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:
Aug. 05, 2025
Filed:
Jun. 30, 2020
Sumitomo Metal Mining Co., Ltd., Tokyo, JP;
SUMITOMO METAL MINING CO., LTD., Tokyo, JP;
PANASONIC ENERGY CO., LTD., Osaka, JP;
Abstract
The method for producing a positive electrode active material for a lithium ion secondary battery includes preparing a mixture containing at least a nickel-manganese composite compound, a lithium compound, and optionally one or both of a titanium compound and a niobium compound. The method also includes firing the mixture from 750° C. to 1000° C. so as to obtain the lithium-nickel-manganese composite oxide, in which the nickel-manganese composite compound contains at least nickel, manganese, and an element M, an amount of substance ratio (z) of titanium and an amount of substance ratio (w) of niobium to a total amount of substance of nickel, manganese, the element M, titanium, and niobium in the mixture satisfy 0.005≤z≤0.05, 0.001<w≤0.03, (z+w)≤0.06, and z>w, and at least a part of the niobium is segregated to a grain boundary between primary particles.