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:
Oct. 14, 2025
Filed:
Apr. 01, 2019
Sumitomo Metal Mining Co., Ltd., Tokyo, JP;
Kentaro Kondo, Niihama, JP;
Tetsufumi Komukai, Tokyo, JP;
SUMITOMO METAL MINING CO., LTD., Tokyo, JP;
Abstract
The cathode active material for a lithium ion secondary battery is produced from spherical particles made of lithium nickel cobalt composite oxide represented by general formula: LiNiCoMO(wherein M is at least one element selected from among Mn, V, Mg, W, Mo, Nb, Ti, and Al and x, y, and z satisfy 0<x≤0.35, 0≤y≤0.35, and 0.97≤z≤1.20, respectively) and having a volume average particle diameter MV in a range of preferably 8 to 30 μm, wherein an area ratio of a lithium compound unevenly distributed on surfaces of the particles in a SEM image is 5% or less. The spherical particles preferably have a crystallite diameter in a range of 50 to 200 Å as determined from a full width at half maximum, FWHM of diffraction peak of (003) plane obtained by X ray diffraction by using Sherrer formula.