Coating slurry for bonding lithium battery separator and pole piece and preparation method of coating slurry

A lithium battery separator and battery separator technology, which is applied in secondary batteries, battery pack components, circuits, etc., can solve problems such as affecting the rate and cycle performance of lithium ion batteries, blocking the pores of the coating substrate, and reducing ionic conductivity. Achieve the effect of avoiding the influence of the battery rate and cycle performance, the cycle performance is not affected, and the ionic conductivity is improved

Inactive Publication Date: 2016-08-10
HEFEI GUOXUAN HIGH TECH POWER ENERGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For wound-type laminated batteries, the separator and positive electrode sheet need to be glued to achieve effective fixation of the electrode sheet. However, the process of using separator glue is easy to bring additional disadvantages, such as causing closed cells in some areas of the separator As a result, the ionic conductivity of the entire diaphragm is reduced, resulting in a large internal resistance of the battery, which ultimately affects the rate and cycle performance of the lithium-ion battery. Therefore, the microporous structure of the diaphragm is crucial to the electrical performance and safety performance of the battery. To avoid The problem of clogging the pores of the coating substrate caused by the coating of viscous glue, inorganic coating, etc. on the separator or pole piece of the wound laminated battery

Method used

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  • Coating slurry for bonding lithium battery separator and pole piece and preparation method of coating slurry
  • Coating slurry for bonding lithium battery separator and pole piece and preparation method of coating slurry

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] In a 50ml round bottom flask, add 0.1g of ammonium bicarbonate, then add 20ml of deionized water, and form a clear and transparent solution under stirring conditions; add 1g of alumina ceramic dry powder particles in another flask, and then add 100ml of deionized water Ionized water was used for dispersion; the third flask took 0.5g of polyvinylidene fluoride PVDF binder, which was stirred and dispersed in 50ml of organic solvent NMP; after the three were uniformly dispersed, the clear and transparent ammonium bicarbonate solution, The dispersed PVDF glue is added to the flask containing alumina, and the coating slurry is made after the three are fully mixed. Then, the coating slurry is coated on the diaphragm substrate and connected to the pole piece, and then dried at 80° C., so that the diaphragm and the pole piece can be connected, and uniformly distributed pores are formed in the coating.

[0033] Such as figure 1 As shown, the coating slurry is coated on the diap...

Embodiment 2

[0035] In a 50ml round bottom flask, add 0.1g of ammonium carbonate, then add 20ml of deionized water, and form a clear and transparent solution under stirring conditions; add 1g of boehmite dry powder particles to another flask, and then add 100ml of deionized Disperse with water; take 0.5g of carboxymethylcellulose CMC binder in the third flask, stir and disperse it in 50ml deionized water; The good CMC glue is added to the flask containing boehmite, and the coating slurry is made after the three are fully mixed. Then, the coating slurry is coated on the diaphragm substrate and connected to the pole piece, and then dried at 80° C., so that the diaphragm and the pole piece can be connected, and uniformly distributed pores are formed in the coating.

Embodiment 3

[0037] In a 150ml round bottom flask, add 0.1g of ammonium bicarbonate, then add 120ml of deionized water, and form a clear and transparent solution under stirring conditions; add 1g of silica dry powder particles to another flask, and then add 100ml of deionized Water to disperse; take 0.5g polyacrylic acid PAA from the third flask, stir and disperse it in 50ml deionized water; after the three are evenly dispersed, add the clear and transparent ammonium bicarbonate solution and dispersed PAA glue Stir in a flask filled with silicon dioxide, and make a coating slurry after the three are stirred until they are evenly dispersed. Then, the coating slurry is coated on the substrate of the positive electrode plate and bonded to the separator, and then dried at 80° C., so that the connection between the separator and the positive electrode sheet can be realized, and uniformly distributed pores can be formed in the coating.

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Abstract

The invention discloses coating slurry for bonding a lithium battery separator and a pole piece and a preparation method of the coating slurry. The coating slurry coats the lithium battery separator or the pole piece to bond the lithium battery separator and the pole piece, and then is dried; pores are formed in a coating; and the coating slurry is prepared from the following components in parts by weight: 1-10 parts of a pore-forming agent, 1-20 parts of inorganic particles and 3-10 parts of a binder. Uniform distribution of coating pores is achieved through gas release in the high-temperature drying process; and the phenomenon that the slurry blocks a base in the surface coating process of the coating can be effectively avoided, so that the problem that the properties of rate cycle performance and the like are affected due to large internal resistance when the gummed separator or other gummed pole piece is applied to a lithium-ion battery is solved.

Description

[0001] technical field [0002] The invention belongs to the technical field of lithium ion batteries, and in particular relates to a coating material for forming holes in lithium ion batteries and a preparation method thereof. Background technique [0003] Since the commercialization of lithium-ion batteries in the 1990s, they have been widely used in consumer electronics products due to their high voltage, high energy density, long cycle life, and no memory effect. Class pure electric and hybrid electric vehicles, and the demand for production capacity is increasing year by year. [0004] At present, there are two main manufacturing methods of lithium-ion batteries, winding type and laminated type. Both processes have their own advantages and disadvantages. Comparing the two methods in terms of performance: the winding battery has higher internal resistance, less high-rate discharge capacity, and a slightly lower discharge platform. Due to the thickness of the tabs and th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M2/16H01M10/0525H01M50/46
CPCH01M10/0525H01M50/461Y02E60/10
Inventor 王双双臧强李新峰姜雨恒
Owner HEFEI GUOXUAN HIGH TECH POWER ENERGY
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