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Binder for lithium ion battery and preparation method of binder

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

Active Publication Date: 2021-05-07
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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  • Binder for lithium ion battery and preparation method of binder
  • Binder for lithium ion battery and preparation method of binder
  • Binder for lithium ion battery and preparation method of binder

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

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

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

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

[0031] Among them, R in polyfluoroethylene 1 is C that is not substituted by a substituent 1 straight chain alkyl; R 2 is C that is not substituted by a substituent 2 The carboxylic acid group; R 3 is C that is not substituted by a substitue...

Embodiment 2

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

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

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

[0045] Among them, R in polyfluoroethylene 1 is C that is not substituted by a substituent 4 straight chain alkyl; R 2 is C that is not substituted by a substituent 6 The carboxylic acid group; R 3 is C that is not substituted by a substituent 8 strai...

Embodiment 3

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

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

[0058] The structural unit represented by the polyfluoroethylene formula I accounts for 35% of the polyfluoroethylene mass percentage, the structural unit represented by the formula II accounts for 25% of the polyfluoroethylene mass percentage, and the polyfluoroethylene represented by the formula III The structural units account for 10% by mass of polyvinyl fluoride, and the structural units represented by formula IV account for 30% by mass of polyvinyl fluoride.

[0059] Among them, R in polyfluoroethylene 1 is C that is not substituted by a substituent 3 straight chain alkyl; R 2 is C that is not substituted by a substituent 3 The carboxylic acid group; R 3 is C that is not substituted by a substituent 5 strai...

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Abstract

The invention discloses a binder for a lithium ion battery and a preparation method of the binder. The binder comprises polyvinyl fluoride, carboxymethyl cellulose gel and modified sodium polyacrylate; the carboxymethyl cellulose gel is modified by graphene oxide; and the sodium polyacrylate is modified by carbon nanotubes and sodium dodecyl benzene sulfonate. The binder prepared by the invention has relatively good conductivity and stability; the expansion rate of the binder is very small after the binder is soaked in an electrolyte; the reduction rate of the bonding strength of the binder is small; meanwhile, the assembled battery has relatively good cycle rate capability and cycle life; and the binder can improve the performance of the lithium ion battery on the whole.

Description

technical field [0001] The invention belongs to the technical field of lithium-ion battery materials, and in particular 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 electronic field and become the best choice for electric vehicle power batteries. The demand is growing day by day. Positive electrode materials, negative electrode materials, electrolytes and separators are the key components of lithium-ion batteries. The positive and negative active materials, conductive agents and binders are made into active slurry, and then evenly coated on aluminum foil or copper foil, and then baked, rolled, and sheet-made to form a lithium-ion battery. As one of the important components of the positive and negative electrode materials, the binder is mainly used to ensure the ...

Claims

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Application Information

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Patent Type & Authority Applications(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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