negative electrode active material is a core component that plays a role of reversibly intercalating and deintercalating lithium ions from the positive electrode and generating electric current by flowing current through an external circuit. Especially, Is essential for the insertion and extraction of lithium ions. The anode active material may include carbon-based materials such as low-crystalline carbon or high-crystalline carbon. The carbon-based materials have a layered structure capable of reversibly absorbing lithium ions, It is possible to effectively implement the absorption and desorption of lithium ions which are inherently required.

However, since the negative electrode active material is essentially contained in the electrochemical energy element, even if the improved negative electrode active material is included, due to the limited reversibility of the negative electrode active material and the repeated charging and discharging, stress and volume changes accumulated in the negative electrode active material, The weak mechanical durability of the active material is increased to limit the lifetime of the electrochemical energy device and the energy density can not be further improved.

On the other hand, according to the present invention, since the anode is formed of only the anode conductor by removing the anode active material, the structural rigidity is improved, the durability is improved, and the life is increased because no crack is generated.

In addition, the electrochemical energy device of the present invention can be formed in a thin shape with a very thin overall thickness because the negative electrode is formed of only the negative electrode active material without the negative electrode active material, so that the compact configuration is possible It may be easy to manufacture. And the energy density can be relatively high (large capacity) with respect to a predetermined volume. In addition, since there are no pouches, cans and covers for covering the outside of the conductor for the positive electrode and the conductor for the negative electrode, the structure is simple and can be formed as a very slim electrochemical energy element.

An electrochemical energy device using a conventional negative electrode active material was described as Comparative Example 1, and an electrochemical energy device of the present invention was described as Example 1.

[Comparative Example 1]

LiCoO ₂ as a cathode active material, polyvinylidene fluoride (PVdF) as a binder and carbon as a conductive material were mixed at a weight ratio of 96: 2: 2, and then dispersed in N-methyl-2-pyrrolidone to prepare a cathode slurry Respectively. This slurry was coated on an aluminum foil having a thickness of 15 탆, followed by drying and rolling to prepare a positive electrode. At this time, the weight of the anode coated on the aluminum foil was adjusted to 20 mg / cm 2. Polyvinylidene fluoride (PVdF) as a binder and carbon as a conductive material were mixed at a weight ratio of 90: 6: 4, and then dispersed in N-methyl-2-pyrrolidone to prepare an anode slurry . This slurry was coated on copper foil having a thickness of 10 mu m, followed by drying and rolling to prepare a negative electrode. At this time, the weight of the cathode coated on the copper foil was adjusted to 11 mg / cm 2. Further, a separator made of polyethylene (PE) was inserted between the prepared electrodes and inserted into the aluminum pouch. The electrolyte solution was injected thereinto, and the pouch was sealed to prepare a pouch type lithium secondary battery. The electrolytic solution used was one having a concentration of LiPF ₆ 1M at EC (ethylene carbonate) / DMC (dimethyl carbonate) = 1/1 (weight ratio).

[Example 1]

An aluminum foil having a thickness of 20 占 퐉 was used as a conductor for a negative electrode, using the same positive electrode as that of Comparative Example 1. A separator made of polyethylene (PE) was inserted between the anode and the cathode, and the battery assembly was manufactured by pressing. This battery assembly was inserted into an aluminum pouch, and the same electrolyte as in Comparative Example 1 was injected thereinto and sealed to prepare a lithium secondary battery.

Thus, the discharge rate characteristics of the lithium secondary batteries prepared in Comparative Example 1 and Example 1 were compared. At this time, the charging condition of each battery was charged at a constant rate of 1 C-rate under a constant current (CV) / constant current (CV) condition to 4.2 V, and an end current condition was set at 0.2 C. Here, the C-rate is the discharge rate, which can be expressed as the discharge capacity per unit time. The discharge rate was measured at 0.1 C-rate with a discharge capacity of 100%.

