Utility model content
The main purpose of the utility model is to provide a kind of diaphragm and lithium ion battery, has more good performance.
The utility model proposes a kind of diaphragms, several organic accumulations including base and with caking property and compressibility
Block, stacked organic block interval are set to the single or double of the base.
Further, the compressible ratio of the stacked organic block is 30-99%.
Further, the stacked organic block is set to the base by liquid phase sputtering method by organic polymer.
Further, between the stacked organic block between be divided into 0-500um.
Further, the width of the stacked organic block is 50-300um.
Further, the height of the stacked organic block is 1-20um.
Further, the base is polyethylene porous film layer, polypropylene porous film layer, non-woven fabrics porous membrane layer and polyamides
One of imines film layer is a variety of.
Further, at least one side of the polyethylene porous film layer is equipped with aluminium oxide ceramics particle coating and/or vigorous nurse
Feldspar particle coating;
At least one side of the polypropylene porous film layer is equipped with aluminium oxide ceramics particle coating and/or boehmite ceramic particle
Coating.
Further, the organic polymer is Kynoar, butadiene-styrene rubber, polymethyl acrylate, carboxymethyl cellulose
One of plain sodium and polyacrylic acid a variety of are made.
This also proposes a kind of lithium ion battery with novel, including positive plate, negative electrode tab and above-mentioned diaphragm, the diaphragm
Between the positive plate and the negative electrode tab.
The utility model has the beneficial effects that stacked organic block increases barrier action of the diaphragm between positive/negative plate, subtract
The small probability of positive and negative anodes internal short-circuits;The setting of stacked organic block interval provides better lead to for the circulation and infiltration of electrolyte
Road, and after the setting of stacked organic block interval, the area for covering base will tail off, and be able to maintain the good gas permeability of base;Have
Machine heap block also has compressibility, provides the space that can be rebounded for the expansion of cathode, reduces lithium ion battery deformation
Risk;Stacked organic block has caking property, and positive and negative plate is pasted onto diaphragm both sides, enhances the hard of lithium ion battery ontology
Degree, provides good interface for lithium ion battery charge and discharge cycles process.
Specific embodiment
The following will be combined with the drawings in the embodiments of the present invention, carries out the technical scheme in the embodiment of the utility model
Clearly and completely describing, it is clear that described embodiment is only a part of the embodiment of the utility model, rather than all
Embodiment.Based on the embodiments of the present invention, those of ordinary skill in the art are not making creative work premise
Under every other embodiment obtained, fall within the protection scope of the utility model.
Referring to Fig. 1-2, a kind of diaphragm of an embodiment of the present invention is proposed, including base 2 and there is caking property and can
Several stacked organic blocks 1 of compressibility;The interval of stacked organic block 1 is set to the single or double of base 2.
In the present embodiment, stacked organic block 1 increases barrier action of the diaphragm between positive/negative plate 4, reduces positive and negative
The probability of pole internal short-circuit;The setting of the interval of stacked organic block 1, provides better channel for the circulation and infiltration of electrolyte, and
After the setting of the interval of stacked organic block 1, the area of covering base 2 will tail off, and be able to maintain the good gas permeability of base 2;Stacked organic
Block 1 also has compressibility, provides the space that can be rebounded for the expansion of cathode, reduces the wind of lithium ion battery deformation
Danger;Stacked organic block 1 has caking property, and positive and negative plate 4 is pasted onto diaphragm both sides, enhances the hard of lithium ion battery ontology
Degree, provides good interface for lithium ion battery charge and discharge cycles process.
In the present embodiment, stacked organic block 1 is set to base 2 by liquid phase sputtering method by organic polymer.Conventional liquid
Phase sputtering method can more preferably control the distance between stacked organic block 1 and size, and stacked organic block 1 is made to have better effect.
In the present embodiment, base 2 is polyethylene porous film layer, polypropylene porous film layer, non-woven fabrics porous membrane layer and polyamides
One of imines film layer is a variety of, and when base 2 is that a variety of film layers are made, various film layers are stacked, and between film layer
Lamination order can be arbitrarily arranged.
Further, when base 2 is polyethylene porous film layer or includes polyethylene porous film layer, polyethylene porous film layer
At least one side be equipped with aluminium oxide ceramics particle coating and/or boehmite ceramic particle coating.
When base 2 is polypropylene porous film layer or includes polypropylene porous film layer, polypropylene porous film layer is at least
It is equipped with aluminium oxide ceramics particle coating and/or boehmite ceramic particle coating on one side.
It should be appreciated that aluminium oxide ceramics can be arranged simultaneously in polyethylene porous film layer or the one side of polypropylene porous film layer
Particle coating and boehmite ceramic particle coating, can also be respectively provided with aluminium oxide ceramics particle coating or vigorous nurse on two sides respectively
Aluminium oxide ceramics particle coating and boehmite ceramic particle coating can also be respectively set in feldspar particle coating on two sides.
It is appreciated that other ceramic coatings can also be set on polyethylene porous film layer or polypropylene porous film layer, ceramics
The some or all of surface for being set to polyethylene porous film layer or polypropylene porous film layer of coating.
In the present embodiment, organic polymer is Kynoar, butadiene-styrene rubber, polymethyl acrylate, carboxymethyl cellulose
One of sodium and polyacrylic acid a variety of are made.It should be appreciated that no matter organic polymer is made of how many kinds of material, only need to protect
It demonstrate,proves its sputtering and forms organic accumulation block 1 with caking property and compressibility.
In the present embodiment, the compressible ratio of stacked organic block 1 is preferably set to 30-99%.
