WO2013048048A2 - 리튬 이차전지용 양극 활물질, 그의 제조방법 및 그를 포함하는 리튬이차전지 - Google Patents
리튬 이차전지용 양극 활물질, 그의 제조방법 및 그를 포함하는 리튬이차전지 Download PDFInfo
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- WO2013048048A2 WO2013048048A2 PCT/KR2012/007457 KR2012007457W WO2013048048A2 WO 2013048048 A2 WO2013048048 A2 WO 2013048048A2 KR 2012007457 W KR2012007457 W KR 2012007457W WO 2013048048 A2 WO2013048048 A2 WO 2013048048A2
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- C01G53/00—Compounds of nickel
- C01G53/40—Nickelates
- C01G53/42—Nickelates containing alkali metals, e.g. LiNiO2
- C01G53/44—Nickelates containing alkali metals, e.g. LiNiO2 containing manganese
- C01G53/50—Nickelates containing alkali metals, e.g. LiNiO2 containing manganese of the type [MnO2]n-, e.g. Li(NixMn1-x)O2, Li(MyNixMn1-x-y)O2
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- H01M4/1391—Processes of manufacture of electrodes based on mixed oxides or hydroxides, or on mixtures of oxides or hydroxides, e.g. LiCoOx
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- H01M4/38—Selection of substances as active materials, active masses, active liquids of elements or alloys
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- H01M4/50—Selection of substances as active materials, active masses, active liquids of inorganic oxides or hydroxides of manganese
- H01M4/505—Selection of substances as active materials, active masses, active liquids of inorganic oxides or hydroxides of manganese of mixed oxides or hydroxides containing manganese for inserting or intercalating light metals, e.g. LiMn2O4 or LiMn2OxFy
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- H01M4/52—Selection of substances as active materials, active masses, active liquids of inorganic oxides or hydroxides of nickel, cobalt or iron
- H01M4/525—Selection of substances as active materials, active masses, active liquids of inorganic oxides or hydroxides of nickel, cobalt or iron of mixed oxides or hydroxides containing iron, cobalt or nickel for inserting or intercalating light metals, e.g. LiNiO2, LiCoO2 or LiCoOxFy
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- H01M4/58—Selection of substances as active materials, active masses, active liquids of inorganic compounds other than oxides or hydroxides, e.g. sulfides, selenides, tellurides, halogenides or LiCoFy; of polyanionic structures, e.g. phosphates, silicates or borates
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- C01P2002/80—Crystal-structural characteristics defined by measured data other than those specified in group C01P2002/70
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- H01M10/0525—Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
Definitions
- a method of manufacturing a cathode active material for a lithium secondary battery and a lithium secondary battery comprising the same
- the present invention relates to a positive electrode active material for a lithium secondary battery, a manufacturing method thereof, and a lithium secondary battery including the same.
- the lithium secondary battery is a battery that uses carbon such as abyss as a negative electrode active material, uses a metal oxide containing lithium as a positive electrode active material, and uses a nonaqueous solvent as an electrolyte.
- Lithium is a metal with a high tendency to ionize, and thus development of a battery with high energy density and development of high voltage is possible.
- a lithium active metal oxide containing a litop is mainly used as a cathode active material used in a lithium secondary battery, and a layered lithium such as a cobalt-based, nickel-based, and a ternary lithium in which cobalt, nickel, and manganese coexist. More than 90% of transition metal oxides are used.
- the layered reboom transition metal oxide which is widely used as a positive electrode active material, has a limit in energy density because the reversible capacity that can be used is 200 mAhg ⁇ 1 or less. Therefore, as a means to solve the problem of the lithium secondary battery due to the limitation of the reversible capacity of the positive electrode, instead of the general layer-based lithium transition metal oxide, lithium-rich layered oxide (Li thium-r ich layered oxide: 0L0) is being studied.
- the lithium-containing cathode active material for the CVD oxide-rich layer is has a solid solution structure in which U 2 is different from Mn0 3 complexed to an existing layer-phase lithium metal oxide former, when the initial charge to 4.6V, in the Li 2 Mn0 3 Oxygen is desorbed and lithium is extracted to produce a high capacity of 200 mAhg— 1 or more.