[Table 1] Comparison of characteristics according to discharge rate

As shown in Table 1, in the case of the lithium secondary battery using the conventional negative electrode active material as in Comparative Example 1, since the negative electrode active material and the negative electrode current collector are in contact with each other via the binder material, The contact resistance is very large. This contact resistance slows the movement speed of the electrons and lowers the discharge speed of the battery.

On the other hand, in the case of the first embodiment of the present invention, since no negative active material and binder material are used, there is no contact resistance in the negative electrode and electrons move fast during charge and discharge. Therefore, the discharge speed of the battery is greatly improved. From these results, it can be seen that the battery structure of the present invention has an effect of greatly improving the charging / discharging speed of the battery.

Thus, as shown in FIG. 11, it can be seen that the electrochemical energy device having no negative electrode active material of the present invention has an advantage over the electrochemical energy device using the conventional negative electrode active material in high rate discharge. In addition, the heat generation of the battery is reduced thereby improving the energy efficiency, preventing deterioration of the constituent elements of the battery, increasing the life span, and advantageous in terms of heat dissipation and service life of the applied electronic products. The charge-discharge cycle life characteristics of the electrochemical energy device manufactured in Example 1 are shown in Fig. As shown in FIG. 12, even when the number of charging / discharging cycles exceeds 100, it shows stable lifetime characteristics with almost no capacity drop. Since the electrochemical device of the present invention does not have a separately formed negative electrode active material layer, there is no problem of desorption of the negative electrode active material layer from the current collector. Therefore, due to its structural characteristics, .

In addition, the negative electrode conductor 400 may be formed of any one of Al, Sn, Ag, Au, Mg, Zn, an alloy thereof, and SnO _x (0 <x? Preferably, it may be Al, Zn, Sn, or SnO _x .

That is, the negative electrode conductor 400 may be made of any one of Al, Sn, Ag, Au, Mg, Zn, an alloy thereof and SnO _x (0 <x? 2) . The SnO _x may be stoichiometric or non-stoichiometric tin oxide where 0 <X ≤ 2. Thus, the electrochemical energy device of the present invention can be a secondary battery having high energy density and durability. Also, when the negative electrode conductor is made of Al, the capacity per unit volume and the capacity per unit weight may be larger than those of a battery using a conventional negative electrode active material.

An alloy layer 451 is formed on the upper surface of the negative electrode conductor 400 and an alloy layer 451 is disposed between the negative electrode conductor 400 and the electrolyte 300. The alloy layer 451 May be in contact with the electrolyte (300). The alloy layer may be a lithium alloy, and may be in the form of an alloy layer in the form of a film and a particle form or a foam. Here, the alloy layer 451 can be manufactured by a known method.

That is, as shown in FIG. 2, the upper surface of the negative electrode conductor 400 may preferably form a lithium metal and a thin alloy layer, and the thickness of the thin alloy layer 451 may be 1 nm to 10 μm. Since the upper surface of the negative electrode conductor 400 forms an alloy layer with lithium metal, the alloy layer can perform the same function as the negative active material. In the case of the conventional carbon negative active material, the capacity is small, Layer may have the advantage of having a higher capacity than the carbon material. In addition, there is a problem that the conventional metal-based negative electrode active material accumulates stress and accordingly cracks due to volume change when charging and discharging. On the other hand, the alloy layer 451 has a problem that a conductor for a negative electrode It may be advantageous to have a high durability by suppressing the occurrence of cracks inherently.

In addition, surface irregularities 452 may be formed on the upper surface of the negative electrode conductor 400. The surface irregularities can be formed by immersing the negative electrode conductor in a chemical solvent to induce surface corrosion. The surface irregularities can be formed by applying energy such as electron beam or sputtering to the surface of the negative electrode conductor to etch the surface. Also, the surface irregularities can be manufactured by processing into a regular pattern using a lathe processing technique.

That is, as shown in FIG. 3, surface irregularities 452 are formed on the upper surface of the negative electrode conductor 400, so that the surface area of the upper surface of the negative electrode conductor 400 can be widened. At this time, though not shown, the concave valley portion of the surface irregularities 452 may be filled with an electrolyte for transferring ions. Thus, the surface irregularities 452 can enable more efficient charging and discharging.

