Repairable cross-linked solid polymer electrolyte as well as preparation method and application thereof

Abstract

The invention provides a repairable cross-linked solid polymer electrolyte as well as a preparation method and application thereof, and the repairable cross-linked solid polymer electrolyte is prepared by the following method: dispersing and dissolving terephthalaldehyde, bisphenol A diglycidyl ether, polyethylene glycol diamine and a lithium salt in an acetonitrile solvent, and carrying out stirring for 2-6 hours to obtain a transparent and uniform mixed solution A; dropwise adding the mixed solution A onto a polytetrafluoroethylene mold, and volatilizing acetonitrile at room temperature to obtain a sol-like substance B; and putting the sol-like substance B into a vacuum drying oven, carrying out polymerization reaction to completely crosslink and solidify the sol-like substance B, and continuously heating to dry the sol-like substance B to prepare the polymer electrolyte. According to the invention, a dynamic imine covalent bond is introduced into the polymer electrolyte to form thesolid network-shaped polymer electrolyte, so that the solid network-shaped polymer electrolyte can be repaired in time when fracture occurs in the use process; the prepared network-like polymer electrolyte has high thermal stability and dendritic-crystal-free morphology, and has excellent electrochemical properties such as ionic conductivity and lithium ion migration number.

Description

Technical field [0001] The present invention relates to the field of lithium metal batteries, and in particular to a repairable cross-linked solid polymer electrolyte and its preparation method and application. Background technique [0002] In order to cope with the "energy crisis" and increasingly stringent environmental protection requirements, governments around the world have introduced new energy policies to encourage the development of new, green and new energy. At the same time, as people's material living standards are getting higher and higher, the demand for energy is increasing rapidly, which has promoted the rapid development of the energy storage field, especially battery technology. In the 1990s, after Sony developed commercial lithium metal batteries using graphite anodes and an intercalation reaction mechanism, lithium metal batteries quickly occupied high-end electronic equipment such as laptops and mobile phones. With the development of technology, new sma...

AI Technical Summary

Problems solved by technology

Under the current technical conditions, although the thin polymer electrolyte membrane in flexible lithium metal batteries has a high degree of flexibility, it is easy to break when deformed and cannot be repaired, resulting in the failure of LMBs, and may even cause safety accidents such as chemical electrolyte leakage.

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