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Preparation method of gel electrolyte and gel electrolyte prepared with preparation method

A gel electrolyte, porous membrane technology, applied in the direction of electrolyte immobilization/gelation, circuits, electrical components, etc., can solve the problems of poor dimensional stability and poor thermal stability of gel electrolytes, and achieve the effect of good thermal stability

Active Publication Date: 2017-05-10
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The object of the present invention is to provide a preparation method of gel electrolyte to solve the problems of poor thermal stability and poor dimensional stability of gel electrolyte

Method used

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  • Preparation method of gel electrolyte and gel electrolyte prepared with preparation method
  • Preparation method of gel electrolyte and gel electrolyte prepared with preparation method
  • Preparation method of gel electrolyte and gel electrolyte prepared with preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0048] in PS 15 -PEO-PS 15 Preparation of cross-linked porous membranes with three-stage copolymers.

[0049] a) In an anhydrous and oxygen-free environment, after mixing 150ml of dichloromethane and 8.8g of polyethylene oxide (Mn=8000g / mol) uniformly, 4.46ml of triethylamine was added thereto and mixed uniformly to obtain first mixture.

[0050] Under an anhydrous and oxygen-free environment, 10 mL of dichloromethane and 4.14 mL of 2-bromoisobutyryl bromide were uniformly mixed to obtain a second mixed solution.

[0051] At the temperature of the ice-water bath, the second mixed solution was added to the first mixed solution to obtain a reaction system, and the reaction system was stirred at 28° C. for 18 hours to obtain the first intermediate. The first intermediate was washed three times with a saturated sodium bicarbonate solution, and then washed three times with deionized water. Add an appropriate amount of anhydrous sodium sulfate to the washed first intermediate to...

Embodiment 2

[0057] in PS 25 -PEO-PS 25 Preparation of cross-linked porous membranes with three-stage copolymers.

[0058] a) In an anhydrous and oxygen-free environment, after mixing 150ml of dichloromethane and 8.8g of polyethylene oxide (Mn=8000g / mol) uniformly, 4.46ml of triethylamine was added thereto and mixed uniformly to obtain first mixture.

[0059] Under an anhydrous and oxygen-free environment, 10 mL of dichloromethane and 4.14 mL of 2-bromoisobutyryl bromide were uniformly mixed to obtain a second mixed solution.

[0060] At the temperature of the ice-water bath, the second mixed solution was added to the first mixed solution to obtain a reaction system, and the reaction system was stirred at a temperature of 30° C. for 16 hours to obtain the first intermediate. The first intermediate was washed three times with a saturated sodium bicarbonate solution, and then washed three times with deionized water. Add an appropriate amount of anhydrous sodium sulfate to the washed firs...

Embodiment 3

[0066] in PS 50 -PEO-PS 50 Preparation of cross-linked porous membranes with three-stage copolymers.

[0067] a) In an anhydrous and oxygen-free environment, after mixing 150ml of dichloromethane and 8.8g of polyethylene oxide (Mn=8000g / mol) uniformly, 4.46ml of triethylamine was added thereto and mixed uniformly to obtain first mixture.

[0068] Under an anhydrous and oxygen-free environment, 10 mL of dichloromethane and 4.14 mL of 2-bromoisobutyryl bromide were uniformly mixed to obtain a second mixed solution.

[0069] At the temperature of the ice-water bath, the second mixed solution was added to the first mixed solution to obtain a reaction system, and the reaction system was stirred at 25° C. for 20 h to obtain the first intermediate. The first intermediate was washed three times with a saturated sodium bicarbonate solution, and then washed three times with deionized water. Add an appropriate amount of anhydrous sodium sulfate to the washed first intermediate to dry...

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Abstract

The invention provides a preparation method of gel electrolyte and the gel electrolyte prepared with the preparation method, and relates to the field of lithium ion batteries. The preparation method of the gel electrolyte comprises the following steps: carrying out free radical polymerization to obtain PS-PEO-PS (polystyrene-homopolyer-polystyrene); blending the PS-PEO-PS with a framework material to obtain a blended porous membrane; carrying out Friedel-Crafts reaction on the blended porous membrane in the presence of a catalyst and a crosslinking agent, so as to obtain a crosslinked porous membrane; enabling the crosslinked porous membrane to absorb electrolyte, and preparing the gel electrolyte. The preparation method is a flexible and efficient crosslinking method, and the crosslinking degree can be conveniently adjusted and controlled through a reaction substrate and reaction conditions, so as to meet different actual requirements.

Description

technical field [0001] The invention relates to the field of lithium ion batteries, and in particular to a method for preparing a gel electrolyte and the gel electrolyte prepared therefrom. Background technique [0002] At present, lithium-ion batteries mainly use separator / electrolyte systems. Among them, the separator is mainly a polyolefin microporous membrane, such as a polypropylene microporous membrane (Polypropylene, PP for short), a polyethylene microporous membrane (Polyethylene, PE for short), and a PP-PE multilayer composite separator. However, polyolefin separators have the disadvantages of poor thermal stability, poor high-temperature dimensional stability, and poor wettability to electrolytes. At the same time, lithium-ion batteries need to introduce a large amount of flammable organic electrolytes when they are used. Due to the existence of the above problems, when lithium-ion batteries are used in abnormal environments such as overcharge and overheating, it ...

Claims

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Application Information

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IPC IPC(8): H01M10/0565H01M10/0525
CPCH01M10/0525H01M10/0565H01M2300/0085Y02E60/10
Inventor 任世杰邓纯肖琴毕煜晗李浩徐雍捷
Owner SICHUAN UNIV
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