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Cross-linked network-shaped silicon-carbon negative electrode binder and silicon-carbon negative electrode plate

A cross-network and binder technology, applied in the direction of negative electrodes, battery electrodes, structural parts, etc., can solve the problems of poor bonding performance, poor cycle stability, high internal resistance of batteries, etc., to improve cycle reversibility, stretch The effect of high strength and strong expansion ability

Inactive Publication Date: 2020-12-01
浙江中科玖源新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, the commonly used binders include polyvinylidene fluoride (PVDF), styrene-butadiene rubber, hydroxymethyl cellulose (CMC), polyacrylic acid (PAA), etc. There are some problems when using the above binders, such as Poor bonding performance, difficult ion conduction, high battery internal resistance, poor cycle stability, etc.

Method used

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  • Cross-linked network-shaped silicon-carbon negative electrode binder and silicon-carbon negative electrode plate
  • Cross-linked network-shaped silicon-carbon negative electrode binder and silicon-carbon negative electrode plate
  • Cross-linked network-shaped silicon-carbon negative electrode binder and silicon-carbon negative electrode plate

Examples

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Effect test

Embodiment 1

[0027] A kind of cross-network silicon carbon negative electrode binder, its preparation method comprises the steps:

[0028] S1. Under nitrogen protection, pour 1.128g (6mmol) 2,5-diaminobenzenesulfonic acid, 0.608g (4mmol) 3,5-diaminobenzoic acid, 50mL m-cresol and 0.607g (6mmol) triethylamine Put it into a three-necked flask, heat to 60°C and dissolve all diamine monomers, then cool to room temperature, add 3.22g (10mmol) 3,3',4,4'-benzophenone tetracarboxylic dianhydride to the above solution , stirred at room temperature for 4 hours to obtain a polyamic acid solution with a solid content of 10% by weight; slowly raised the temperature of the polyamic acid solution to 180 ° C, and maintained this temperature for 18 hours, cooled to room temperature, and then washed with a large amount of methanol to obtain a solid precipitate , filter the solid precipitate and pulverize, and dry under vacuum at 100°C to obtain sulfonated polyimide in the form of triethylamine salt; soak th...

Embodiment 2

[0034] A kind of cross-network silicon carbon negative electrode binder, its preparation method comprises the steps:

[0035] S1. Under nitrogen protection, pour 1.128g (6mmol) 2,5-diaminobenzenesulfonic acid, 0.608g (4mmol) 3,5-diaminobenzoic acid, 50mL m-cresol and 0.607g (6mmol) triethylamine Put it into a three-necked flask, heat to 60°C and all the diamine monomers are dissolved, then cool to room temperature, add 3.583g (10mmol) diphenylsulfonetetracarboxylic dianhydride to the above solution, and stir at room temperature for 4 hours to obtain a solid content of It is a 10wt% polyamic acid solution; the polyamic acid solution is slowly heated to 180° C., and maintained at this temperature for 18 hours, cooled to room temperature, and then washed with a large amount of methanol to obtain a solid precipitate, which is filtered and pulverized. Vacuum drying under ℃ obtains the sulfonated polyimide that exists in the form of triethylamine salt; Soak the sulfonated polyimide ...

Embodiment 3

[0040] A cross-linked silicon carbon negative electrode binder whose preparation method is the same as in Example 1, except that in step S1, 3.263g (10mmol) diphenyl sulfide tetracarboxylic dianhydride is used to replace 3.22g (10mmol) 3, 3', 4, 4'-benzophenone tetracarboxylic dianhydride is used as a raw material, and the structural formula of the obtained sulfonated polyimide is

[0041] Wherein, the preparation method of the silicon-carbon negative electrode sheet is the same as that of Example 1, except that the adhesive glue solution described in this embodiment is selected, and the above-mentioned silicon-carbon negative electrode sheet is assembled into a button battery according to the method described in Example 1. Charge and discharge test, the specific test results are shown in Table 1.

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Abstract

The invention provides a cross-linked network-shaped silicon-carbon negative electrode binder and a silicon-carbon negative electrode plate. The binder is obtained by thermal crosslinking of polyimideand polyvinyl alcohol, so that the binder has the advantages of high tensile strength of polyimide and strong capacity of inhibiting expansion of active substances, and can effectively improve the cycle reversibility of the charge-discharge lithium ion battery when being used for a silicon-carbon negative plate.

Description

technical field [0001] The invention relates to the technical field of lithium batteries, in particular to a cross-linked silicon-carbon negative electrode binder and a silicon-carbon negative electrode sheet. Background technique [0002] Lithium-ion batteries have the advantages of greenness, environmental protection, high energy density, and long cycle life. As an advanced energy storage device, they are widely used, especially in the field of new energy vehicles. High-density power batteries are the heart of vehicles. The role is self-evident. Research on lithium batteries is emerging in an endless stream, mainly focusing on improving battery energy density, increasing cycle life, and improving charge and discharge efficiency. At present, the use of silicon negative electrodes instead of graphite negative electrodes has increased the theoretical specific capacity by as much as ten times, but the huge volume change rate of silicon materials can easily cause the pulveriza...

Claims

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Application Information

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IPC IPC(8): H01M4/62H01M4/133H01M4/134H01M10/0525C08J3/24C08L79/08C08L29/04
CPCC08J3/246C08J2379/08C08J2429/04H01M4/133H01M4/134H01M4/622H01M10/0525H01M2004/027Y02E60/10
Inventor 张群李南文许辉祝春才
Owner 浙江中科玖源新材料有限公司
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