The unevenness may be 0.1 탆 to 20 탆, and preferably 1 탆 to 10 탆.

The ion conductive coating layer 453 is adhered or adhered to the upper surface of the negative electrode conductor 400 so that an ion conductive coating layer 453 is formed between the negative electrode conductor 400 and the electrolyte 300. [ And the ion conductive coating layer 453 may be in contact with the electrolyte 300.

4, the ion conductive coating layer 453 may be formed to a thickness of about 1 nm to 5 탆 on the upper surface of the cathode conductive material 400, wherein a plurality of voids are formed in the ion conductive coating layer 453 The gap may be filled with an electrolyte solution for transferring ions or may be a coating layer of a material capable of conducting ions from the electrolyte 300 to the anode conductor 400 without any gap.

Cracks in the negative electrode conductor 400 can be prevented by the ion conductive coating layer 453 and the particles that can be dropped in the negative electrode conductor 400 can be caught by repetition of charging and discharging, Since the anode 400 is not in direct contact with the electrolyte 300, a reaction that may occur between the cathode 400 and the electrolyte 300 can be prevented.

At this time, the ion conductive coating layer 453 may be formed of a polymer including Nafion, ionomer, single ion conductor, ion conductive polymer, ion conductive hydrophilic polymer, liquid electrolyte, Lt; / RTI &gt;

Further, a porous film layer may be further included on the upper surface of the negative electrode conductor. The porous film layer serves as a separator for separating the positive electrode and the negative electrode conductor, and the inside of the pore can be filled with an electrolyte to be a transmission path of ions. The porous film may be a porous film or a nonwoven structure film made of polyethylene, polypropylene, polyethylene terephthalate or a combination thereof.

Further, the sealing part 500 includes a partition 510 formed to surround the periphery of the cathode active material 200 and the electrolyte 300; And a junction 520 formed between the barrier 510 and the anode 100 and between the barrier 510 and the anode 400, respectively. . &Lt; / RTI &gt;

That is, as shown in FIG. 5, the sealing part 500 may include a barrier 510 and a bonding part 520, for example. At this time, the barrier ribs 510 may be formed in a ring shape, and the barrier ribs 510 are interposed between the peripheral portion 110 of the positive electrode conductor 100 and the peripheral portion 410 of the negative electrode conductor 400 And the cathode active material 200 and the electrolyte 300 may be surrounded by the partition wall 510 so as to be clogged. The upper surface of the partition wall 510 may be sealed by the bonding portion 520 on the lower surface of the peripheral portion 110 of the positive electrode conductor 100 and the lower surface of the partition wall 510 may be sealed with the negative electrode conductor 400 The sealing portion 520 may be sealed on the upper surface of the circumferential portion 410 of the base plate 410. [ At this time, the bonding portion 520 can be formed in various forms such as an adhesive. The partition 510 is formed of a thermoplastic resin, and the upper surface and the lower surface of the partition 510 melt by heat fusion, Or may be formed of a bonding portion 520 bonded to the conductor 400.

The sealing part 500 may be formed by laminating a laminate film 120 formed on the lower surface of the periphery 110 of the anode conductor 100 and a laminate film 120 formed on the periphery 410 of the conductor 400 for a cathode, Layer 420 may be formed by joining together.

8, a laminate film layer 120 is previously formed on the lower surface of the periphery 110 of the positive electrode conductor 100, and a laminate film 120 is preliminarily laminated on the upper surface of the periphery 410 of the conductor 400 for a negative electrode, The film layer 420 may be formed, and the laminate film layers 120 and 420 may be melted and joined together by thermal fusion, for example, to form the joint portions 121 and 421. In this case, although the bonding portions 121 and 421 are integrally formed as a part of the laminate film layers 120 and 420 are melted and solidified, the laminate film layers 120 and 420 are completely melted and solidified at the time of thermal fusion, So that it can be formed as an integral sealing part 500. Here, the material of the laminated film layer may be composed of polyethylene, polypropylene, a thermoplastic polyolefin, an ethylene vinyl copolymer, an ethylene vinyl acetate copolymer, a polyolefin grafted with maleic anhydride, an ethylene acrylate copolymer, or a combination thereof.