- the lithium-rich layered oxide in order for the lithium-rich layered oxide to be electrochemically activated, it is essential to charge the battery at an initial high voltage.
- the lithium-rich composite metal oxide reacts with the electrolyte during the high voltage charging process, degradation occurs. Problem of elution of manganese (Mn) at high temperature and high pressure, A problem occurred.
- the present invention is to provide a cathode active material and a lithium secondary battery including the same by surface-modifying a lithium-rich composite metal oxide, and having excellent life characteristics.
- An embodiment of the present invention provides a cathode active material that suppresses deterioration phenomenon and elution of manganese during layer discharge by suppressing side reaction of the cathode active material and the electrolyte.
- Another embodiment of the present invention provides a novel method for producing the positive electrode active material.
- Another embodiment of the present invention provides a secondary battery using the cathode active material, and has excellent cycle characteristics and a lithium secondary battery having a discharge capacity of 220 mAhg— 1 or more.
- lithium metal composite oxide core represented by the following formula (1); And a coating layer located at an outer surface of the lithium metal composite oxide core and containing a fluorine compound.
- At least one metal selected from the group consisting of Mg, Fe, Cu, Zn, Cr, Ag, Ca, Na, K, In, Ga, Ge, V, Mo, Nb, Si, Ti and Zr.
- the fluorine compound is CsF, KF, LiF, NaF, RbF, TiF, AgF, AgF 2 , BaF 2> CaF 2 ,
- the content of the coating layer is about the total weight of the lithium metal composite oxide core.
- the thickness of the coating layer may be about 5 to about 20 nm.
- the coating layer may further include Zr3 ⁇ 4, Sn0 2 or a mixture thereof.
- the average particle diameter (D50) of the lithium metal composite oxide core may be about 10 to about 20.
- w may be about 1.3 to about 1.5.
- the lithium metal composite oxide core is LiL 3 Ni. 2 Co. 1 Mno. 7 O 2, Lii. 3 Ni. 25 Mno. 75 O 2.
- ⁇ 2i> Another embodiment of the present invention, a) providing a lithium metal complex oxide core represented by the formula (1);
- At least one metal selected from the group consisting of Ag, Ca, Na, K, In, Ga, Ge, V, Mo, Nb, Si, Ti and Zr)
- step B) providing a solution containing a fluorine compound; c) coating the fluorine compound of step b) on the lithium metal composite oxide core of step a); And d) heat-treating the coated lithium metal composite oxide of step c).
- step C) after the solution containing the fluorine compound is coated on the lithium metal composite oxide, the solution may be evaporated at a temperature of about 120 to about 15C C.
- the heat treatment of step d) is about 1 to about 380 at a temperature of about 380 to about 460 ° C.
- the lithium metal composite oxide core may be coated with a thickness of about 5 nm to about 20 nm.
- the solution containing the fluorine compound may further include Zr0 2 , Sn0 2 or a mixture thereof.
- a positive electrode including the positive electrode active material;
- a negative electrode including a negative electrode active material capable of insertion / desorption of lithium ions;
- a separator existing between the anode and the cathode;
- the discharge capacity is SSOmAhg 1 or more.
- the positive electrode active material coated with the lithium metal composite oxide core with a fluorine compound can suppress side reactions between the lithium metal composite oxide and the electrolyte, and suppress the elution and deterioration of manganese.
- a fluorine compound may be uniformly coated on the surface of the lithium metal composite oxide core.
- a lithium secondary battery using the cathode active material for a lithium secondary battery manufactured by the manufacturing method has an excellent lifespan characteristic while achieving a discharge capacity of 220mAhg _1 or more.
- 1 is a flowchart of a method of preparing a coated cathode active material surface-modified with a fluorine compound.
- FIG. 2 illustrates scanning electron microscope (SEM) photographs and energy dispersive spectroscopy (EDS) results of the cathode active material according to the exemplary embodiment of the present invention.
- Figure 3 shows the SEM photograph and EDS analysis results of the positive electrode active material according to a comparative example of the present invention.
- a cathode active material for a lithium secondary battery a manufacturing method thereof, and a lithium secondary battery including the same.
