A composite gel electrolyte and its preparation method and application

By using polymer polymer matrix and metal alkoxide additives to prepare composite gel electrolytes in lithium metal batteries, the problems of low ionic conductivity and poor stability of gel electrolytes in the prior art are solved, and high energy density and good electrochemical properties are achieved.

CN115966761BActive Publication Date: 2025-08-26XUZHOU NORMAL UNIVERSITY
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Patent Information

Application Number
CN202211535836.2
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2022-12-02
Publication Date
2025-08-26
Estimated Expiration
2042-12-02

AI Technical Summary

Technical Problem

The existing gel electrolytes have problems with low ionic conductivity, insufficient energy density and poor stability in lithium metal batteries, and the addition of inorganic fillers leads to the easy recrystallization of the electrolyte, affecting the performance of the battery.

Method used

The method of combining polymer matrix with metal alkoxide additives is used to construct a polyorganomethoxane network through in-situ polymerization to prepare composite gel electrolytes to improve ionic conductivity and stability.

Benefits of technology

It significantly improves the ionic conductivity and thermal stability of the composite gel electrolyte, enhances the cyclic stability and compatibility of lithium metal batteries, and improves the electrochemical performance of the batteries.

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Abstract

The present invention discloses a method for preparing a composite gel electrolyte, as well as its preparation method and application. The method comprises the following steps: preparing a polymer solution: mixing a high molecular weight polymer matrix with an organic solvent, stirring and dissolving the mixture at room temperature to obtain a transparent and uniform polymer solution; preparing a composite gel film: adding a metal alkoxide additive to the polymer solution, stirring the mixture evenly, and then standing the mixture to solidify. After the solvent evaporates, a smooth and flexible polymer film is obtained, and the polymer film is then dried; and preparing a composite gel electrolyte: immersing the polymer film in an electrolyte solution, and obtaining a gel polymer electrolyte after the polymer film swells. The composite gel electrolyte prepared by this method can have excellent ionic conductivity, high energy density, and stability, good compatibility with the positive and negative electrodes of lithium batteries, and can exhibit excellent electrochemical performance when applied to lithium metal batteries.
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