Low-moisture high-safety lithium battery diaphragm and preparation method thereof

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Modifying the gamma-phase ultrafine porous alumina by silane coupling agent reduces the water content of the lithium battery separator, solving the problem of high diaphragm water content, achieving a low moisture, high safety and high performance separator, and improving the overall performance of the lithium battery.

CN119651050APending Publication Date: 2025-03-18HEBEI GELLEC NEW ENERGY MATERIAL SCI&TECHNOLOY CO LTD

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Patent Information

Application Number: CN202411695306.3
Authority / Receiving Office: CN · China
Patent Type: Applications(China)
Current Assignee / Owner
Filing Date: 2024-11-25
Publication Date: 2025-03-18

Application Information

Patent Timeline

25 Nov 2024

Application

CN202411695306.3

18 Mar 2025

Publication

CN119651050A

IPC: H01M50/449; H01M50/431; H01M50/446; H01M50/403; H01M50/489; H01M50/497; H01M50/682

CPC: Y02E60/10

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AI Technical Summary

Technical Problem

The water content of existing lithium battery separators is relatively high, which affects performance, especially in high humidity environments.

Method used

The surface modification of the gamma-phase ultrafine porous alumina is formed by surface modification of the gamma-phase ultrafine porous alumina by using a silane coupling agent, which reduces the water content of the separator while maintaining high ionic conductivity and excellent wetting.

Benefits of technology

It realizes a low moisture, high safety and high performance lithium battery separator, improves the liquid absorption and liquid retention ability of the separator, reduces the internal resistance of the lithium battery, and improves the power density.

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Abstract

The invention discloses a low-moisture and high-safety lithium battery diaphragm and a preparation method thereof.The low-moisture and high-safety lithium battery diaphragm comprises a base membrane and a coating on the base membrane, the coating comprises modified gamma-phase superfine porous aluminum oxide, the modified gamma-phase superfine porous aluminum oxide is obtained by modifying gamma-phase superfine porous aluminum oxide through a silane coupling agent, and the modified gamma-phase superfine porous aluminum oxide is prepared from modified gamma-phase superfine porous aluminum oxide. The silane coupling agent is one of a vinyl silane coupling agent and a methyl silane coupling agent. According to the invention, surface modification is carried out on gamma-phase superfine porous alumina by using a silane coupling agent with a hydrophobic group, so that the diaphragm has high ionic conductivity, good high temperature resistance and good liquid absorption and retention capability, and meanwhile, the water content of the diaphragm is reduced.

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