- One embodiment of the present invention is a lithium metal composite oxide core represented by the formula (1); And a coating layer located at an outer surface of the lithium metal composite oxide core and containing a fluorine compound.
- the lithium metal composite oxide core represented by Formula 1 is about 1.2 moles or more and about
- Li 2 Mn0 3 is activated electrochemically, may implement a 220mAhg ⁇ 1 or more discharge capacity.
- the lithium metal composite oxide generates oxygen while having a flat level section in the vicinity of about 4.6 to about 5V during layer charging at a high voltage of 4.6V or higher based on the anode potential.
- the layer deposition method is not particularly limited and may be a method known in the art. ⁇
- the lithium metal composite oxide core may include nickel, cobalt, and manganese, and the molar ratio of nickel, cobalt, and manganese may be appropriately adjusted according to the purpose.
- Manganese may be included in an amount of 0.5 mole or more with respect to metals other than lithium, and improves the structural stability of the lithium metal composite oxide. Some of the manganese may be substituted with other elements to extend the life characteristics. Examples of the metal that may be substituted include transition metals and rare earth metals. For example, Al, Mg, Fe, Cu, Zn, Cr, Ag, Ca, Na, K, In, Ga, Ge, V Mo, It may be at least one metal selected from the group consisting of Nb, Si Ti and Zr.
- the lithium metal composite oxide core may include a) preparing a metal composite aqueous solution by adding a nickel raw material, a cobalt raw material and a manganese raw material to a coprecipitation reactor including an aqueous solution in a desired equivalent ratio; b) controlling the distribution of manganese ions by stirring while maintaining the pH of the solution prepared by adding ammonia water and sodium hydroxide to the metal composite aqueous solution at 10 to 12; c) aging the solution at a predetermined temperature for a predetermined time to obtain a metal composite oxide precursor, which may be prepared by a method for manufacturing a lithium secondary battery precursor.
- nickel raw material for example, nickel sulfate salt nickel nitrate salt, nickel hydrochloride salt, nickel acetate salt and the like can be used.
- cobalt raw material for example, cobalt sulfate salt, cobalt nitrate salt, hydrochloric acid.
- Cobalt salt, cobalt acetate salt, etc. can be used, and manganese sulfate, manganese nitrate salt, manganese hydrochloride, manganese acetate etc. can be used as a manganese raw material.
- the solution is about
- ⁇ 5i> 'a fluorine compound coating the lithium-metal composite oxide cores are CsF, KF, LiF eu
- GdF 3 FeF 3, HoF 3 , InF 3, LaF 3l LuF 3, MnF 3, NdF 3) V0F 3, PrF 3, SbF 3, ScF 3, SmF 3, TbF 3)
- SbF 5 , TaF 5) BiF 5 , MoF 5) ReF 5> SF 5 and WF 5 may be one or more selected from the group consisting of, for example, A1F 3 , BF 3 , ZrF 4, and the like.
- the fluorine compound may be coated on the surface of the lithium metal complex oxide with a thickness of about 5 to about 20 nm, the coating layer, a solution containing a metal salt and fluorine It can be prepared by immersing a lithium metal composite oxide in an aqueous solution of a fluorine compound prepared by mixing a solution containing a system compound or spray-drying the aqueous solution of the fluorine compound to a lithium metal composite oxide, and other well-known coating You can also use the method.
- the thickness of the coating layer is about 5 to about 20 nm, it is possible to obtain an effect of suppressing elution of manganese without lowering the conductivity of the positive electrode active material.
- the thickness of the coating layer is 5 nm or less, the distribution of the left side of the coating layer on the surface becomes relatively low.
- the coating layer is more than 20 nm, it is difficult to pass lithium ions, thereby limiting the output characteristics and limiting the electrochemical activation of the first layer.
- the content of the coating layer is about the total weight of the lithium metal composite oxide core. 0.2 to about 1.5 weight 3 ⁇ 4>.
- the coating layer may further include Zr0 2 , Sn0 2, or a mixture thereof.
- the average particle diameter (D50) of the lithium metal composite oxide core may be about 10 to about 20 GPa.
