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Method for preparing polyolefin microporous-film supported gel polymer electrolyte film

A technology of polyolefin microporous film and electrolyte film, applied in chemical instruments and methods, secondary battery parts, synthetic resin layered products, etc., can solve the impact of lithium-ion battery cycle performance and safety performance, mechanical performance decline, Lithium electrode passivation failure and other problems, to achieve the effect of improving electrochemical stability, improving contact performance, and equipment compatibility

Inactive Publication Date: 2007-11-14
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the adsorption of a large amount of liquid electrolyte will also reduce the mechanical properties of the gel polymer electrolyte system, and the electrolyte will easily react with lithium metal, resulting in the passivation failure of the lithium electrode, which will affect the cycle performance and safety performance of the lithium-ion battery.

Method used

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  • Method for preparing polyolefin microporous-film supported gel polymer electrolyte film
  • Method for preparing polyolefin microporous-film supported gel polymer electrolyte film
  • Method for preparing polyolefin microporous-film supported gel polymer electrolyte film

Examples

Experimental program
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Effect test

Embodiment 1

[0019] 1) 3g (0.03mol) of methyl methacrylate and 2.48g (0.01mol) of methacryloxypropyltrimethoxysilane were blended and dissolved in 40ml of toluene solvent, and 0.0384g of benzoyl peroxide was added as After the initiator was stirred until it was completely dissolved, it was reacted with magnetic stirring at 78° C. for 10 hours under a nitrogen atmosphere. After the reaction, it was cooled to room temperature and precipitated with petroleum ether to obtain a methyl methacrylate-methacryloxypropyl trimethoxysilane copolymer, which was then filtered and vacuum-dried at 50° C. for 8 hours.

[0020] 2) Mix 2.08g (0.01mol) of tetraethyl orthosilicate and 0.72g (0.04mol) of deionized water evenly, then add 0.0014g of p-toluenesulfonic acid as a hydrolysis catalyst, perform hydrolysis reaction for 15 minutes with ultrasonic oscillation, and obtain orthosilicon acid hydrolyzate;

[0021] 3) Blend and dissolve 1g of methyl methacrylate-methacryloxypropyl trimethoxysilane copolymer a...

Embodiment 2

[0028] 1) 5g (0.05mol) of methyl methacrylate and 2.48g (0.01mol) of methacryloxypropyltrimethoxysilane were blended and dissolved in 40ml of toluene solvent, and 0.052g of benzoyl peroxide was added as After the initiator was stirred until it was completely dissolved, it was reacted with magnetic stirring at 70° C. for 10 hours under a nitrogen atmosphere. After the reaction, it was cooled to room temperature and precipitated with petroleum ether to obtain a methyl methacrylate-methacryloxypropyl trimethoxysilane copolymer, which was then filtered and vacuum-dried at 50° C. for 8 hours.

[0029] 2) Mix 2.08g (0.01mol) tetraethyl orthosilicate and 0.54g (0.03mol) deionized water evenly, then add 0.0014g p-toluenesulfonic acid as a hydrolysis catalyst, perform hydrolysis reaction for 15 minutes with ultrasonic vibration, and obtain orthosilicon acid hydrolyzate;

[0030] 3) Blend and dissolve 1g of methyl methacrylate-methacryloxypropyl trimethoxysilane copolymer and 0.2g of e...

Embodiment 3

[0035] 1) 10g (0.1mol) of methyl methacrylate and 2.48g (0.01mol) of methacryloxypropyltrimethoxysilane were blended and dissolved in 40ml of toluene solvent, and 0.087g of benzoyl peroxide was added as After the initiator was stirred until it was completely dissolved, it was reacted with magnetic stirring at 80° C. for 10 hours under a nitrogen atmosphere. After the reaction, it was cooled to room temperature and precipitated with petroleum ether to obtain a methyl methacrylate-methacryloxypropyl trimethoxysilane copolymer, which was then filtered and vacuum-dried at 50° C. for 8 hours.

[0036] 2) with embodiment 1 step 2)

[0037] 3) 1g of methyl methacrylate-methacryloxypropyl trimethoxysilane copolymer and 0.15g of ethyl orthosilicate hydrolyzate were blended and dissolved in 12ml of tetrahydrofuran solvent, and 0.01g of deionized water and 0.01g of p-toluenesulfonic acid, fully stirred, then heated to 50°C for hydrolysis and condensation reaction for 2 hours, to obtain ...

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Abstract

The present invention discloses a preparation method of polyolefin microporous-film-supported gel-polymer electrolyte film; its steps include: methyl methacrylate-methacrylic acyloxy propyl trimethoxy silane polymer is firstly synthesized; after sol-gel reaction, the polymer is directly coated and solidified on polyolefin microporous film, and adsorbs 1M hexafluorophosphate lithium carbonate electrolyte solution to prepare the polyolefin microporous-film-supported gel-polymer electrolyte film. In the system of the film, the polyolefin microporous film takes certain mechanical supporting effect, and has better electrochemical stability; the coated gel-polymer electrolyte not only has a high ionic conductivity, but also well contacts with lithium plate. The ionic conductivity of the film in the present invention can reach 1.2 X10-3S cm-1, and its electrochemical stability window can reach 4.6V. The present invention is simple in preparation process, and suits for industrial production.

Description

technical field [0001] The invention belongs to a preparation method of a gel polymer electrolyte for a polymer lithium ion battery, in particular to a preparation method of a polyolefin membrane-supported gel polymer electrolyte. Background technique [0002] As of 2007, the total annual output of batteries in the world is close to 60 billion, and the annual output of batteries in China is slightly more than half of the global output. my country has become a global battery manufacturing base. For the research of lithium-ion batteries, it is expected to improve its performance and simplify its preparation process, which has become one of the hot spots that researchers pay more attention to. At present, the liquid electrolyte lithium-ion battery separators that have been commercialized mainly use polyolefin microporous membranes such as PE and PP. They have good electrochemical stability and can be charged and discharged hundreds of times without degradation. In addition, in...

Claims

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Application Information

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IPC IPC(8): C08J5/22C08J5/24C08J7/04C08J7/12B32B27/30C08L33/12C08G77/20H01M10/02
CPCY02E60/10
Inventor 李为立李扬杨慕杰
Owner ZHEJIANG UNIV
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