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Silicon-containing polymer binder, preparation method and application in silicon-based electrode lithium ion battery thereof

A silicon polymer and binder technology, used in secondary batteries, battery electrodes, circuits, etc., can solve problems such as lack of practical application ability, achieve good electrochemical performance, improve conductivity, and good compatibility Effect

Active Publication Date: 2019-06-18
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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  • Silicon-containing polymer binder, preparation method and application in silicon-based electrode lithium ion battery thereof
  • Silicon-containing polymer binder, preparation method and application in silicon-based electrode lithium ion battery thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Example 1 Preparation of silicon-based electrode lithium ion battery binder and electrode coating.

[0025] Add solvent to a 50ml three-necked flask: 25g of butyl acetate, then add 2.7g of triisopropylsilyl acrylate, 0.5g of acrylic acid, 0.5g of butyl acrylate, and 1.1g of polyethylene glycol methacrylate. The stirrer was stirred, and NaOH was added dropwise to adjust the pH to 7, and then the temperature was raised to 80° C., and 0.01 g of azobisisobutyronitrile was added dropwise at one time. The product was obtained after reacting for 8 hours, and then the product was precipitated twice in n-hexane to obtain a viscous polymer which was then dissolved in 10 g of butyl acetate.

[0026] Add silicon powder: super P: binder = 7:2:1 mass ratio into the mortar and blend for 30 minutes, use the preparation device to coat the resulting slurry on the copper foil, put the copper foil in Dry in an oven at 60°C for 12 hours, then dry in an oven at 120°C for 12 hours, and then ...

Embodiment 2

[0027] Example 2 Preparation of silicon-based electrode lithium ion battery binder.

[0028] Add solvent to a 50ml three-necked flask: 25.3g of dioxane, then add 1.86g of γ-(methacryloyloxy)propyltrimethoxysilane, 0.5g of acrylic acid, 0.5g of methyl methacrylate, polyethylene glycol 2.7 g of diol methacrylate was stirred with a magnetic stirrer to adjust the pH to 7, then the temperature was raised to 75° C., and 0.055 g of dibenzoyl peroxide was slowly added dropwise. The product was obtained after reacting for 8 hours, and the product was precipitated twice in n-hexane after preliminary rotary evaporation and drying to obtain a viscous polymer, which was then dissolved in 10 g of dioxane

[0029] Add the mass ratio of silicon powder: super P: binder = 6:2:2 into the mortar and blend for 25 minutes, use the preparation device to coat the obtained slurry on the copper foil, put the copper foil in Dry in an oven at 120°C for 24 hours, and then slice into battery electrodes. ...

Embodiment 3

[0030] Example 3 Preparation of silicon-based electrode lithium ion battery binder.

[0031] Add solvents to a 50ml three-necked flask: dimethyl sulfoxide 5g, dioxane 15g, then add γ-(methacryloyloxy)propyltrimethoxysilane 3g, acrylic acid 1g, butyl acrylate 0.7g, 0.3 g of diethylene glycol dimethacrylate was stirred with a magnetic stirrer to adjust the pH to 7, then the temperature was raised to 70°C, 0.05 g of dibenzoyl peroxide was slowly added dropwise, and the product was obtained after continuing the reaction for 24 hours. It was then precipitated twice in n-hexane to obtain a viscous polymer, which was then dissolved in 10 g of dimethyl sulfoxide.

[0032] Add silicon powder: graphite: acetylene black: binder = 15:45:20:20 by mass ratio into the mortar, grind and blend for 30 minutes, and use the preparer to coat the resulting slurry on the copper foil. The copper foil was dried in an oven at 120°C for 12 hours, and then sliced ​​into battery electrodes.

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Abstract

The invention discloses a silicon-containing polymer binder, a preparation method and an application in a silicon-based electrode lithium ion battery thereof. The silicon-containing polymer binder isformed by free radical polymerization or anionic polymerization of silica-containing acrylate monomers, acrylic monomers, acrylate monomers, and polyethylene glycol acrylate monomers; and after the prepared binder is mixed with active materials and conductive agents to form electrode paste, coating is conducted to form an electrode, and the electrode can be applied to the silicon-based electrode lithium ion battery. According to the silicon-containing polymer binder, the preparation method and application in the silicon-based electrode lithium ion battery thereof, cycle performance of the silicon-based anode lithium ion battery is improved through addition of the binder, the prepared battery has high discharge specific capacity, and has the great application prospect in the development field of the novel silicon-based anode lithium ion battery.

Description

technical field [0001] The invention belongs to the field of lithium-ion battery materials, and relates to a silicon-containing polymer binder and a preparation method thereof, which are applied to lithium-ion batteries with silicon-based electrodes. 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 i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/62H01M4/134H01M10/0525C08F283/06C08F230/08C08F220/06C08F220/18
CPCY02E60/10
Inventor 张庆华蔡勇杰詹晓力陈丰秋
Owner ZHEJIANG UNIV
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