The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Sep. 22, 2026
Filed:
Aug. 29, 2023
Sumitomo Chemical Company, Limited, Tokyo, JP;
Kyoto University, Kyoto, JP;
Marie Takiguchi Takemoto, Osaka, JP;
Satoshi Shimano, Kyoto, JP;
SUMITOMO CHEMICAL COMPANY, LIMITED, Tokyo, JP;
Kyoto University, Kyoto, JP;
Abstract
A method for producing a positive electrode active material includes: (1) mixing an activation agent containing at least one type of compound selected from the group consisting of a potassium compound and a sodium compound with an electrode material mixture containing a positive electrode active material, a binder, and an electrolyte, from which at least part of the electrolyte is removed by contact with an electrolyte cleaning solvent; (2) heating the mixture to a temperature at or higher the melting start temperature of the activation agent to activate the positive electrode active material; and (3) contacting the mixture with a water-containing liquid to obtain a slurry containing a solid component and a liquid component, separating the slurry into a solid and a liquid component, wherein the total potassium and sodium content in the liquid component is 0.090 to 2.0 mass % and in the solid component is 1.2 mass % or less.