A kind of binder for lithium ion battery and preparation method thereof

A lithium-ion battery and binder technology, applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of reducing the compatibility of electrode materials and SEI films, different components, etc., and achieve excellent stability, small expansion rate, The effect of improving stability

Active Publication Date: 2022-06-24
乌海瑞森新能源材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But these binders are different from the composition of the electrolyte (mainly carbonate), reducing the compatibility with electrode materials and SEI films

Method used

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  • A kind of binder for lithium ion battery and preparation method thereof
  • A kind of binder for lithium ion battery and preparation method thereof
  • A kind of binder for lithium ion battery and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] A preparation method of a binder for a lithium ion battery, specifically comprising the following steps:

[0029] The binder includes 45 parts of polyfluoroethylene, 20 parts of carboxymethyl cellulose gel, and 16 parts of modified sodium polyacrylate.

[0030] The structural unit represented by the formula I of the polyfluoroethylene accounts for 30% of the mass of the polyfluoroethylene, and the structural unit represented by the formula II accounts for 30% of the mass of the polyfluoroethylene. The structural unit represented by the formula IV accounts for 10% of the mass of the polyfluoroethylene, and the structural unit represented by the formula IV accounts for 30% of the mass of the polyfluoroethylene.

[0031] Among them, R in polyfluoroethylene 1 is unsubstituted C 1 straight-chain alkyl; R 2 is unsubstituted C 2 carboxylic acid group; R 3 is unsubstituted C 3 straight-chain alkyl; R 4 for C 4 carboxylic acid group; R 5 is unsubstituted C 1 carboxylic...

Embodiment 2

[0042] A preparation method of a binder for a lithium ion battery, specifically comprising the following steps:

[0043] The binder includes 60 parts of polyfluoroethylene, 35 parts of carboxymethyl cellulose gel, and 22 parts of modified sodium polyacrylate.

[0044] The structural unit represented by the formula I of the polyfluoroethylene accounts for 45% of the mass of the polyfluoroethylene, and the structural unit represented by the formula II accounts for 20% of the mass of the polyfluoroethylene. The structural unit represented by the formula IV accounts for 15% of the mass of the polyfluoroethylene, and the structural unit represented by the formula IV accounts for 20% of the mass of the polyfluoroethylene.

[0045] Among them, R in polyfluoroethylene 1 is unsubstituted C 4 straight-chain alkyl; R 2 is unsubstituted C 6 carboxylic acid group; R 3 is unsubstituted C 8 straight-chain alkyl; R 4 for C 8 carboxylic acid group; R 5 is unsubstituted C 8 carboxylic...

Embodiment 3

[0056] A preparation method of a binder for a lithium ion battery, specifically comprising the following steps:

[0057] The binder includes 50 parts of polyfluoroethylene, 25 parts of carboxymethyl cellulose gel, and 18 parts of modified sodium polyacrylate.

[0058] The structural unit represented by the formula I of the polyfluoroethylene accounts for 35% of the mass of the polyfluoroethylene, and the structural unit represented by the formula II accounts for 25% of the mass of the polyfluoroethylene, as shown in the formula III. The structural unit represented by the formula IV accounts for 10% of the mass of the polyfluoroethylene, and the structural unit represented by the formula IV accounts for 30% of the mass of the polyfluoroethylene.

[0059] Among them, R in polyfluoroethylene 1 is unsubstituted C 3 straight-chain alkyl; R 2 is unsubstituted C 3 carboxylic acid group; R 3 is unsubstituted C 5 straight-chain alkyl; R 4 for C 6 carboxylic acid group; R 5 is ...

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Abstract

The invention discloses a binder for lithium-ion batteries and a preparation method thereof, comprising that the binder includes polyfluoroethylene, carboxymethyl cellulose gel, and modified sodium polyacrylate; wherein, carboxymethyl The base cellulose gel was modified by graphene oxide, and sodium polyacrylate was modified by carbon nanotubes and sodium dodecylbenzenesulfonate. The adhesive prepared by the present invention has good electrical conductivity and stability, and its expansion rate is very small after soaking in the electrolyte, and the rate of decrease in bond strength is small, and the assembled battery has better cycle rate performance and Cycle life, the binder can improve the performance of lithium-ion batteries as a whole.

Description

technical field [0001] The invention belongs to the technical field of lithium ion battery materials, and particularly relates to a binder for lithium ion batteries and a preparation method thereof. Background technique [0002] Lithium-ion batteries have many advantages such as large specific capacity, good cycle performance, and small size. They have been widely used in the field of electronics and have become the best choice for electric vehicle power batteries. Demand is growing. The positive electrode material, negative electrode material, electrolyte and separator are the keys to make up the lithium ion battery. The positive and negative electrode active materials, conductive agents and binders are made into active slurry, and then evenly coated on aluminum foil or copper foil, and the lithium ion battery is formed by baking, rolling, tableting and other processes. As one of the important components of the positive and negative electrode materials, the binder is main...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/62H01M10/0525
CPCH01M4/621H01M4/622H01M4/623H01M10/0525Y02E60/10
Inventor 陈云蒋天天
Owner 乌海瑞森新能源材料有限公司
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