Preparation method and application of PVDF-based composite electrolyte membrane

By preparing a mixture of lithium zeolite and polyvinylidene fluoride electrolyte to make a PVDF-based composite electrolyte membrane, the problem of electrochemical performance deviation of PVDF-based polymer solid electrolytes was solved, and excellent electrochemical performance with high ionic conductivity, low activation energy and wide electrochemical window was achieved.

CN120749219APending Publication Date: 2025-10-03HENAN UNIV OF SCI & TECH
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Patent Information

Application Number
CN202510946568.0
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2025-07-09
Publication Date
2025-10-03

AI Technical Summary

Technical Problem

Existing PVDF-based polymer solid electrolytes have problems with electrochemical performance deviation, especially in the field of high-voltage lithium metal batteries, where it is difficult to form a stable electrolyte-electrode interface.

Method used

Lithium zeolite is prepared by mixing dehydrated zeolite with a lithium salt solution, and then mixed with a polyvinylidene fluoride electrolyte and a lithium salt, and coated on a substrate to form a PVDF-based composite electrolyte membrane, using lithium zeolite to improve electrolyte performance.

Benefits of technology

It improves the ionic conductivity of the PVDF-based composite electrolyte membrane, reduces the activation energy, enhances the uniform deposition ability of lithium, expands the electrochemical window, and improves the lithium ion transfer number and cycle performance.

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Abstract

The invention relates to a preparation method and application of a PVDF-based composite electrolyte membrane, and belongs to the technical field of lithium battery electrolyte. The preparation method of the PVDF-based composite electrolyte membrane comprises the following steps: mixing dehydrated zeolite and lithium chloride, and replacing a sodium element in the dehydrated zeolite with a lithium element to prepare lithium zeolite; and preparing the lithium zeolite, polyvinylidene fluoride and lithium salt into an electrolyte membrane. The PVDF-based composite electrolyte membrane prepared by adopting the method has good ionic conductivity, relatively low activation energy and relatively high exchange current density and critical current density, can promote uniform deposition of lithium when being used for a lithium battery, has relatively high lithium ion transfer number and relatively wide electrochemical window, and can be applied to the lithium battery. And the lithium ion battery has relatively good cycle performance under different current densities, and shows excellent electrochemical performance.
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