Electrode for electrochemical element, method for manufacturing the same, and electrochemical element including the same

By forming an adhesion-promoting layer with a binder polymer on the current collector and laminating a dry electrode film under heat and pressure, the method enhances adhesive strength and reduces interfacial resistance, addressing detachment issues in electrode manufacturing.

JP7739344B2Active Publication Date: 2025-09-16LG CHEM LTD
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Patent Information

Application Number
JP2022579094
Authority / Receiving Office
JP · JP
Patent Type
Patents
Current Assignee / Owner
Priority Date
2021-02-08
Filing Date
2022-02-08
Publication Date
2025-09-16
Estimated Expiration
2042-02-08

AI Technical Summary

Technical Problem

Existing methods for manufacturing electrodes for electrochemical devices, particularly secondary batteries, face challenges in achieving strong adhesive strength between free-standing dry electrode films and current collectors, leading to detachment during assembly, and poor interfacial resistance.

Method used

A method involving the formation of an adhesion-promoting layer on the current collector using a slurry containing a binder polymer and a conductive material, followed by laminating a free-standing dry electrode film and applying heat and pressure to penetrate the binder polymer into the dry electrode film, enhancing adhesion.

Benefits of technology

Improves the adhesive strength between the dry electrode film and current collector to 30 gf/2cm or more, with an interface resistance of 2Ωcm, ensuring stable electrode assembly.

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Abstract

The present invention discloses a method for manufacturing an electrode for an electrochemical element, the method including: (S1) applying a slurry containing a binder polymer and a conductive material onto at least one surface of a current collector and drying the slurry to form an adhesion promoting layer; (S2) preparing a free-standing dry electrode film containing a dry electrode active material and a dry binder; and (S3) laminating the free-standing dry electrode film on the adhesion promoting layer, and then applying heat and pressure to the free-standing dry electrode film and the adhesion promoting layer so that the binder polymer penetrates into a surface layer of the free-standing dry electrode film in contact with the adhesion promoting layer, thereby bonding the free-standing dry electrode film and the adhesion promoting layer.
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