Method for manufacturing an active material layer for a battery, an active material layer for a battery, and a battery

The use of a femtosecond laser with controlled parameters to sublimate the binder on the active material layer addresses the issues of reduced capacity and resistance in batteries by enhancing electrolyte permeability and maintaining active material integrity.

JP7868585B2Active Publication Date: 2026-06-02TOYOTA JIDOSHA KK
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Patent Information

Authority / Receiving Office
JP · JP
Patent Type
Patents
Current Assignee / Owner
TOYOTA JIDOSHA KK
Filing Date
2023-09-08
Publication Date
2026-06-02

AI Technical Summary

Technical Problem

Existing methods for forming electrode layers in batteries using non-aqueous electrolytes, such as laser irradiation, can reduce the amount of active material, leading to lower battery capacity and increased resistance due to reduced electrolyte permeability.

Method used

A method involving the use of a femtosecond laser with controlled heat input and overlap rate to sublimate the binder on the surface of the active material layer, reducing particle size and creating a penetration path for electrolyte while minimizing active material removal.

Benefits of technology

This approach reduces battery resistance while maintaining or enhancing battery capacity by ensuring electrolyte penetration and preserving the active material content.

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Patent Text Reader

Abstract

To provide a manufacturing method for an active material layer for a battery that can reduce battery resistance while suppressing the reduction of battery capacity in the battery.SOLUTION: The manufacturing method for an active material layer for a battery includes the steps for preparing an active material layer which includes a binder and active material, and irradiating the active material layer with a femtosecond laser at a heat input of 0.04 J / mm2 or more and 0.32 J / mm2 or less.SELECTED DRAWING: None
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