A kind of modified styrene-butadiene rubber type negative electrode binder

A technology of styrene-butadiene rubber and binder, applied in structural parts, battery electrodes, secondary battery repair/maintenance, etc., can solve problems such as damage to electrode structure, loss of electrical contact, poor cycle performance, etc., and achieve simple preparation process, The effect of reducing decomposition and reducing consumption

Active Publication Date: 2020-07-17
HEFEI GUOXUAN HIGH TECH POWER ENERGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[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 leads to the loss of electrical contact between the silicon particles and the conductive agent, destroying the entire electrode structure, resulting in capacity attenuation and poor cycle performance

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] A modified styrene butadiene rubber type negative electrode binder, the binder is modified styrene butadiene rubber, and the preparation method of the modified styrene butadiene rubber includes the following steps:

[0038] S1. Mix styrene-butadiene rubber and acrylic acid and irradiate after magnetic stirring to obtain an irradiated product;

[0039] S2. Mix and stir the irradiated product with sodium hydroxide, and obtain modified styrene butadiene rubber after washing.

[0040] The silicon-based negative electrode material prepared from the modified styrene butadiene rubber negative electrode binder includes the following steps:

[0041] S1. The silicon-based / graphite composite material and the conductive agent are mixed and ground to obtain an initial mixture;

[0042] S2. Mix the initial mixture with the thickener solution, stir once, add the binder, and stir twice to obtain a silicon-based negative electrode slurry;

[0043] S3, coating the silicon-based negative electrode s...

Embodiment 2

[0045] A modified styrene butadiene rubber type negative electrode binder, the binder is modified styrene butadiene rubber, and the preparation method of the modified styrene butadiene rubber includes the following steps:

[0046] S1. Mix styrene-butadiene rubber and acrylic acid with magnetic stirring, and irradiate the system after nitrogen and deoxygenation seal to obtain an irradiated product;

[0047] S2. Mix and stir the irradiated product with sodium hydroxide, and obtain modified styrene butadiene rubber after washing;

[0048] Among them, in S1, the styrene-butadiene rubber emulsion and acrylic monomer are mixed and stirred, and the system is irradiated under gamma rays after nitrogen and oxygen removal to obtain an irradiated product;

[0049] The concentration of the styrene-butadiene rubber emulsion is 10wt%;

[0050] In S1, the weight ratio of acrylic acid to styrene butadiene rubber is 1:100;

[0051] In S1, the radiation dose rate is 1.5kGy / h, and the time is 15h;

[0052] ...

Embodiment 3

[0073] A modified styrene butadiene rubber type negative electrode binder, the binder is modified styrene butadiene rubber, and the preparation method of the modified styrene butadiene rubber includes the following steps:

[0074] S1. Mix styrene-butadiene rubber and acrylic acid with magnetic stirring, and irradiate the system after nitrogen and deoxygenation seal to obtain an irradiated product;

[0075] S2. Mix and stir the irradiated product with sodium hydroxide, and obtain modified styrene butadiene rubber after washing;

[0076] Among them, in S1, the styrene-butadiene rubber emulsion and acrylic monomer are mixed and stirred, and the system is irradiated under gamma rays after nitrogen and oxygen removal to obtain an irradiated product;

[0077] The concentration of the styrene-butadiene rubber emulsion is 10wt%;

[0078] In S1, the weight ratio of acrylic acid to styrene butadiene rubber is 1:100;

[0079] In S1, the radiation dose rate is 1.5kGy / h, and the time is 20h;

[0080] ...

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PUM

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Abstract

The invention discloses a modified styrene-butadiene rubber type anode adhesive. The adhesive is characterized by being modified styrene-butadiene rubber. A preparation method of the modified styrene-butadiene rubber comprises the following steps: S1, mixing and stirring styrene-butadiene rubber with acrylic acid, and performing irradiation to obtain an irradiation product; S2, mixing and stirringthe irradiation product with sodium hydroxide, and performing washing to obtain the modified styrene-butadiene rubber. The invention further discloses a silicon-based anode material prepared from themodified styrene-butadiene rubber type anode adhesive and a preparation method of the silicon-based anode material. The anode adhesive can improve the long cycle performance of the anode material andfirst coulombic efficiency of lithium ion batteries.

Description

Technical field [0001] The invention relates to a negative electrode binder, in particular to a modified styrene butadiene rubber type negative electrode binder. Background technique [0002] In recent years, in order to develop high-energy-density rechargeable lithium-ion batteries, a lot of work has been concentrated on silicon-based anode materials. The reason is that silicon has an ultra-high theoretical capacity (4200mAh / g). However, due to the accompanying The large volume effect causes the pulverization of the silicon particles, which in turn causes the loss of electrical contact between the silicon particles and the conductive agent, and destroys the entire electrode structure, resulting in capacity attenuation and poor cycle performance. [0003] The effective way to solve the problem is to find a suitable adhesive. Common adhesives include PAA, CMC / SBR, sodium alginate, chitosan, PI, PAI, etc. Among them, SBR type adhesives are due to It is widely used in low-capacity si...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/62H01M10/42
CPCH01M4/621H01M10/4235Y02E60/10
Inventor 谢李昭王辉谢李生
Owner HEFEI GUOXUAN HIGH TECH POWER ENERGY
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