Edge adhesive, coating composition for positive electrode sheet, positive electrode sheet, and battery

By coating the edges of the positive electrode of a lithium-ion battery with an oil-soluble polymer edge adhesive, the problems of burrs and powder shedding during electrode cutting are solved, and a tight bond between the electrode and the separator is achieved, improving the safety and electrochemical performance of the battery.

CN122136361APending Publication Date: 2026-06-02MEISHAN INDIGO TECH CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
MEISHAN INDIGO TECH CO LTD
Filing Date
2024-12-02
Publication Date
2026-06-02

AI Technical Summary

Technical Problem

Existing lithium-ion battery positive electrode sheets are prone to burrs and powder shedding during slitting, which can lead to internal short circuits in the battery. Furthermore, the separator and positive electrode sheet are not tightly bonded, affecting battery safety and cycle performance.

Method used

An oil-soluble polymer is used as an edge adhesive. By coating the edge of the positive electrode with a grafted polymer with a flexible polymer as the main chain and a polar polymer as the branch chain, combined with nano-inorganic fillers, an edge coating composition is formed to achieve protection of the blank foil area and strong adhesion of the separator.

Benefits of technology

This effectively avoids burrs and powder shedding during electrode cutting, ensures close contact between the electrode and the separator, reduces the risk of battery short circuit, and improves battery safety and electrochemical performance.

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Abstract

This invention relates to edge adhesive for positive electrode sheets, coating compositions, positive electrode sheets, and batteries, belonging to the field of lithium-ion battery technology. The technical problem solved by this invention is to provide an edge adhesive for positive electrode sheets. This edge adhesive comprises an oil-soluble polymer with a flexible polymer as the main chain and a polar polymer as the branch chain. The edge adhesive of this invention has good adhesion to metal foils and a hot-pressing bonding effect on olefin separators. Without changing existing processes and equipment, the edge adhesive composition is simultaneously applied to the edge of the positive electrode sheet during coating, completely avoiding burrs and powder shedding. In the subsequent hot-pressing and shaping of the battery cell, this coating composition can firmly bond the electrode sheet and separator together, maintaining the flatness of the electrode assembly and preventing electrode misalignment during battery vibration, which can reduce the risk of short circuits in the battery cell and improve the overall safety and electrochemical performance of the battery.
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