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Lithium ion battery binder as well as preparation method and application thereof

A lithium-ion battery and binder technology, applied in the direction of adhesive, secondary battery, battery electrode, etc., can solve the problem of insufficient voltage resistance performance, and achieve the effect of improving effect, high coulombic efficiency, and excellent bonding effect.

Pending Publication Date: 2021-06-25
JIANGHAN UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

SBR latex has excellent elasticity and toughness, but the voltage resistance is not enough, it is generally used as a negative electrode binder together with carboxymethyl cellulose

Method used

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  • Lithium ion battery binder as well as preparation method and application thereof
  • Lithium ion battery binder as well as preparation method and application thereof
  • Lithium ion battery binder as well as preparation method and application thereof

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preparation example Construction

[0048] According to another typical embodiment of the present invention, a method for preparing a lithium ion battery binder is provided, the method comprising:

[0049] S1. Mix 1-49 parts by weight of unsaturated siloxane, 1-49 parts by weight of acrylic monomer and 50-150 parts by weight of N-methylpyrrolidone to obtain a mixed solution of raw materials;

[0050] S2. Add 0.1-0.5 parts by weight of an initiator to the raw material mixture solution to carry out polymerization reaction to obtain a binder.

[0051] As an optional embodiment, adding 0.1-0.5 parts by weight of the initiator to the raw material mixed solution to carry out a polymerization reaction to obtain a binder, specifically includes:

[0052] Adding 0.1-0.5 parts by weight of initiator to the raw material mixed solution, performing polymerization reaction under the protection of nitrogen to obtain the binder, the temperature of the polymerization reaction is 50°C-80°C.

[0053] According to another typical e...

Embodiment 1

[0063] In 100 parts by weight of N-methylpyrrolidone solvent, add 5 parts by weight of vinyltrimethoxysilane first monomer and 45 parts by weight of lithium acrylate second monomer, then add 0.25 parts by weight of initiator diperoxide Benzoyl, under the protection of nitrogen, was subjected to solution copolymerization at a temperature of 50° C. to 80° C. for 2 hours to obtain a viscous colorless and transparent glue solution with a solid content of 30%.

Embodiment 2

[0065] In 150 parts by weight of N-methylpyrrolidone solvent, add 10 parts by weight of vinyltriethoxysilane first monomer and 40 parts by weight of lithium acrylate second monomer, then add 0.3 parts by weight of initiator azo Diisobutyronitrile was subjected to solution copolymerization at a temperature of 50° C. to 80° C. for 2 hours under the protection of nitrogen to obtain a viscous colorless and transparent glue solution with a solid content of 24.7%.

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Abstract

The invention particularly relates to a lithium ion battery binder as well as a preparation method and application thereof, and belongs to the technical field of lithium ion batteries. The lithium ion battery binder comprises the following chemical components in parts by weight: 1-49 parts of unsaturated siloxane, 1-49 parts of propenyl monomer, 50-150 parts of N-methyl pyrrolidone and 0.1-0.5 part of initiator. The lithium ion battery binder contains unsaturated siloxane, wherein a siloxane functional group is hydrolyzed and is subjected to an in-situ chemical reaction with groups on the surfaces of positive and negative electrode materials to generate stable chemical bond connection, so that an excellent bonding effect is achieved.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, and in particular relates to a lithium ion battery binder and a preparation method and application thereof. Background technique [0002] Due to the advantages of high energy density, low cost, no memory effect, long cycle life and no pollution, lithium-ion batteries are widely used in mobile electronic devices, consumer electronics, electric vehicles and smart grid energy storage. Lithium-ion battery consists of four parts: positive electrode, negative electrode, diaphragm and electrolyte. The electrode binder is a functional polymer material that must be used in the process of making positive and negative electrodes. The conductive agent, the current collector, etc. are bonded into a complete whole. [0003] The existing lithium-ion battery binders generally use polyvinylidene fluoride PVDF, carboxymethyl cellulose CMC, styrene-butadiene latex SBR and acrylates. Polyvinylidene f...

Claims

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Application Information

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IPC IPC(8): C09J133/02C09J133/08C09J143/04C09J133/20C08F220/06C08F230/08C08F220/14C08F220/56C08F220/44C08F220/18H01M4/62H01M4/134H01M4/133H01M4/131H01M10/0525
CPCC09J143/04C08F220/06C08F220/14C08F230/085C08F220/44C08F220/1802H01M4/622H01M4/134H01M4/133H01M4/131H01M10/0525C08F220/56Y02E60/10
Inventor 刘志宏刘书剑高淑豫刘继延刘学清尤庆亮郑云程鑫柴敬超
Owner JIANGHAN UNIVERSITY
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