- D50 average particle diameter of the positive electrode active material
- a positive electrode active material having a uniform particle size distribution, a high sphericity, and a high internal density may be manufactured, which may implement a high discharge capacity in manufacturing a lithium secondary battery.
- w may be 1.3 to 1.5
- the lithium metal composite oxide core may be Li1.3Nio.2Coo.1Mno.7O2, Li1.3Nio.25Mno.75O2, Li1.3Nio.25Coo.05Mno.7O2
- Li1.3Nio.2Coo.1Mno.7O2 Li1.3Nio.25Mno.75O2
- Liu Nio . zCo Alo . osMno It may be one selected from the group consisting of s ⁇ . As such, when lithium is about 1.2 moles, for example, about 1.3 moles or more, it is possible to provide a high capacity positive electrode active material.
- Another embodiment of the present invention provides a method of manufacturing a cathode active material including a lithium metal composite oxide core and a bloso compound coating layer.
- a specific method of manufacturing the positive electrode active material may include the steps of: a) providing a lithium metal composite oxide core represented by Formula 1 below;
- At least one metal selected from the group consisting of Mg, Fe, Cu, Zn, Cr, Ag, Ca, Na, K, In, Ga, Ge, V, Mo, Nb, Si, Ti and Zr)
- step B) providing a solution containing a fluorine compound; c) coating the lithium metal composite oxide core of step a) with a solution containing the fluorine compound of step b); And d) heat-treating the coated lithium metal composite oxide of step c).
- step c) after the solution containing the fluorine compound is coated on the lithium metal composite oxide, the solution may be evaporated at a temperature of about 120 to about 150 ° C.
- the heat treatment of step d) is about 1 to about 380 at a temperature of about 380 to about 460 ° C.
- the lithium metal composite oxide core may be coated with a thickness of about 5 nm to about 20 nm.
- the thickness of the coating layer is about 5 to about 20 ⁇ , it is possible to obtain an effect of suppressing elution of manganese without lowering the conductivity of the positive electrode active material.
- the thickness of the coating layer is about 5 nm or less, the left distribution of the coating layer on the surface is relatively low, and manganese is reduced.
- the coating layer is about 20 nm or more, it is difficult to pass through the gap ions, thereby limiting the output characteristics and limiting the electrochemical activation of the first layer.
- the solution containing the fluorine compound may further include Zr3 ⁇ 4, Sn0 2 or a mixture thereof.
- Another embodiment of the present invention is a positive electrode including a positive electrode active material including a ritop metal composite oxide core represented by Formula 1; and a coating layer containing a fluorine compound on the lithium metal composite oxide core; A negative electrode including a negative electrode active material capable of inserting / detaching lip top; A separator present between the anode and the cathode; And a lithium secondary battery comprising a non-aqueous electrolyte, it provides a lithium secondary battery having a discharge capacity of 220mAhg _1 or more.
- the lithium secondary battery may be in the form of a coin, a burr, a sheet, a cylinder, a square, or the like.
- the retop secondary batteries may be manufactured by a known method, and a detailed description thereof will be omitted.
- manufacture of a positive electrode plate and the structure of a lithium secondary battery are demonstrated easily, it is not limited to these.
- the positive electrode is dissolved in a suitable organic solvent together with at least one additive such as a conductive material, a binder and other additives such as a filler, a dispersant, an ion conductive material, and a pressure enhancer.
- a suitable organic solvent such as a conductive material, a binder and other additives such as a filler, a dispersant, an ion conductive material, and a pressure enhancer.
- a suitable organic solvent such as a conductive material, a binder and other additives such as a filler, a dispersant, an ion conductive material, and a pressure enhancer.
- the positive electrode may include a current collector and a positive electrode active material layer represented by Chemical Formula 2, and may have a coating layer on the surface of the positive electrode active material, or may be used in combination with a compound having the positive electrode active material and the coating layer. It may be.
- the coating layer may be an oxide of Mg, Al, Co, K, Na, Ca, Si, Ti, V, Sn, Ge, Ga, B, As, Zr or a mixture thereof as the coating element compound. ,
- the binder may include polyvinyl alcohol, carboxymethyl cellulose, hydroxypropyl cellulose, diacetyl salose, polyvinyl chloride, carboxylated polyvinyl chloride, polyvinyl fluoride, and ethylene oxide.
