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A kind of modified polyacrylic acid type negative electrode binder

A polyacrylic acid type, polyacrylic acid technology, applied in structural parts, battery electrodes, electrical components and other directions, can solve problems such as unfavorable silicon-based negative electrode processing, cycle capacity decay, and electrode fracture, etc., to achieve suitable for large-scale production, Buffer volume expansion effect, improve flexibility effect

Active Publication Date: 2021-01-08
HEFEI GUOXUAN HIGH TECH POWER ENERGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the high rigidity of PAA, the pole piece made is relatively brittle, which is not conducive to the processing of the silicon-based negative pole piece, and too much rigidity is not conducive to eliminating the stress caused by the volume expansion of silicon, which may cause the pole piece to break, resulting in Rapid loss of circulation capacity

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] A modified polyacrylic acid type negative electrode binding agent, described binding agent is modified polyacrylic acid, the preparation method of described modified polyacrylic acid comprises the steps:

[0037] S1. Mix and stir the polyacrylic acid solution and the acrylate monomer, irradiate the system after deoxygenation and sealing, and obtain an irradiated product;

[0038] S2. Mix the irradiated product with hexane to obtain a precipitate, and wash the precipitate to obtain a modified polyacrylic acid.

[0039] The silicon-based negative electrode material prepared by the modified polyacrylic acid type negative electrode binder, its preparation method comprises the following steps:

[0040] S1, mixing and grinding the silicon-based / graphite composite material and the conductive agent to obtain the primary mixture;

[0041] S2. Mix the primary mixture with the solution of the thickener, stir once, add the binder, and stir twice to obtain a silicon-based negative ...

Embodiment 2

[0044] A modified polyacrylic acid type negative electrode binding agent, described binding agent is modified polyacrylic acid, the preparation method of described modified polyacrylic acid comprises the steps:

[0045] S1. Mix and stir the polyacrylic acid solution and the acrylate monomer, irradiate the system after deoxygenation and sealing, and obtain an irradiated product;

[0046] S2, mixing the irradiated product with hexane to obtain a precipitate, and washing the precipitate to obtain a modified polyacrylic acid;

[0047] Wherein, in S1, the polyacrylic acid solution and the acrylate monomer are mixed and stirred, the system is deoxidized and sealed, and placed under gamma rays for irradiation to obtain an irradiation product;

[0048] In S1, the molecular weight of polyacrylic acid is 100,000;

[0049] In S1, the weight ratio of polyacrylic acid to acrylate monomer is 1:0.01;

[0050] In S1, the mass fraction of polyacrylic acid solution is 10wt%;

[0051] In S1, ...

Embodiment 3

[0071] A modified polyacrylic acid type negative electrode binding agent, described binding agent is modified polyacrylic acid, the preparation method of described modified polyacrylic acid comprises the steps:

[0072] S1. Mix and stir the polyacrylic acid solution and the acrylate monomer, irradiate the system after deoxygenation and sealing, and obtain an irradiated product;

[0073] S2, mixing the irradiated product with hexane to obtain a precipitate, and washing the precipitate to obtain a modified polyacrylic acid;

[0074] Wherein, in S1, the polyacrylic acid solution and the acrylate monomer are mixed and stirred, the system is deoxidized and sealed, and placed under gamma rays for irradiation to obtain an irradiation product;

[0075] In S1, the molecular weight of polyacrylic acid is 50000;

[0076] In S1, the weight ratio of polyacrylic acid to acrylate monomer is 1:0.01;

[0077] In S1, the mass fraction of polyacrylic acid solution is 10wt%;

[0078] In S1, th...

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PUM

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Abstract

The invention discloses a modified-poly(acrylic acid)-type negative electrode binder, which is characterized by being modified poly(acrylic acid). The preparation method of modified poly(acrylic acid)comprises: S1, mixing and stirring a polyacrylic acid solution with an acrylate monomer, and performing irradiation to obtain an irradiation product; and S2, mixing the irradiation product with hexane and performing washing to obtain modified poly(acrylic acid). The invention further discloses a silicon-based negative electrode material prepared from the modified-poly(acrylic acid)-type negativeelectrode binder and a preparation method of the silicon-based negative electrode material. The negative electrode binder can improve the circulation performance of the negative electrode material.

Description

technical field [0001] The invention relates to a negative electrode binder, in particular to a modified polyacrylic acid negative electrode binder. Background technique [0002] In recent years, in order to develop rechargeable lithium-ion batteries with high energy density, a lot of work has focused on silicon-based anode materials because of the ultra-high theoretical capacity of silicon (4200mAh / g), but due to the accompanying The large volume effect leads to the pulverization of silicon particles, which in turn leads to the loss of electrical contact between silicon particles and the conductive agent, destroying the entire electrode structure, resulting in capacity attenuation and poor cycle performance. [0003] An effective way to solve the above problem is to find a suitable binder. Common binders include PAA, CMC / SBR, sodium alginate, chitosan, PI, PAI, etc., among which PAA, PVA and sodium alginate The molecular chain of the binder type contains a large number of ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/62
CPCH01M4/622Y02E60/10
Inventor 谢李昭杨立铭谢李生
Owner HEFEI GUOXUAN HIGH TECH POWER ENERGY
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