Gel polymer electrolytes and preparation method thereof

Abstract

The present invention relates to a gel polymer electrolyte and the preparation method. The technical characteristics are that the components in terms of weight include 1.0 mol of propylene type polymer with 50 to 75 percent of weight percentage and liquid electrolyte solution with 25 to 50 percent of weight percentage; the components of the propylene type polymer include 17g to 19g of methacrylate methyl ester, 16g to 18g of maleic anhydride, 350mL to 360mL of solvent and 0.0036g to 0.0040g of initiator; wherein, the mol ratio of methacrylate methyl ester and maleic anhydride is 1:1 to 1:1.5. The present invention takes poly(methacrylate methyl ester-maleic anhydride) P(MMA-MAn) as the matrix, thus greatly increasing the film forming and electric conductivity of the gel polymer electrolyte film and achieving the better mechanical performance and the space stability of the system.

Description

technical field [0001] The invention relates to a gel polymer electrolyte and a preparation method thereof. Background technique [0002] Gel polymer electrolyte (GPE) is a polymer network with a suitable microstructure formed by polymers, plasticizers and solvents through a mutual dissolution method, and ionic conduction is realized by using liquid electrolyte molecules fixed in the microstructure. It has the stability, plasticity and dry characteristics of solid polymers, and the high ion conductivity of liquid electrolytes. Therefore, GPE has broad application prospects in electrochemistry as an electrolyte material, especially in the application of potassium batteries. However, adding plasticizers to gel polymer electrolytes may lead to new problems: ① Compatibility and stability among the components in the gel system. There should be good compatibility and poor stability between the components of the gel system. After long-term storage, the solvent penetration phenome...

AI Technical Summary

Problems solved by technology

However, adding plasticizers to gel polymer electrolytes may lead to new problems: ① Compatibility and stability between components in the gel system

② Poor mechanical properties

In order to improve the conductivity of the system, more plasticizers must be added to the system, and the increase of plasticizers will lead to a decrease in mechanical properties

③Poor interface stability

④ Low cation transfer number

[0003] As a GPE matrix, polymethyl methacrylate (PMMA) has a carbonyl side group in its structural unit, which has a strong interaction with the oxygen in the carbonate plasticizer, so it can accommodate a large amount of liquid electrolyte and perform well compatibility, and PMMA series GPE has good interfacial stability for lithium electrodes, but it also has the disadvantages of general gel systems, such as poor stability and mechanical properties, low cation migration number, etc.

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