- Polymer, polyvinylpyrrolidone, polyurethane, polytetrafluoroethylene, polyvinylidene fluoride, polyethylene, polypropylene, styrene-butadiene rubber, acrylated styrene-butadiene rubber, epoxy resin, nylon, etc. can be used. However, it is not limited thereto.
- the conductive material is used to impart conductivity to the electrode, and any battery can be used as long as it is an electron conductive material without causing chemical change in the battery. Examples thereof include natural alum, artificial graphite, carbon black acetylene black, ketjen black, carbon fiber, metal powder such as copper, nickel, aluminum, silver, metal fiber, and the like, and polyphenylene derivatives.
- the conductive material of can be used 1 type or in mixture of 1 or more types.
- foil such as copper, nickel, stainless steel, aluminum, sheet black carbon fiber, or the like may be used.
- the negative electrode includes a current collector and a negative electrode active material layer formed on the current collector.
- the negative electrode active material two or more kinds of carbons such as graphite capable of reversibly intercalating / deintercalating lithium ions or one or more kinds of black or silver of a composite oxide of transition metals can be used.
- silicon, tin, etc. can also be used as a negative electrode material.
- the negative electrode active material layer also includes a binder, and optionally may further include a conductive material.
- the binder adheres well to the negative electrode active material particles, and also adheres the negative electrode active material to the current collector.
- the binder include polyvinyl alcohol, carboxymethyl salose, hydroxypropyl salose, Polyvinylchloride, carboxylated polyvinylchloride, polyvinylfluoride, polymers containing ethylene oxide, polyvinylpyrrolidone, polyurethane, polytetrafluoroethylene, polyvinylidene fluoride, polyethylene, polypropylene , Styrene-butadiene rubber, acrylated butadiene rubber, epoxy resin, nylon dung may be used, but is not limited thereto.
- the conductive material examples include carbon-based materials such as natural graphite, artificial alum, carbon black, acetylene block, ketjenblec, and carbon fiber; Metal materials such as metal powder or metal fibers such as copper, nickel, aluminum and silver; Conductive polymers of polyphenylene derivatives; Or a conductive material containing a mixture thereof.
- the negative electrode current collector copper foil, nickel foil, stainless steel foil, titanium foil, nickel foam, copper foam, a polymer substrate coated with a conductive metal, or a combination thereof may be used.
- the electrolyte includes a non-aqueous organic solvent and a lithium salt.
- the non-aqueous organic solvent may be a carbonate, ester, ether, ketone, alcohol or aprotic solvent.
- the carbonate solvents include dimethyl carbonate (DMC), diethyl carbonate (DEC), dipropyl carbonate (DPC), methyl propylene carbonate (MPC), ethyl propyl carbonate (EPC), methyl ethyl carbonate (MEC), and ethylene.
- DMC dimethyl carbonate
- DEC diethyl carbonate
- DPC dipropyl carbonate
- MEC methyl propylene carbonate
- EPC ethyl propyl carbonate
- MEC methyl ethyl carbonate
- ethylene ethylene
- the ester solvent may be methyl acetate, ethyl acetate, n-propyl acetate, dimethyl acetate, methyl propionate, ethyl propionate, butyrolactone, decanolide, valerolactone memethionine. Vallonolactone (mevalonolactone), caprolactone (caprolactone) and the like can be used.
- the ether solvent dibutyl ether, tetraglyme diglyme, dimethoxytane, 2-methyltetra hydrofuran, tetrahydrofuran, etc.
- the ketone solvent may be used, such as cyclonucleanone.
- R-CN R is a C2 to C20 linear, branched or cyclic hydrocarbon group, Nitriles such as bond aromatic rings or ether bonds
- amides such as dimethylformamide, dioxolanes such as 1,3-dioxolane, and sulfolanes.
- the non-aqueous organic solvent may be used alone or in combination of one or more, and the mixing ratio in the case of using one or more in combination can be appropriately adjusted according to the desired battery performance, which is It can be widely understood by people.