In the present embodiment, since stacked organic block 1 has caking property, so being directly bonded to base by common way
On 2.
In the present embodiment, between stacked organic block 1 between be divided into and be preferably provided between 0-500um;Stacked organic block 1
Width is preferably provided in 50-300um;The highly preferable setting of stacked organic block 1 is in 1-20um.
It in the present embodiment, is arranged at intervals between 0-500um between stacked organic block 1, stacked organic block 1 can be greatly reduced
The surface area for covering base 2 controls the surface area that stacked organic block 1 covers base 2 in 5-10%, even if increasing base 2
Stacked organic block 1 will not influence the gas permeability of 2 script of base, hence it is evident that process in being different from the prior art to base 2 surface
Afterwards, the surface area of base 50-100% can be covered in the structure that 2 surface of base is formed, area coverage obviously increases, and makes base 2
Gas permeability increase 20-150% on the basis of the original, and the gas permeability of base 2 obviously increases, and will make lithium ion battery
Performance is decreased obviously.After stacked organic block 1 is arranged, while keeping 2 gas permeability of base, the anti-shape of lithium ion battery is improved
The performances such as change ability, hardness.
In the present embodiment, diaphragm is set between positive plate 3 and negative electrode tab 4, and stacked organic block 1 can only be set to base 2
On one side, for example, being set between positive plate 3 and base 2, and positive plate 3 and base 2 are consolidated using the caking property of stacked organic block 1
It is fixed, for another example, it is set between negative electrode tab 4 and base 2, and consolidated negative electrode tab 4 and base 2 using the caking property of stacked organic block 1
It is fixed, it is set between positive plate 3 and base 2, between negative electrode tab 4 and base 2 simultaneously for another example, and utilize the bonding of stacked organic block 1
Property by positive plate 3 and base 2, fixed, negative electrode tab 4 and base 2 are fixed.
The utility model also proposes a kind of lithium ion battery, including positive plate 3, negative electrode tab 4 and above-mentioned any one every
Film, diaphragm is between positive plate 3 and the negative electrode tab 4;Further include electrolyte, electrolyte infiltrate positive plate 3, negative electrode tab 4 with
And whole interfaces of diaphragm.In the present embodiment, positive plate 3, negative electrode tab 4 can be used conventional material with electrolyte and be made.
In order to which the technical effect of the utility model is better described, the utility model is by preparing specific lithium ion battery sample
Product 1-9 simultaneously tests its partial properties and is illustrated.It should be noted that in lithium ion battery sample 1-9, only stacked organic on diaphragm
The structure of block 1 is different, and without stacked organic block 1, only base 2 in lithium ion battery sample 9.In addition, lithium ion battery sample
Width in product 1-8 between stacked organic block 1 is arbitrarily arranged between 0-500um, and width is arbitrarily arranged between 50-300um.
The following table 1 is that the height of stacked organic block 1 and the specific data in surface density, surface density are that have in lithium ion battery sample 1-8
For machine heap block 1 in the density of 2 one side of base, lithium ion battery sample 7 is to be respectively provided with organic accumulation block 1 on the two sides of base 2,
And the height of the stacked organic block 1 on 2 two sides of base is identical with surface density.The following table 2 is to the diaphragm in lithium ion battery sample 1-9
Carry out the resulting data of permeability test.The following table 3 is different multiplying electric discharge, to the discharge capacity of lithium ion battery sample 1-9 into
Row tests resulting data.The following table 4 is 1000 1C/1C charge and discharge cycles capacity retention ratios to lithium ion battery sample 1-9
And battery core deformation carries out testing resulting data.
Table 1
Battery sample |
Highly (um) |
Surface density (g/m2) |
1 |
1 |
0.4 |
2 |
9 |
0.7 |
3 |
12 |
0.5 |
4 |
10 |
0.65 |
5 |
6 |
1.0 |
6 |
5 |
1.5 |
7 |
9 |
0.7 |
8 |
20 |
1.2 |
Table 2
Battery sample |
Ventilative value s/100ml |
1 |
158 |
2 |
159 |
3 |
156 |
4 |
158 |
5 |
160 |
6 |
162 |
7 |
164 |
8 |
159 |
9 |
157 |
Table 3
Table 4
Battery sample |
Circulation volume conservation rate (%) |
Thickness swelling ratio (%) |
1 |
90.2 |
8.5 |
2 |
91.2 |
7.4 |
3 |
92.3 |
7.8 |
4 |
90.6 |
7.3 |
5 |
85.1 |
8.7 |
6 |
84.7 |
8.2 |
7 |
89.8 |
6.8 |
8 |
88.9 |
7.9 |
9 |
72.2 |
15.1 (being in micro- S type) |
By upper table 2 it is found that organic accumulation block 1 is arranged in base 2 after, compared with being not provided with organic accumulation block 1, base
2 gas permeability does not have significant change.
By upper table 3 it is found that organic accumulation block 1 is arranged in base 2 after, compared with being not provided with organic accumulation block 1, lithium from
Sub- battery is on multiplying power discharging property without significant difference.
By upper table 3 it is found that organic accumulation block 1 is arranged in base 2 after, compared with being not provided with organic accumulation block 1, improve
Lithium ion battery does not influence the interior of lithium ion battery battery during charge and discharge cycles the problem of battery core dilatancy
Resistance, cycle performance are guaranteed.
The above is only the preferred embodiment of the present invention, and therefore it does not limit the scope of the patent of the utility model,
Equivalent structure or equivalent flow shift made by using the description of the utility model and the drawings, is directly or indirectly transported
Used in other related technical areas, it is also included in the patent protection scope of the utility model.