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Lithium ion battery gel polymer electrolyte, preparation method and application thereof

A technology of lithium-ion batteries and gel polymers, which is applied in secondary batteries, circuits, electrical components, etc., can solve the problems of high cost, low ion conductivity, and difficult industrial production of lithium ions, so as to reduce production costs and prepare The effect of simple process and improved mechanical strength

Inactive Publication Date: 2011-06-22
SOUTH CHINA NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The ionic conductivity of these two disclosed patents (applications) is on the low side, just reaching 10 -3 S.cm -1 , using imported supports, the cost is also high, and it is difficult to apply to the industrial production of lithium ions. Moreover, other electrochemical properties such as electrochemical stability window, mechanical strength, and charge-discharge stability need to be further improved.

Method used

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  • Lithium ion battery gel polymer electrolyte, preparation method and application thereof
  • Lithium ion battery gel polymer electrolyte, preparation method and application thereof
  • Lithium ion battery gel polymer electrolyte, preparation method and application thereof

Examples

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Embodiment 1

[0036]The monomer acrylonitrile (AN) and vinyl acetate (VAc) are mixed according to the molar ratio of 7:3, and the copolymer poly(acrylonitrile-vinyl acetate) is obtained by emulsion polymerization (the polymerization method is the same as that disclosed in Chinese patent CN101353435A) )P(AN-VAc). Dissolve P(AN-VAc) and nanoparticles in the solvent N, N-dimethylformamide at a mass concentration of 2% to obtain a viscous liquid. The addition of nanoparticles is 10% of the polymer mass. After completely dissolving , soak the cheap and easy-to-obtain polyethylene PE non-woven support in the gel liquid, take it out after 20 minutes, and then pass the polymer-coated PE non-woven support film through a large water bath tank filled with deionized water Initiate phase transfer in medium, then dry and remove residual solvent at 100°C to obtain a lithium ion battery gel polymer film supported by a non-woven fabric support, the specific implementation method is as follows figure 1 show...

Embodiment 2

[0038] The monomer acrylonitrile (AN) and vinyl acetate (VAc) were mixed according to the molar ratio of 8:2, and the copolymer poly(acrylonitrile-vinyl acetate) P(AN-VAc) was obtained by emulsion polymerization. P(AN-VAc) and nano-SiO 2 According to the mass concentration of 0.5%, it is dissolved in the solvent acetone to obtain a viscous liquid, nano-SiO 2 The addition amount of the polymer is 5% of the polymer mass. After it is completely dissolved, soak the cheap and easy-to-obtain polyethylene PE non-woven fabric support in the gel liquid, take it out after 10 minutes, and then put the polymer-coated PE non-woven fabric The supported membrane was induced to undergo phase transfer in a large water-bath tank filled with deionized water, followed by drying at 80 °C to remove residual solvent to obtain a lithium-ion battery gel polymer membrane supported by a non-woven support. After the polymer film was cut to an appropriate size, it was placed in a vacuum drying oven at 50...

Embodiment 3

[0040] The monomer acrylonitrile (AN) and vinyl acetate (VAc) were mixed according to the molar ratio of 9:1, and the copolymer poly(acrylonitrile-vinyl acetate) P(AN-VAc) was obtained by emulsion polymerization. P(AN-VAc) and nano-Al 2 o 3 According to the mass concentration of 5%, it is dissolved in the solvent tetrahydrofuran to obtain a viscous liquid, nano-Al 2 o 3 The addition amount of the polymer is 20% of the mass of the polymer. After it is completely dissolved, soak the cheap and easy-to-obtain polyethylene PE non-woven fabric support in the gel liquid, take it out after 18 minutes, and then put the PE non-woven fabric coated with the polymer The cloth-supported membrane was passed through a large water-bath tank filled with deionized water to induce phase transfer, followed by drying at 95 °C to remove residual solvents to obtain a lithium-ion battery gel polymer membrane supported by a non-woven fabric support. After the polymer film was cut to an appropriate s...

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Abstract

The invention discloses a preparation method for a lithium ion battery gel polymer electrolyte. The preparation method comprises the following steps of: polymerizing monomer acrylonitrile and a polyvinyl acetate emulsion to obtain a copolymer; adding the copolymer and nanoparticles into a solvent to obtain gel liquid; soaking a non-woven fabric support body in the gel liquid and taking the soaked non-woven fabric support body out; initiating phase transfer in deionized water; and obtaining a non-woven fabric support body supported lithium ion battery gel polymer electrolyte by drying and soaking. The electrolyte obtained by the preparation method has obviously improved mechanical strength, greatly reduced production cost, and obviously improved ionic conductivity, decomposition voltage, and electrochemical performance such as the charge-discharge cycle performance, the rate performance and the like of an overall battery compared with the electrolyte without a support body. The preparation method has a simple preparation process, short time and high efficiency, is compatible with conventional liquid lithium ion battery preparation equipment, and does not need to redesign a production line.

Description

technical field [0001] The invention relates to the field of lithium-ion batteries, in particular to a gel-state polymer electrolyte for lithium-ion batteries supported by a non-woven fabric support body and a preparation method and application thereof. Background technique [0002] Lithium-ion batteries are widely used in portable energy devices, but their safety issues urgently need to be solved, especially when they are used in power lithium-ion batteries. The safety issue is mainly caused by the liquid electrolyte, which can be solved by using a solid polymer electrolyte. However, the ionic conductivity of solid electrolytes cannot meet the high-current charge and discharge performance of lithium-ion batteries. Gel polymer electrolyte (GPE) combines the advantages of liquid and solid electrolytes, and has an ionic conductivity of 10 at room temperature. -3 S.cm -1 , is considered to be the most suitable method to solve the safety problem of liquid lithium-ion batterie...

Claims

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Application Information

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IPC IPC(8): H01M10/0565
CPCY02E60/12Y02E60/10
Inventor 李小平廖友好饶睦敏李伟善
Owner SOUTH CHINA NORMAL UNIVERSITY
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