A kind of cross-linked gel polymer electrolyte and preparation method thereof

A cross-linked gel and polymer technology, which is applied in the field of lithium-ion batteries, can solve the problems of affecting the performance of polymer electrolytes, low porosity and liquid absorption, and hindering battery performance. The effect of high rate and liquid absorption and reduced crystallization

Active Publication Date: 2019-08-23
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, after simple blending, some components of the polymer matrix still have problems such as being easily swollen and deformed; and the commonly used cross-linking method may leave a large amount of monomers, initiators, etc., thereby affecting the performance of the polymer electrolyte
In addition, the current commercially used polyolefin microporous membranes usually use the film pulling method to form pores, and the porosity and liquid absorption rate are low, which hinders the further improvement of battery performance.

Method used

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  • A kind of cross-linked gel polymer electrolyte and preparation method thereof
  • A kind of cross-linked gel polymer electrolyte and preparation method thereof
  • A kind of cross-linked gel polymer electrolyte and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] P.S. 25 -PEO-PS 25 Addition is the preparation of the cross-linked gel polymer electrolyte of 20%, comprises the steps:

[0046] 1) Preparation of Br-PEO-Br macroinitiator:

[0047] Dissolve 8.8g of PEO in 130mL of dichloromethane, stir to dissolve and add 4.64mL of triethylamine (TEA); add 20mL of dichloromethane into another anhydrous and oxygen-free container, and dissolve 4.14mL of BIBB in it; Under the condition of about ℃, slowly add the dichloromethane solution of BIBB into the first container, then raise the temperature to 25~35℃, and stir for 15~20h; after the reaction, filter off the triethylamine bromate formed by triethylamine , and then use saturated sodium bicarbonate (NaHCO 3 ) and water were washed multiple times to remove unreacted BIBB in the system; then add a large amount of Na 2 SO 4 Dry to remove residual moisture in the system; filter out Na 2 SO 4 Finally, a large amount of DCM solvent was removed by evaporation, and then settled in ether ...

Embodiment 2

[0055] P.S. 50 -PEO-PS 50 Addition is the preparation of the cross-linked gel polymer electrolyte of 20%, comprises the steps:

[0056] 1) the preparation of Br-PEO-Br macroinitiator: concrete method is with the step 1) of embodiment 1);

[0057] 2)PS 50 -PEO-PS 50 Preparation of tri-block copolymer: under anhydrous and oxygen-free conditions, add 4g Br-PEO-Br, 0.14g CuBr and 20mL dioxane, stir and dissolve, then add 5.71mL St, then add 0.31mL PMDETA, in Stir at a temperature of 100-120°C for 12-36 hours; after the reaction is completed, dilute the reaction solution with tetrahydrofuran, preferably use a short column of basic alumina to remove copper salts, evaporate a large amount of THF solvent, settle and precipitate in n-hexane, and bake dry get PS 50 -PEO-PS 50 triblock copolymer.

[0058] 3) Preparation of cross-linked gel polymer electrolyte 2:

[0059] Electrospinning: At room temperature, 0.4 g triblock copolymer PS 50 -PEO-PS 50 And 1.6g PVDF was dissolved ...

Embodiment 3

[0063] P.S. 100 -PEO-PS 100 20% PVDF / PS added 100 -PEO-PS 100 The preparation of cross-linked gel polymer electrolyte comprises the steps:

[0064] 1) the preparation of Br-PEO-Br macroinitiator: concrete method is with the step 1) of embodiment 1);

[0065] 2)PS 100 -PEO-PS 100 Preparation of tri-block copolymer: under anhydrous and oxygen-free conditions, add 4g Br-PEO-Br, 0.14g CuBr and 20mL dioxane, stir and dissolve, then add 11.4mL St, then add 0.31mLPMDETA, at 100 Stir at a temperature of ~120°C for 12-36 hours; after the reaction is completed, dilute the reaction solution with tetrahydrofuran, preferably use a short column of basic alumina to remove copper salts, evaporate a large amount of THF solvent, settle and precipitate in n-hexane, and dry get PS 100 -PEO-PS 100 triblock copolymer.

[0066] 3) Preparation of cross-linked gel polymer electrolyte 3:

[0067] Electrospinning: At room temperature, 0.4 g triblock copolymer PS 100 -PEO-PS 100 And 1.6g PVDF...

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Abstract

The invention belongs to the field of lithium ion batteries, and in particular relates to a cross-linked gel polymer electrolyte and a preparation method thereof. The invention provides a cross-linked gel polymer electrolyte, which is obtained after the blended cross-linked polymer film fully absorbs the electrolyte; wherein, the blended cross-linked polymer film is made of a polymer substrate, PS- PEO-PS tri-block copolymer and solvent are firstly prepared by electrospinning, and then cross-linked by Friedel-Crafts reaction; wherein the mass fraction of PS-PEO-PS tri-block copolymer in the blend system is 1 % to 60%, the blending system is a blending system of a polymer substrate and a PS-PEO-PS tri-block copolymer. The polymer electrolyte obtained by the invention has high ion conductivity and other excellent electrochemical properties.

Description

technical field [0001] The invention belongs to the field of lithium ion batteries, and in particular relates to a cross-linked gel polymer electrolyte and a preparation method thereof. Background technique [0002] Traditional lithium-ion batteries are mainly composed of positive electrodes, negative electrodes, separators, and electrolytes. Among them, the separator is mainly polyolefin microporous membrane, including polypropylene microporous membrane (Polypropylene, PP for short), polyethylene microporous membrane (Polyethylene, PE for short), and PP-PE multilayer composite separator. However, this type of separator usually only plays the role of blocking the positive and negative electrodes and providing ion transmission channels. In a high-temperature environment, this type of diaphragm can automatically close the pores, block ion transport, stop the circuit, and improve safety performance to a certain extent. However, high temperature will also cause serious shrinka...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/0565C08L27/16C08L53/00C08J3/24
CPCC08J3/246C08J2327/16C08J2453/00H01M10/0565H01M2300/0082Y02E60/10
Inventor 任世杰肖琴邓纯张秋静王千岳勇
Owner SICHUAN UNIV
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