A method for preparing a modified silica composite separator and applications thereof

CN116526062BActive Publication Date: 2026-06-16SVOLT ENERGY TECHNOLOGY CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
SVOLT ENERGY TECHNOLOGY CO LTD
Filing Date
2023-03-30
Publication Date
2026-06-16

AI Technical Summary

⚠Technical Problem

Existing lithium-ion battery separators have low mechanical strength and low conductivity under high voltage and high temperature, resulting in high internal resistance and making it difficult to meet the requirements of high-rate performance.

⚗Method used

A hollow metal silicate shell structure is generated by acid etching and alkaline etching of silica composite membranes through hydrothermal synthesis, which improves the tensile strength and ionic conductivity of the membrane and forms an appropriate pore structure to broaden the lithium-ion transport path.

🎯Benefits of technology

It significantly reduces the internal resistance of secondary batteries, increases the lithium-ion transference number, enhances mechanical strength, reduces charging and discharging energy consumption, and improves battery performance.

✦ Generated by Eureka AI based on patent content.

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Abstract

The application provides a method for preparing a modified silica composite diaphragm and application. The method comprises the following steps: (1) performing acid etching treatment on a silica composite diaphragm to obtain a precursor material; (2) mixing a metal salt, an alkali material and a solvent to obtain a mixed solution, and then adding the precursor material obtained in step (1) into the mixed solution, and performing hydrothermal reaction to obtain the modified silica composite diaphragm. The method of hydrothermal synthesis is used to improve and modify the original polyolefin diaphragm with silica embedded therein, and a composite diaphragm with good tensile strength, infiltration performance and high ionic conductivity is obtained. The treatment method is simple, mass production can be carried out, and the resistance of the secondary battery can be significantly reduced, so that the secondary battery can be charged and discharged at high voltage.
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