- Lithium salts dissolved in such a solvent include LiC10 4 , LiBF 4 , LiPF 6> LiAlCl 4 ,
- LiBioCho Lithium Bis (oxalato) borate (LiB0B), lower aliphatic lithium carbonate, chloro borane Lithium, LiN (CF3S02), Li (C 2 F 5 S3 ⁇ 4), LiN (CF 3 S0 2 ) 2 ,
- imides such as LiN (C 2 F 5 S0 2 ) 2 and LiN (CF 3 S0 2 ) (C 4 F 9 S0 2 ).
- LiPF 6 LiPF 6
- carbon tetrachloride, ethylene trifluoride (ethylene), or phosphate containing phosphorus may be included in the electrolyte.
- polyethylene, polypropylene, polyvinylidene fluoride or a multilayer film of two or more layers thereof may be used, and a polyethylene / polypropylene two-layer separator, polyethylene / polypropylene / polyethylene three- layer separator, polypropylene / Mixed multilayer membranes such as polyethylene / polypropylene three layer separators and the like can be used.
- Nickel sulphate, cobalt sulphate and manganese sulphate were added to a coprecipitation reactor containing water at a molar ratio of 0.20: 0.10: 0.70 at a rate of K L / min to prepare a 1 M metal composite aqueous solution.
- the coprecipitation reactor has a cylindrical structure, was used by properly adjusting the diameter and depth of the coprecipitation reactor, while introducing a 1M ammonia water at a rate of 5mL / min into the coprecipitation reactor containing the metal complex aqueous solution, pH controller Sodium hydroxide was added while maintaining the pH at 11.
- the metal complex water solution was stirred at 1000 rpm and aged for 10 hours to prepare a spherical precursor.
- the prepared precursor was washed with ultrapure water of 3C C or more until the pH was 8 or less and dried at 80 ° C for 12 hours. 1.3 equivalent ratios of lithium carbonate were added to the dried coprecipitated spheres and mixed. This was heat-treated in air at 900 ° C. for 10 hours to prepare LiuNi ⁇ Coo Mn ⁇ Oz.
- the mixture was stirred for 10 minutes or more to prepare a uniform mixed solution.
- the obtained mixed solution was spray coated with the Lii.sNio.zCoo.iMno.vOs prepared above, and then heat-treated at 400 ° C. for 5 hours under an inert atmosphere.
- the coating layer coated on the positive electrode active material obtained by the manufacturing method was 10nm in thickness, the content of the coating layer was 0.5% by weight relative to the total amount of the lithium metal composite oxide.
- the average particle size of the prepared positive electrode active material is classified so that the particle size is 25 / iin 90 90% by weight of the positive electrode active material, 5% by weight of acetylene black as a conductive material, 5% by weight polyvinylidene fluoride (PVdF) as a binder % Was dissolved in methylpyrrolidone (NMP, N-Methyl-2-pyrrolidone) to prepare a slurry.
- NMP N-Methyl-2-pyrrolidone
- Lithium metal foil punched to 16 mm in diameter was used as the counter electrode, and a PP film was used as the separator.
- 1M of electrolyte A mixed solution of ethylene carbonate (EC) / dimethyl ether (DME) 1: 1 v / v of LiPF 6 was used.
- EC ethylene carbonate
- DME dimethyl ether
- LiPF 6 LiPF 6
- a positive electrode active material and a secondary battery including the same were prepared in the same manner as in Example 1, except that the content of the coating layer was 1.0 wt% based on the total amount of the lithium metal composite oxide. Comparative Example 1
- Example 1 except for the step of dissolving a lithium metal composite oxide, an aqueous solution containing NH 4 F (Aldrich) in an aqueous solution containing an aluminum salt, stirred for 10 minutes or more and coated with a uniform mixed solution, Using the same method as in Li 1 . 3 Nio. 2 Coo. 1 Mno. 70 2 was prepared, and a secondary battery including the same was prepared. Comparative Example 2
- a positive electrode active material and a secondary battery including the same were prepared by the same method as Example 1, except that the coated lithium metal composite oxide was heat treated with 35 CTC. Comparative Example 3
- a positive active material and a secondary battery including the same were manufactured by the same method as Example 1, except that the coated lithium metal composite oxide was heat-treated at 40C C. Comparative Example 4
- Example 2 Except for the heat treatment of the coated lithium metal composite oxide with 40CTC, Using the same method as in Example 2, a cathode active material and a secondary battery including the same were prepared.
