Composition of binder used for negative electrode of lithium ion secondary battery and preparation method thereof

A binder and microparticle technology, which is applied in the composition and preparation of binders for negative electrodes of lithium-ion secondary batteries, and can solve problems such as the use of difficult water-based slurry, no chemical bonding, and easy expansion.

Active Publication Date: 2018-04-03
NANJING TECH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since the acrylic rubber in the inner layer of the binder is easy to swell in the electrolyte, and there is no chemical bonding between the thermoplastic resin in the outer layer and the polymer in the inner layer, it is difficult to use in water-based slurry

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] Add 39.5 g of deionized water, 1.0 g of 50% sodium dodecyl diphenyl ether disulfonate, 53.0 g of styrene, and 1.5 g of methacrylic acid into a pressure-resistant emulsification container equipped with a stirring paddle and a nitrogen gas inlet valve. g, 1.0g of fumaric acid, 4.5g of glycidyl methacrylate, 0.3g of tert-dodecyl mercaptan, exchanged with nitrogen to remove oxygen, and finally inhaled 40.0g of 1,3-butadiene, stirred to obtain the monomer Mixture lotion.

[0040] Then add deionized exchange water 83.0g, 50% sodium dodecyl diphenyl ether disulfonate 0.4g in the pressure-resistant reactor that stirring paddle, thermometer, nitrogen inlet valve and reflux condenser are housed, then heat up After reaching 70° C., 12 g of 5% ammonium persulfate aqueous solution was added to the reaction kettle, and at the same time, the above-mentioned monomer mixture emulsion was continuously added dropwise for 300 minutes. After the addition is complete, add 6g of 5% ammonium ...

Embodiment 2

[0043] Add 39.5 g of deionized water, 1.0 g of 50% sodium dodecyl diphenyl ether disulfonate, 54.0 g of styrene, and styrene sulfonic acid into a pressure-resistant emulsification container equipped with a stirring paddle and a nitrogen inlet valve. Sodium 1.5, glycidyl methacrylate 1.0 g, tert-dodecyl mercaptan 0.3 g, exchanged with nitrogen to remove oxygen, and finally inhaled 40.0 g of 1,3-butadiene, stirred to obtain a monomer mixture emulsion.

[0044] Then add deionized exchange water 83.0g, 50% sodium dodecyl diphenyl ether disulfonate 0.4g in the pressure-resistant reactor that stirring paddle, thermometer, nitrogen inlet valve and reflux condenser are housed, then heat up After reaching 70° C., 12 g of 5% ammonium persulfate aqueous solution was added to the reaction kettle, and at the same time, the above-mentioned monomer mixture emulsion was continuously added dropwise for 300 minutes. After the addition is complete, add 6 g of 5% ammonium persulfate aqueous solut...

Embodiment 3

[0047] Add 39.5 g of deionized exchange water, 1.0 g of 50% sodium dodecyl diphenyl ether disulfonate, 54.0 g of styrene, and 54.0 g of ethyl vinyl ether into a pressure-resistant emulsification container equipped with a stirring paddle and a nitrogen inlet valve. Ketone 5.0g, 4-hydroxybutyl acrylate glycidyl ether 1.0g, tert-dodecyl mercaptan 0.3g, exchanged with nitrogen to remove oxygen, finally inhaled 1,3-butadiene 40.0g, stirred to obtain monomer Mixture lotion.

[0048] Then add deionized exchange water 83.0g, 50% sodium dodecyl diphenyl ether disulfonate 0.4g in the pressure-resistant reactor that stirring paddle, thermometer, nitrogen inlet valve and reflux condenser are housed, then heat up After reaching 70° C., 12 g of 5% ammonium persulfate aqueous solution was added to the reaction kettle, and at the same time, the above-mentioned monomer mixture emulsion was continuously added dropwise for 300 minutes. After the addition is complete, add 6g of 5% ammonium persu...

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Abstract

The invention relates to a composition of a binder used for a negative electrode of a lithium ion secondary battery and a preparation method thereof. The binder is a polymer microparticle emulsion binder, specifically a dispersion type polymer microparticle emulsion, wherein an emulsion dispersion is polymer microparticles; a dispersion medium is water; the dispersion polymer microparticles is a polymer which has a glass transition temperature of minus 50 to 50 DEG C and is copolymerized from a monomer containing conjugated diene, a monomer containing an aromatic vinyl group and an unsaturatedmonomer containing an epoxy group; and the polymer microparticle emulsion binder has a particle size of 50 to 300 nm, a gel content of 20 to 90% and a pH value of 4.0 to 7.0. The binder provided by the invention can be used for manufacturing of the negative electrode of the lithium ion secondary battery, and has an effect of binding an electrode active material, a conductive agent and a current collector.

Description

technical field [0001] The invention relates to a composition and a preparation method of a binder for the negative electrode of a lithium ion secondary battery. The binder is a polymer particle emulsion binder. Background technique [0002] A lithium-ion secondary battery generally consists of a positive electrode, a negative electrode, a separator, and an electrolyte. The negative electrode is composed of active material, conductive agent, binder, and current collector. Usually, the active material, conductive agent, and binder are mixed into a liquid slurry, coated on the current collector, dried and rolled to make lithium Negative terminal of ion battery. The negative electrode active material is graphite, or carbon with a similar graphite structure, and the electrolytic copper foil with a thickness of 7-20 microns is used as the conductive current collector. The main indicators for evaluating the performance of the binder for the negative electrode of lithium batterie...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F212/08C08F236/10C08F220/06C08F222/02C08F220/32C08F212/14C08F216/36C08F220/58C08F220/56C08F212/32C08F2/26H01M4/62H01M10/0525
CPCH01M4/622H01M10/0525C08F2/26C08F212/08C08F212/32C08F236/10C08F220/06C08F222/02C08F220/325C08F220/585C08F216/16C08F220/56C08F216/36C08F212/14Y02E60/10
Inventor 刘祥黄维
Owner NANJING TECH UNIV
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