In addition, the electrolyte 300 may be a solid electrolyte 310.

That is, the electrolyte 300 may be formed of a solid electrolyte 310 in a solid state, and may be easily manufactured. Even if the electrochemical energy device of the present invention is bent, the solid electrolyte 310 may be formed of the positive electrode active material 200, It is possible to prevent the conductive member 400 from being directly contacted. At this time, the solid electrolyte 310 may be a polymer electrolyte, for example, and may be formed by impregnating a polymer matrix of a porous structure with an electrolyte. It may also be a gel polymer electrolyte prepared through thermal crosslinking and UV crosslinking. Further, the polymer electrolyte may further include ceramic particles such as alumina, magnesium oxide, titanium oxide, and silica. The ceramic particles may have a size of 10 nm to 50 탆.

In addition, the electrolyte 300 may be an electrolytic solution 320.

6, the electrolyte 300 is formed of a liquid electrolyte 320 so that the electrolyte 320 can completely contact the positive electrode active material 200 and the negative electrode conductor 400, The movement of the ions between the sides can be facilitated.

An electrolyte injection hole 430 penetrating the upper and lower surfaces is formed in the negative electrode conductor 400 and a sealing member 440 for sealing may be coupled to the electrolyte injection hole 430.

That is, in the electrochemical energy device of the present invention, when the electrolyte 300 is formed of the liquid electrolyte 320, the positive electrode active material 200 and the negative electrode active material 400 Is sealed with the sealing part 500 to form an empty space between the positive electrode active material 200 and the negative electrode conductor 400 and then the electrolyte 300 is injected into the empty space to be filled The electrolyte injection hole 430 is formed in the negative electrode conductor 400 and the electrolyte injection hole 430 may be sealed by the sealing member 440 after filling the electrolyte solution 320. At this time, the sealing member 440 is coupled to the electrolyte injection port 430 so that the electrolyte injection hole 430 can be sealed. In addition, the electrolyte injection hole 430 can be sealed in various forms, and the sealing member 440 can be variously .

The cathode active material 200 may be primary particles or secondary particles that are aggregated or sintered. Further, the cathode active material 200 may further include a shell layer coated on the primary particle or secondary particle surface. The shell layer may comprise a metal, an oxide of the metal, a hydroxide, a hydride, a hydrocarbon, or a mixture thereof. The shell layer may have an amorphous, polycrystalline or mixed phase thereof, but the present invention is not limited thereto. The metal of the shell layer may be Mg, Al, Co, K, Na, Ca, Si, Ti, V, Sn, Ge, Ga, B, As, Zr or a mixture thereof. The shell layer may be formed by immersing and dispersing the constituent particles of the shell layer in a dispersion solvent in which the cathode active material is dispersed, or by spray-depositing the dispersion solvent. If necessary, a further process such as calcination or heat treatment may be performed.

In addition, the negative electrode conductor 400 may be formed of any one of Cu, Ni, stainless steel (STS), or an alloy thereof.

In the case where Cu, Ni, stainless steel (STS) or an alloy thereof is used as the negative electrode conductor and the negative electrode active material is not included at the same time, the energy density of the electrochemical energy device including the conventional negative electrode active material can be greatly increased And Cu may be a preferable negative electrode conductor.

