Binder, separator including the same, and lithium secondary battery

The binder, composed of specific structural units applied to the separator, addresses the issue of separator shrinkage and damage in lithium secondary batteries, enhancing heat resistance and adhesive strength to ensure battery stability and safety.

JP2025079300AActive Publication Date: 2025-05-21SAMSUNG SDI CO LTD
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Patent Information

Application Number
JP2024110779
Authority / Receiving Office
JP · JP
Patent Type
Applications
Current Assignee / Owner
Priority Date
2023-11-09
Filing Date
2024-07-10
Publication Date
2025-05-21
Estimated Expiration
2044-07-10

AI Technical Summary

Technical Problem

Lithium secondary batteries face issues with separator shrinkage and damage at high temperatures, leading to potential battery fires due to contact between positive and negative electrodes.

Method used

A binder for lithium secondary batteries is developed, comprising a combination of structural units derived from (meth)acrylic acid, hydroxyalkyl (meth)acrylate, and (meth)acrylamidosulfonic acid, which is applied to a separator to enhance heat resistance and adhesive strength.

Benefits of technology

The binder provides a lithium secondary battery with improved life characteristics at both room and high temperatures, ensuring stability and safety by preventing separator shrinkage and maintaining low resistance.

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Abstract

To provide a binder for a lithium secondary battery having high heat resistance and low resistance.SOLUTION: The present invention relates to a binder, a separator including the binder, and a lithium secondary battery including the binder, the binder includes a first structural unit derived from (meth)acrylic acid, or a (meth)acrylate, or a salt thereof, a second structural unit derived from a hydroxyalkyl (meth)acrylate, and a third structural unit derived from (meth)acrylamidosulfonic acid or a salt thereof.SELECTED DRAWING: Figure 1
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