Separation membrane for lithium secondary batteries and method for manufacturing the same

A porous polymer substrate with a porous coating layer of different density inorganic fine particles addresses adhesion and thermal issues in lithium secondary batteries, enhancing insulating properties and preventing internal short circuits.

JP2026510198APending Publication Date: 2026-04-02LG CHEM LTD
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Patent Information

Authority / Receiving Office
JP · JP
Patent Type
Applications
Current Assignee / Owner
Filing Date
2024-08-20
Publication Date
2026-04-02

AI Technical Summary

Technical Problem

Existing separation membranes for lithium secondary batteries suffer from insufficient adhesion to electrodes, thermal instability, and low tensile strength, leading to defects such as partial lifting, wrinkling, and internal short circuits.

Method used

A separator membrane composed of a porous polymer substrate with a porous coating layer containing a polymer binder and two types of inorganic fine particles with different compacted densities, which form a dense pore structure and high tortuosity, enhancing adhesion and insulating properties.

Benefits of technology

The proposed membrane minimizes defects, exhibits excellent insulating properties, and ensures high ionic conductivity, preventing internal short circuits and improving the safety and performance of lithium secondary batteries.

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Abstract

The present invention relates to a separation membrane for lithium secondary batteries and a method for manufacturing the same. According to the present invention, a separation membrane for lithium secondary batteries is provided that minimizes the occurrence of defects and exhibits excellent insulating properties, as well as a method for manufacturing the same.
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Citation Information

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