When using Cu, Ni, stainless steel (STS) or an alloy thereof as a conductor for a negative electrode, it is preferable to use a conventional Cu, Ni, stainless steel (STS) or an alloy thereof as a collector for a negative electrode, Can exhibit an improved charging capacity and energy density as compared with a conventional electrochemical energy device using a negative electrode, and can be formed into a very thin overall shape, thus enabling a compact configuration. The advantageous effects described above make it possible to use a cathode active material in an electrochemical energy element in which Cu, Ni, stainless steel (STS) or an alloy thereof is used, but not including the anode active material, It has a very important meaning in the field of electrochemical energy devices requiring charge / discharge water and thinner thin type.

[Method of Manufacturing Electrochemical Energy Element Example 1]

7 and 8 are cross-sectional schematic views showing first embodiments of a method for manufacturing an electrochemical energy device having a high energy density of the present invention.

As shown in the figure, the method for manufacturing an electrochemical energy device having a high energy density according to the present invention includes: a step of forming a conductor for a positive electrode 100, a positive electrode active material 200, a solid electrolyte 310, (400) are arranged in order; A step SA20 of forming a laminate by pressing the positive electrode active material 100, the positive electrode active material 200, the solid electrolyte 310 and the negative electrode conductor 400 in the direction in which the contact surfaces are in close contact with each other; And a sealing portion 500 for sealing the periphery of the stacked body is formed by the sealing portion 500. The sealing portion 500 is formed on the peripheral portion 110 of the conductive body 100 for a positive electrode and the peripheral portion 110 of the conductive body 400 for a negative electrode, (110); . &Lt; / RTI &gt;

First, in step SA10, the positive electrode active material 100, the positive active material 200, the solid electrolyte 310 and the negative electrode conductor 400 may be arranged in order.

In step SA20, the positive electrode active material 200, the solid electrolyte 310, and the negative electrode conductor 400 are vertically pressed to bring the contact surfaces into close contact with each other to form a laminate .

In step SA30, the sealing part 500 may be formed to close the periphery of the laminate. The sealing portion 500 is formed to seal between the peripheral portion 110 of the positive electrode conductor 100 and the peripheral portion 110 of the negative electrode conductor 400 so that the positive electrode active material 200, The solid electrolyte 310 may be formed so as to be enclosed by the enclosure 500 so as to surround the periphery of the solid electrolyte 310. Thus, the positive electrode active material 200 and the solid electrolyte 310 can be completely sealed by the positive electrode conductor 100, the negative electrode conductor 400, and the sealing portion 500. Here, the sealing part 500 may be formed by various methods. For example, the sealing part 500 may be formed by applying an adhesive such as a gel or a paste or a sealing material, and then curing the sealing material. Thus, after the sealing part 500 is formed, the positive electrode conductor 100 and the negative electrode conductor 400 are fixed by the sealing part 500 so that the laminate can be maintained in a tight state without being opened in the vertical direction have.

Thus, the structure is simple and the packaging process can be simplified, so that the electrochemical energy device can be easily manufactured.

The solid electrolyte 310 is coated on the lower surface of the cathode active material 200 or on the lower surface of the cathode active material 400 in step SA10. Or may be coated or coated on the upper surface of the substrate.

That is, the cathode active material 200 may be coated on or coated on the lower surface of the anode 100, so that the cathode active material 200 may be integrally formed on the lower surface of the anode 100. At this time, the solid electrolyte 310 is coated or coated on the lower surface of the cathode active material 200 to form the cathode active material 200 on the lower surface of the cathode active material 100 and the solid electrolyte 310 May be formed so that the three components are integrally formed. Or the anode active material 200 is coated or coated on the lower surface of the anode conductive material 100 and the solid electrolyte 310 is coated or coated on the upper surface of the anode conductive material 400 to be integrally formed It is possible.

The laminate film layer 120 formed on the lower surface of the periphery 110 of the anode conductor 100 and the laminate film layer 120 formed on the upper surface of the circumferential portion 410 of the conductor for a cathode 400, The sealing part 500 may be formed by thermally fusing the sealing part 420.

