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:
Jan. 20, 2026
Filed:
Oct. 31, 2017
Sumitomo Metal Mining Co., Ltd., Tokyo, JP;
SUMITOMO METAL MINING CO., LTD., Tokyo, JP;
Abstract
A positive electrode active material reduces an eluted lithium amount when used for a nonaqueous electrolyte secondary battery, and a nickel-manganese composite hydroxide as a precursor. A nickel-manganese composite hydroxide contains a secondary particle formed of a plurality of mutually flocculated primary particles and is represented by Formula (1): NiMnM(OH)(0.70≤x1≤0.95, 0.05≤y1≤0.30, x1+y1+z1=1.0, and 0≤α≤0.4 are satisfied; and M is at least one element selected from Co, Al, Ti, V, Cr, Zr, Nb, Mo, Hf, Ta, Fe, and W). The nickel-manganese composite hydroxide has a manganese-rich layer from a particle surface to a particle inner part of the secondary particle. The manganese-rich layer is represented by Formula (2): NiMnM(OH). The thickness of the manganese-rich layer is at least 5% and up to 20% of the radius of the secondary particle.