Manufacturing method of electrode active material, manufacturing method of secondary battery, and secondary battery

By using an alkaline aqueous solution to separate the electrode mixture from the current collector and a two-stage firing process, the method addresses the inefficiencies and environmental issues of conventional methods, producing reusable electrode active material effectively.

JP7766309B2Active Publication Date: 2025-11-10MAXELL LTD +1
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Patent Information

Application Number
JP2024544279
Authority / Receiving Office
JP · JP
Patent Type
Patents
Current Assignee / Owner
Priority Date
2022-09-01
Filing Date
2023-08-29
Publication Date
2025-11-10
Estimated Expiration
2043-08-29

AI Technical Summary

Technical Problem

Conventional methods for separating the current collector and electrode mixture in secondary batteries cause damage to the current collector, require environmentally harmful organic solvents, and are not suitable for large-scale processing.

Method used

A method involving immersing the electrode in an alkaline aqueous solution to peel the electrode mixture from the current collector, followed by neutralization, washing, and a two-stage firing process to regenerate the active material, reducing environmental impact and enabling efficient recovery.

Benefits of technology

The method allows for the efficient production of reusable electrode active material with reduced environmental burden, preserving the current collector for recycling and maintaining the active material's structure and performance.

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Patent Text Reader

Abstract

The present invention enables the achievement of a method for efficiently producing a reusable electrode active material by regenerating a used active material, which is contained in an electrode of a used secondary battery, by a simple process that has a reduced environmental impact. This method for producing an electrode active material produces a reusable electrode active material by regenerating a used active material which is contained in an electrode of a used secondary battery. With respect to this method for producing an electrode active material, the electrode is provided with a collector and an electrode mixture that is formed on the collector and contains an active material; and this method comprises a step (step S1) in which the electrode mixture is separated from the collector by immersing the electrode in an aqueous alkaline solution, and a step (step S2) in which the separated electrode mixture is neutralized.
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Citation Information

Patent Citations

  • Handotaisochi

    JP1976041970A

  • Treating method for nonaqueous secondary battery waste

    JP1996022846A

  • Method of recycling oxide-containing battery material from waste battery material

    JP2010034021A

  • Method of peeling positive electrode active material and method of recovering valuable metal from a lithium ion battery

    JP2012038572A

  • Waste battery processing method, and recovery method for battery component

    JP2013101830A