That is, the laminate film layers 120 and 420 may be formed before the step SA10 on the lower surface 110 of the conductor 100 for the positive electrode and the upper surface of the periphery 410 of the conductor 400 for a negative electrode And the sealing part 500 can be formed by thermally fusing using the laminated film layers 120 and 420. At this time, the laminate is pressed and thermally fused by a heating tool on the upper side of the peripheral portion 110 of the positive electrode conductor 100 and the lower side of the peripheral portion 410 of the negative electrode conductor 400 in a state in which the laminate is pressed, After the layers 120 and 420 are melted, the joint portions 121 and 421 formed by solidification may be formed as the sealing portion 500.

The electrochemical device fabricated as described above can be used as a device by itself, and the connection terminal is further connected to the entire anode and the cathode of the electrochemical device to seal the battery in various kinds of pouches A packaging process can be used.

[Method 2 for producing an electrochemical energy device]

9 is a schematic cross-sectional view showing a second embodiment of a method for producing an electrochemical energy device having a high energy density of the present invention.

As shown in the figure, the method of manufacturing an electrochemical energy device having a high energy density according to the present invention includes disposing the positive electrode active material 200 spaced apart from the lower side of a conductor 100 for a positive electrode, And a barrier 510 is formed between the peripheral portion 110 of the positive electrode conductor 100 and the peripheral portion 410 of the negative electrode conductor 400. In this case, (SB10); The positive electrode active material 200 and the negative electrode conductor 400 are separated from each other so that the positive electrode conductor 100 and the barrier rib 510 and the negative electrode conductor 400 and the barrier rib 510 are bonded to each other, SB20 &lt; / RTI &gt; And filling the space between the cathode active material (200) and the anode conductor (400) with an electrolyte (320); . &Lt; / RTI &gt;

Step SB10 is a step of disposing a positive electrode conductor 100 on a lower surface of which a positive electrode active material 200 is formed and disposing a negative electrode conductor 400 on a lower side thereof, The barrier ribs 510 may be interposed between the first electrode 110 and the peripheral portion 410 of the negative electrode conductor 400.

In step SB20, the positive electrode conductor 100 and the barrier rib 510 are bonded with the positive electrode active material 200 and the negative electrode conductor 400 separated from each other to seal the contact surface, The contact surface 510 can be sealed and the contact surface can be sealed. At this time, the thickness of the partition wall 510 in the vertical direction is made thicker than the thickness of the cathode active material 200, so that the cathode active material 200 and the cathode conductive 400 can be separated from each other. The surfaces of the positive electrode conductor 100, the barrier 510 and the negative electrode conductor 400 and the barrier ribs 510 that are in contact with each other can be sealed by forming the connection portion 520 by various methods. Here, the sealing portion 500 may include the partition 510 and the bonding portion 520.

In step SB30, the electrolyte 320 is filled in an empty space surrounded by the cathode active material 200 and the anode conductor 400 and the barrier ribs 510. In this case, the electrolyte solution 320 can be filled in various ways. For example, when the barrier ribs 510 are made of elastic rubber or the like, an electrolyte is injected through the barrier ribs 510 using an injection device such as a syringe, You may. Alternatively, a hole may be formed in the partition 510 or the anode conductor 400, and the electrolyte may be filled in the empty space by sealing the hole after sealing the hole.

Thus, the structure is simple and the packaging process can be simplified, so that the electrochemical energy device can be easily manufactured.

In step SB20, the barrier ribs 510 may be bonded to the positive electrode conductor 100 and the negative electrode conductor 400 by thermal fusion.

That is, the barrier ribs 510 are formed of thermoplastic resin or the like, and the upper surface of the barrier ribs 510 are melted and coagulated at the lower surface of the peripheral portion 110 of the positive electrode conductor 100 by thermal fusion, The lower surface of the partition wall 510 may be melted and solidified to form a welded joint 520 on the lower surface of the peripheral portion 410 of the negative electrode conductor 400 by heat fusion. At this time, the barrier ribs 510 may be thermally welded to the positive electrode conductor 100 and the negative electrode conductor 400 at one time, or may be bonded to one of the positive electrode conductor 100 and the negative electrode conductor 400 After the barrier ribs 510 are fused, they may be fused to the other.

