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Preparation method of solid polymer electrolyte for lithium ion battery

A solid polymer, lithium-ion battery technology, used in the manufacture of electrolyte batteries, non-aqueous electrolyte batteries, electrolyte immobilization/gelation, etc., can solve problems such as easy leakage, easy combustion, battery explosion, etc., and achieve high mobility , the effect of improving mechanical strength and reducing crystallinity

Inactive Publication Date: 2016-06-01
QILU UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The main problem to be solved by the present invention is to replace the traditional lithium-ion battery electrolyte with a solid polymer electrolyte to solve the problem of battery explosion caused by the electrolyte being volatile, easy to leak and easy to burn

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] (1) Add 6ml of ammonia water and 3ml of tetraethyl orthosilicate into 100ml of ethanol solvent, stir mechanically at room temperature for 12 hours, then centrifuge, wash, and dry to obtain 80-100nm silica nanoparticles;

[0021] (2) Add 0.6g of silica nanoparticles prepared in step (1) to a mixture of ethanol and water (ethanol / water=7:3), then add 1ml of ammonia water and 1ml of vinyltrimethoxysilane, 80 Stirring at ℃ for 48 hours, then centrifuging, washing and drying to obtain vinylated silica nanoparticles;

[0022] (3) Dissolve 1g of lithium hydroxide in 30ml of methanol solvent, then add 3ml of acrylic acid, stir at 25°C for 3 hours, then pour the reaction solution into acetone solvent, the ratio of methanol to acetone is 1:6, and then suction filter, Freeze-dry for 48 hours to obtain lithium acrylate;

[0023] (4) Dissolve 1g of lithium acrylate prepared in step (3) and 0.5g of vinylated silica nanoparticles prepared in step (2) in 15ml of N,N-dimethylformamide,...

Embodiment 2

[0027] (1) Add 6ml of ammonia water and 3ml of tetraethyl orthosilicate into 100ml of ethanol solvent, stir mechanically at room temperature for 12 hours, then centrifuge, wash, and dry to obtain 80-100nm silica nanoparticles;

[0028] (2) Add 0.6g of silica nanoparticles prepared in step (1) to a mixture of ethanol and water (ethanol / water=7:3), then add 1ml of ammonia water and 1ml of vinyltrimethoxysilane, 80 Stirring at ℃ for 48 hours, then centrifuging, washing and drying to obtain vinylated silica nanoparticles;

[0029] (3) Dissolve 1.5g of lithium hydroxide in 30ml of methanol solvent, add 4.5ml of acrylic acid, stir at 25°C for 3 hours, then pour the reaction solution into acetone solvent, the ratio of methanol to acetone is 1:6.5, and then pump Filter and freeze-dry for 48 hours to obtain lithium acrylate;

[0030] (4) 1g of lithium acrylate prepared in step (3) and 0.6g of vinylated silica nanoparticles prepared in step (2) were dissolved in 15ml of N,N-dimethylfor...

Embodiment 3

[0034] (1) Add 6ml of ammonia water and 3ml of tetraethyl orthosilicate into 100ml of ethanol solvent, stir mechanically at room temperature for 12 hours, then centrifuge, wash, and dry to obtain 80-100nm silica nanoparticles;

[0035] (2) Take 1g of silica nanoparticles prepared in step (1) and add them to the mixture of ethanol and water (ethanol / water=7:3), then add 1.5ml of ammonia water and 1.5ml of vinyltrimethoxysilane, Stirring at 80°C for 48 hours, then centrifuging, washing, and drying to obtain vinylated silica nanoparticles;

[0036](3) Dissolve 2g of lithium hydroxide in 30ml of methanol solvent, then add 9.5ml of acrylic acid, stir at 25°C for 3 hours, then pour the reaction solution into acetone solvent, the ratio of methanol to acetone is 1:7, and then filter with suction , freeze-dried for 48 hours to obtain lithium acrylate;

[0037] (4) Dissolve 1g of lithium acrylate prepared in step (3) and 0.5g of vinylated silica nanoparticles prepared in step (2) in 15...

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Abstract

The patent discloses a preparation method of a solid polymer electrolyte for a lithium ion battery. The preparation method comprises the following steps of doping acrylic acid lithium salt grafted on the surfaces of silicon dioxide nanoparticles into a copolymer of polymer matrix methyl methacrylate and polyethylene glycol methacrylic ester. The migration rate of lithium ions in the copolymer electrolyte is high and is approximate to 1, and thus, the electric conductivity of the lithium ions in the copolymer of polymer matrix methyl methacrylate and polyethylene glycol methacrylic ester is higher than that in a traditional polyethylene oxide electrolyte; and moreover, the mechanical strength of a copolymer electrolyte membrane is also higher than that of the traditional polyethylene.

Description

technical field [0001] The invention belongs to the technical field of batteries, in particular to the preparation of solid polymer electrolytes for lithium ion batteries. Background technique [0002] Lithium-ion batteries are widely used in portable electronic devices such as digital cameras, mobile phones, and notebook computers due to their high energy density, large specific capacity, and light weight. Commonly used lithium-ion batteries mostly use electrolytes, and lithium-ion batteries using organic electrolytes gradually expose their shortcomings: because the electrolyte is volatile and leaks, the battery requires special sealing devices and safety valves, and is not suitable for temperatures above 50 °C Working in the environment; because the electrolyte is flammable and explosive, the battery cannot be subjected to destructive operations. In case of fire and violent impact, the battery becomes a dangerous incendiary bomb. Therefore, it has been desired to develop ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/058B82Y30/00B82Y40/00
CPCB82Y30/00B82Y40/00H01M10/058H01M2300/0085Y02E60/10Y02P70/50
Inventor 刘伟良陈立宁刘波任慢慢杨婷婷
Owner QILU UNIV OF TECH
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