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Composite gel polymer electrolyte as well as preparation method and application thereof

A composite gel and polymer technology, applied in the manufacture of electrolyte batteries, non-aqueous electrolyte batteries, electrolyte immobilization/gelation, etc., can solve problems such as low conductivity and poor interface stability

Inactive Publication Date: 2014-10-29
HYB BATTERY +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Based on this, it is necessary to address the problems of low conductivity and poor interface stability with lithium metal in the existing gel polymer electrolytes, and provide a composite gel polymer electrolyte with higher conductivity and better interface stability with lithium metal. electrolyte membrane

Method used

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  • Composite gel polymer electrolyte as well as preparation method and application thereof
  • Composite gel polymer electrolyte as well as preparation method and application thereof
  • Composite gel polymer electrolyte as well as preparation method and application thereof

Examples

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preparation example Construction

[0042] see figure 1 , the preparation method of the composite gel polymer electrolyte of an embodiment, comprises the following steps:

[0043]Step S101: providing a support body, the support body is polyethylene film, polypropylene film, polypropylene-ethylene-propylene three-layer composite membrane or non-woven fabric.

[0044] The support can enhance the mechanical strength of the composite gel polymer electrolyte and provide conditions for industrial production.

[0045] The thickness of the support is preferably 0.015 to 0.030 mm.

[0046] Step S102: Soak the support body in the poly(butyl methacrylate-acrylonitrile) solution for 5-20 minutes, take it out and dry it, and obtain the dried support body.

[0047] The preparation method of the poly(butyl methacrylate-acrylonitrile) solution is: in the atmosphere of the first protective gas, dissolve the poly(butyl methacrylate-acrylonitrile) in the first solvent, and reflux at 30-80°C Stir for 0.5-5 hours to obtain a poly...

Embodiment 1

[0074] Preparation of Composite Gel Polymer Electrolytes

[0075] (1) Dissolve P(BMA-AN) in tetrahydrofuran in a nitrogen atmosphere, reflux and stir at 45°C for 4 hours, and prepare a poly(butyl methacrylate-acrylonitrile) solution with a concentration of 3% by mass;

[0076] (2) In a nitrogen atmosphere, dissolve PVDF in acetone, reflux and stir at 45°C for 4 hours, and prepare a polyvinylidene fluoride solution with a concentration of 3% by mass;

[0077] (3) Use a polypropylene (PP) film with a thickness of 0.015mm as a support, soak the support in the poly(butyl methacrylate-acrylonitrile) solution obtained in step (1), take it out after 10 minutes, Blow drying to obtain the dried support body, then soak the dried support body in the polyvinylidene fluoride solution obtained in step (2), take it out after 10 minutes, and blow dry to obtain a composite gel polymer electrolyte membrane.

[0078] (4) After the composite gel polymer electrolyte membrane was cut to an approp...

Embodiment 2

[0080] Preparation of Composite Gel Polymer Electrolytes

[0081] (1) Dissolve P(BMA-AN) in tetrahydrofuran in a nitrogen atmosphere, reflux and stir at 30°C for 5 hours, and prepare a poly(butyl methacrylate-acrylonitrile) solution with a concentration of 6% by mass;

[0082] (2) In a nitrogen atmosphere, dissolve PVDF in tetrahydrofuran, reflux and stir at 30°C for 5 hours, and prepare a polyvinylidene fluoride solution with a concentration of 6% by mass;

[0083] (3) Use a polyethylene film (PE) with a thickness of 0.020mm as a support, soak the support in the poly(butyl methacrylate-acrylonitrile) solution obtained in step (1), take it out after 5 minutes, Blow drying to obtain the dried support body, then soak the dried support body in the polyvinylidene fluoride solution obtained in step (2), take it out after 5 minutes, and blow dry to obtain a composite gel polymer electrolyte membrane.

[0084] (4) After the composite gel polymer electrolyte membrane was cut to an a...

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Abstract

The invention relates to a composite gel polymer electrolyte. The composite gel polymer electrolyte comprises a composite gel polymer electrolyte membrane and an electrolyte solution adsorbed on the composite gel polymer electrolyte membrane, wherein the composite gel polymer electrolyte membrane comprises a support body, and poly (butyl methacrylate-acrylonitrile) and polyvinylidene fluoride, which are adsorbed in the support body, a polyethylene film, a polypropylene film, a polypropylene-ethylene-propylene three-layer composite diaphragm or a non-woven fabric is adopted as the support body, the electrolyte solution comprises lithium hexafluorophosphate, ethylene carbonate, dimethyl carbonate and methyl ethyl carbonate, the mass ratio of ethylene carbonate to dimethyl carbonate to methyl ethyl carbonate is (0.5-2):(0.5-2):(0.5-2), and the molar concentration of lithium hexafluorophosphate is 0.5-2mol / L. The composite gel polymer electrolyte has good electrolyte adsorptive property and ion transmission property and high electrical conductivity; the electrolyte solution is prepared from components with reasonable ratio so that interface stability of the gel polymer electrolyte and metal lithium is high.

Description

technical field [0001] The invention relates to the field of lithium ion batteries, in particular to a composite gel polymer electrolyte and its preparation method and application. Background technique [0002] Gel polymer electrolyte (GPE) has been deeply explored by researchers for a long time due to the combination of high conductivity of liquid electrolyte and good safety of solid electrolyte. Many polymers have been reported as GPE matrix, such as polyvinylidene fluoride (PVDF), polyacrylonitrile (PAN), polymethyl methacrylate (PMMA), polyethylene oxide (PEO), polyvinyl chloride ( PVC), etc. However, according to the research, it is found that the above matrix still has some defects: (1) Compared with the liquid electrolyte, the conductivity of the gel electrolyte at room temperature is not ideal, (2) the interface stability of the gel electrolyte and the ideal negative electrode material-lithium Not very good, making the gel polymer electrolyte difficult to meet the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M2/16H01M10/056H01M10/0525H01M10/058
CPCH01M10/0525H01M10/0565H01M10/058H01M2300/0085Y02E60/10Y02P70/50
Inventor 孙嫦娟孙娉傅昭谢慧丽廖友好冯岸柏冯洪亮胡清平井明召杨禹超
Owner HYB BATTERY
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