The electrolyte injection hole 430 may be sealed by the sealing member 440 after the electrolyte 320 is filled through the electrolyte injection hole 430 formed in the negative electrode conductor 400 in step SB30 .

That is, the anode 400 may have an electrolyte injection hole 430 formed before the SB10 step. The electrolyte solution 320 may be injected into the hollow space through the electrolyte injection hole 430 to fill the electrolyte solution, 440 to close the electrolyte injection hole 430 to seal.

When the solid electrolyte 310 is used without using the electrolytic solution in the second embodiment of the above-described manufacturing method, the peripheral portion 110 of the conductor for a positive electrode 100 and the conductor for a negative electrode Shaped partition walls 510 are disposed between the peripheral portions 410 of the partition walls 410 and then the cathode active material 200 and the solid electrolyte 310 are closely contacted inside the partition walls 510, The bonding portion 520 may be formed to be adhered to the conductor 100 for a positive electrode and the conductor 400 for a negative electrode by thermal fusion or the like so that the barrier 510 and the bonding portion 520 may be formed of the sealing portion 500 have. Then, after forming the sealing part 500, it is not necessary to fill another electrolyte. The electrochemical device fabricated as described above can be used as a device by itself, and the connection terminal is further connected to the entire anode and the cathode of the electrochemical device to seal the battery in various kinds of pouches A packaging process can be used.

It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims. It goes without saying that various modifications can be made.

1000: Electrochemical energy element
100: positive electrode conductor 110:
120: Laminate film layer 121:
200: cathode active material
300: electrolyte
310: solid electrolyte 320: electrolyte
400: negative electrode conductor 410:
420: laminated film layer 421:
430: electrolyte injection port 440: sealing member
451: alloy layer 452: surface unevenness
453: ion conductive coating layer
500:
510: partition wall 520:

Claims (19)

A positive electrode conductor;
A positive electrode active material comprising lithium oxide laminated on the positive electrode conductor;
A negative electrode conductor disposed so as to face the positive electrode conductor so as to face the positive electrode active material;
An electrolyte interposed between the positive electrode active material and the negative electrode conductor; And
An enclosure formed to surround the periphery of the cathode active material and the electrolyte;
, &Lt; / RTI &gt;
Does not include the negative electrode active material,
The negative electrode conductor is made of Al or Zn,
Wherein an alloy layer formed of a lithium alloy including Al or Zn and lithium is integrated with the metal of the conductor for a negative electrode on the upper surface of the conductor for negative electrode.
delete delete delete delete The method according to claim 1,
Wherein the upper surface of the conductor for negative electrode is formed with surface unevenness.
The method according to claim 1,
And an ion conductive coating layer is formed on the upper surface of the negative electrode conductor.
8. The method of claim 7,
Wherein the ion conductive coating layer comprises:
Wherein the electrolyte is a polymer containing Nafion, an ionomer, a single ion conductor, an ion conductive polymer, an ion conductive hydrophilic polymer, a liquid electrolyte, or a crosslinked body thereof. .
The method according to claim 1,
The sealing portion
A partition wall formed to surround the periphery of the cathode active material and the electrolyte; And
A junction formed between the partition and the anode conductor and between the partition and the cathode conductor, respectively;
And a lithium ion secondary battery.
The method according to claim 1,
Wherein the sealing portion includes a bonding portion formed by bonding a laminate film layer formed on a circumferential bottom surface of a conductor for a positive electrode and a laminate film layer formed on a circumferential portion of a conductor for a negative electrode.
The method according to claim 1,
Wherein the electrolyte is a solid electrolyte.
The method according to claim 1,
Wherein the electrolyte is an electrolytic solution.
13. The method of claim 12,
The negative electrode conductor is provided with an electrolyte injection port passing through the upper and lower surfaces,
And a sealing member for sealing is coupled to the electrolyte injection port. delete delete delete delete delete delete

Images