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All-solid-state polymer electrolyte based on zwitterionic liquid modified polyvinyl alcohol and preparation method of all-solid-state polymer electrolyte

An all-solid polymer, zwitterion technology, applied in the manufacture of electrolyte batteries, non-aqueous electrolyte batteries, circuits, etc., can solve the problems of low glass transition temperature, easy leakage, etc., achieve good conductivity, and overcome the effect of difficult molding

Active Publication Date: 2020-08-11
CHANGZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Polyionic liquids (PILs) combine the advantages of ionic liquids and polymers, with high solid-state ionic conductivity and low glass transition temperature, but because ionic liquids are liquids, they still have the disadvantage of easy leakage.

Method used

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  • All-solid-state polymer electrolyte based on zwitterionic liquid modified polyvinyl alcohol and preparation method of all-solid-state polymer electrolyte
  • All-solid-state polymer electrolyte based on zwitterionic liquid modified polyvinyl alcohol and preparation method of all-solid-state polymer electrolyte
  • All-solid-state polymer electrolyte based on zwitterionic liquid modified polyvinyl alcohol and preparation method of all-solid-state polymer electrolyte

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] This embodiment provides an all-solid polymer electrolyte based on amphoteric ionic liquid modified polyvinyl alcohol and its preparation method, the specific steps are as follows:

[0026] (1) Dissolve 4.11g 2-methylimidazole (0.05mol) and 6.11g 1,3-propane sultone (0.05mol) in 60ml acetonitrile, add 1.44g sodium hydride (0.06mol) under nitrogen atmosphere Wherein, react at 40°C for 24 hours to obtain a white precipitate, wash the obtained precipitate with acetonitrile three times, and dry at 60°C to obtain the product imidazolium salt: 3-(2-methylimidazole)-propanesulfonate sodium.

[0027] (2) Add 4.04g of 3-(2-methylimidazole)-propanesulfonate sodium (0.02mol) and 1.85g of epichlorohydrin (0.02mol) to 50ml of dimethyl sulfoxide, under nitrogen atmosphere at 60°C React for 48 hours. Pour the mixed solution into ethyl acetate to precipitate an oily substance, and continue to wash with ethyl acetate for 3 times to obtain a zwitterionic liquid.

[0028] (3) Dissolve 1...

Embodiment 2

[0033] This embodiment provides an all-solid polymer electrolyte based on zwitterionic liquid modified polyvinyl alcohol and its preparation method, which is basically the same as that in Example 1: the difference is that in step (3), the zwitterionic liquid The mass is 3.00g, and the conductivity of the obtained all-solid polymer electrolyte assembled battery at room temperature is 3.16×10 -5 S / cm -1 . In order to test the application of solid-state electrolytes in all-solid-state batteries, it was assembled into LiFePO 4 / SPE / Li batteries were tested for charge-discharge cycles at 60°C. The first discharge specific capacity of the battery measured at 0.1C rate is 188mAh·g -1 .

Embodiment 3

[0035] This example This example provides an all-solid polymer electrolyte based on zwitterionic liquid modified polyvinyl alcohol and its preparation method, which is basically the same as that in Example 1: the difference is that in step (3), the amphoteric The mass of the ionic liquid is 0.50 g. The conductivity of the obtained all-solid polymer electrolyte assembled battery at room temperature was 1.43×10 -6 S / cm -1 . In order to test the application of solid-state electrolytes in all-solid-state batteries, it was assembled into LiFePO 4 / SPE / Li batteries were tested for charge-discharge cycles at 60°C. The first discharge specific capacity of the battery measured at 0.1C rate is 150mAh·g -1 .

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Abstract

The invention belongs to the field of polymer electrolytes, and particularly relates to an all-solid-state polymer electrolyte based on zwitterionic liquid modified polyvinyl alcohol and a preparationmethod of the all-solid-state polymer electrolyte. By adopting a specific structural design and replacing lithium ions on the base membrane, the problem that a traditional base membrane is difficultto form is solved, the electrolyte has good conductivity, particularly zwitterions are formed by combining anions and cations through covalent bonds, the whole molecule is electrically neutral, and electrons cannot migrate when an electric field is applied.

Description

technical field [0001] The invention belongs to the field of polymer electrolytes and relates to a solid electrolyte, in particular to an all-solid polymer electrolyte based on zwitterionic liquid modified polyvinyl alcohol and a preparation method thereof. Background technique [0002] Due to the advantages of high energy density, high power density, high working voltage, and low self-discharge efficiency, lithium batteries have been widely used in portable devices and entered thousands of households, affecting all aspects of people's daily life. Electrolyte is an important part of lithium battery, which plays the role of transferring lithium ions. The electrolyte of commercial lithium batteries is a liquid electrolyte containing organic solvents. These solvents have a low boiling point and are easy to burn and leak, which poses a great safety hazard and seriously affects people's life and production. [0003] Replacing the organic liquid electrolyte with a solid electroly...

Claims

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Application Information

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IPC IPC(8): H01M10/0565H01M10/058H01M10/052H01M10/42C08F8/44C08F8/36C08F16/06
CPCC08F8/44H01M10/052H01M10/0565H01M10/058H01M10/4235C08F8/36C08F16/06Y02E60/10Y02P70/50
Inventor 林本才苏月任玉荣刘旭华朱志婕杨乾晨
Owner CHANGZHOU UNIV
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