- Example 2 and 3 have a coating layer containing a lithium metal composite oxide as a core and a fluorine compound on its surface.
- the positive electrode active material prepared in Example 1 has a more uniform distribution of elements of A1 and F than the positive electrode active material prepared in Comparative Example 1. From this, in the case of the manufacturing method of Example 1, it can be seen that the coating layer containing the fluorine compound can be more uniformly coated.
- the lithium secondary batteries prepared in Examples 1 and 2 and Comparative Examples 1 to 5 were repeated 30 times of layer discharge. Specifically, the lithium secondary batteries prepared in Examples 1, 2 and Comparative Examples 1 to 5 are charged under a constant current of 25 mA / g until the voltage value becomes 4.6 V under a 60 ° C environment, and then The battery is charged at a constant voltage of 4.6 V until the current value reaches 5 mA / g, and then discharged at a constant current of 25 mA / g until the voltage value reaches 2.0 V. This cycle was repeated between 1, 30 cycles of this cycle, and the capacity retention rate was evaluated. The capacity retention rate was calculated by the following formula.
- Capacity retention rate (3 ⁇ 4) 30 cycles capacity / 1 cycle capacity X 100
- FIG. 5 is a graph showing the cycle characteristics of the positive electrode active material prepared in Example 1, Comparative Example 1 and Comparative Example 2.
- the positive electrode active materials prepared in Examples 1 and 2 were excellent in cycle characteristics compared to the positive electrode active materials prepared in Comparative Examples 2 to 5.
- the capacity retention was 90% or more
- Comparative Examples 2 to 5 had a capacity retention of only about 81 to 853 ⁇ 4>. This is because, according to the manufacturing method of the present application, the fluorine compound is uniformly distributed in the lithium metal composite oxide core. When the coating layer is uniformly coated on the core, side reaction between the lithium-rich layered metal composite oxide and the electrolyte solution is prevented. Cycle characteristics are improved.
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Abstract
Description
Claims
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US14/347,404 US20140242463A1 (en) | 2011-09-26 | 2012-09-18 | Cathode active material for a lithium secondary battery, method for manufacturing same, and lithium secondary battery including same |
EP12834643.4A EP2763218B1 (en) | 2011-09-26 | 2012-09-18 | Cathode active material for a lithium secondary battery, method for manufacturing same, and lithium secondary battery including same |
JP2014533190A JP6251679B2 (ja) | 2011-09-26 | 2012-09-18 | リチウム二次電池用正極活物質、その製造方法及びそれを含むリチウム二次電池 |
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KR10-2011-0097058 | 2011-09-26 | ||
KR1020110097058A KR20130033154A (ko) | 2011-09-26 | 2011-09-26 | 리튬 이차전지용 양극 활물질, 그의 제조방법 및 그를 포함하는 리튬이차전지 |
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WO2013048048A2 true WO2013048048A2 (ko) | 2013-04-04 |
WO2013048048A3 WO2013048048A3 (ko) | 2013-05-23 |
WO2013048048A8 WO2013048048A8 (ko) | 2013-06-13 |
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US (1) | US20140242463A1 (ko) |
EP (1) | EP2763218B1 (ko) |
JP (1) | JP6251679B2 (ko) |
KR (1) | KR20130033154A (ko) |
WO (1) | WO2013048048A2 (ko) |
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Publication number | Publication date |
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WO2013048048A8 (ko) | 2013-06-13 |
US20140242463A1 (en) | 2014-08-28 |
EP2763218A4 (en) | 2015-07-22 |
KR20130033154A (ko) | 2013-04-03 |
EP2763218A2 (en) | 2014-08-06 |
WO2013048048A3 (ko) | 2013-05-23 |
EP2763218B1 (en) | 2016-08-31 |
JP2014531718A (ja) | 2014-11-27 |
JP6251679B2 (ja) | 2017-12-20 |
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