A kind of biomass modified polymer binder, its preparation method and its application in silicon-based electrode lithium-ion battery

A polymer and binder technology, applied in battery electrodes, secondary batteries, circuits, etc., can solve problems such as lack of practical application ability, achieve stable structure, good electrochemical performance, and overcome the effect of volume expansion

Active Publication Date: 2022-02-18
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, polyvinylidene fluoride only relies on the van der Waals force for bonding, and it does not have practical application capabilities for silicon-based electrodes with large volume expansion.

Method used

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  • A kind of biomass modified polymer binder, its preparation method and its application in silicon-based electrode lithium-ion battery
  • A kind of biomass modified polymer binder, its preparation method and its application in silicon-based electrode lithium-ion battery
  • A kind of biomass modified polymer binder, its preparation method and its application in silicon-based electrode lithium-ion battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Example 1 Preparation of silicon-based electrode lithium ion battery binder and electrode coating.

[0027] Add 100g of water and 11g of cornstarch into a 250ml three-neck flask, mechanically stir at 89°C for 10min, then add 0.275g of ammonium persulfate and continue stirring for 30min, then add 0.044g of ferrous sulfate, adjust the temperature to 85°C and stir well After 10 minutes, 2.25 g of hydrogen peroxide with a mass fraction of 30% was added. Then, 10 g of acrylic acid and 24 g of butyl acrylate were gradually added dropwise, and the dropwise addition was completed within 1 hour. After the dropwise addition, the reaction was continued for 2 hours to obtain the water-based polymer product P1.

[0028] Add silicon powder: super P: P1: sodium alginate = 6:2:1:1 into the mortar by grinding and blending, and use the preparation device to coat the resulting slurry on the copper foil, and the copper foil Dry in an oven at 60°C for 24 hours, then dry in an oven at 180°C...

Embodiment 2

[0029] Example 2 Preparation of silicon-based electrode lithium ion battery binder and electrode coating.

[0030] Add 40g of water and 3.6g of cornstarch into a 150ml three-neck flask, mechanically stir at 89°C for 10min, then add 0.007g of starch hydrolytic enzyme and continue stirring for 5min, then add 0.014g of ferrous sulfate, adjust the temperature to 85°C and stir thoroughly Mix for 10 minutes, then add 0.75g of 30% hydrogen peroxide. Then 7g of acrylic acid + 10g of water mixed solution was added dropwise, and the dropwise addition was completed within 30 minutes. After the dropwise addition, the reaction was continued for 2 hours to obtain the water-based polymer product P1.

[0031] Add silicon powder: super P: P1: sodium alginate = 6:2:1:1 into the mortar by grinding and blending, and use the preparation device to coat the resulting slurry on the copper foil, and the copper foil Dry in an oven at 60°C for 24 hours, then dry in an oven at 170°C for 1.5 hours, and f...

Embodiment 3

[0032] Example 3 Preparation of silicon-based electrode lithium ion battery binder and electrode coating.

[0033] Add 40g of water and 7g of cornstarch into a 150ml three-necked flask, mechanically stir at 89°C for 10min, then add 0.014g of starch hydrolytic enzyme and continue stirring for 5min, then add 0.02g of ferrous sulfate, adjust the temperature to 85°C and stir well After 10 minutes, 0.25 g of hydrogen peroxide with a mass fraction of 30% was added. Then 7g of acrylic acid + 10g of water + 0.75g of 30% hydrogen peroxide mixed solution was added dropwise, and the dropwise addition was completed within 40 minutes. After the dropwise addition, the reaction was continued for 2 hours to obtain the water-based polymer product P1.

[0034] Add silicon powder: super P: P1: sodium alginate = 6:2:1:1 into the mortar by grinding and blending, and use the preparation device to coat the resulting slurry on the copper foil, and the copper foil Dry in an oven at 60°C for 24 hours,...

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Abstract

The invention discloses a biomass-modified polymer binder, its preparation method and its application in a silicon-based electrode lithium ion battery. The synthesis method of the binder is: a product obtained by hydrolysis of starch It is obtained by polymerizing with acrylic monomers and then reacting with sodium alginate. The binder is mixed with an active material and a conductive agent to form an electrode slurry and then coated to form an electrode, which can be applied to a silicon-based electrode lithium ion battery. The present invention mainly improves the cycle performance of silicon-based electrode lithium-ion batteries by adding a binder, and the prepared battery has a relatively high discharge specific capacity, and has great application prospects in the development field of new-type silicon-based electrode lithium-ion batteries .

Description

technical field [0001] The invention belongs to the field of lithium-ion battery materials, and relates to a biomass-modified polymer binder, a preparation method thereof and an application in silicon-based electrode lithium-ion batteries. Background technique [0002] Lithium-ion batteries have attracted attention for their high energy density, high working voltage, no memory effect, and environmental friendliness. They have been widely used in portable electronic devices such as mobile phones and computers, and are expected to become the energy source of electric vehicles and hybrid vehicles. important commercial value. [0003] The anode materials of current commercialized lithium-ion batteries are graphite and various carbon materials with graphite as precursors. Although the reversible charge and discharge performance of carbon materials is good, their theoretical mass specific capacity is low (372mAh·g -1 ), the charge-discharge performance at high rates is poor, and...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G81/02C08F251/00C08F220/06C08F220/18C08F283/06C08F220/56H01M4/62H01M10/0525
CPCC08G81/02C08F251/00C08F283/065H01M4/622H01M10/0525Y02E60/10
Inventor 张庆华蔡勇杰詹晓力陈丰秋
Owner ZHEJIANG UNIV
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