Patent ID: 11870071
Assignee: SUMITOMO METAL MINING CO., LTD.
Field: Electrical machinery, apparatus, energy (Electrical engineering)
Classification: CPC H  C  Y | IPC H

Claim 5:
6. A method for producing the positive electrode active material for non-aqueous electrolyte secondary battery containing a lithium-nickel-manganese composite oxide formed of secondary particles with a plurality of aggregated primary particles according to claim 1, the method comprising:
mixing at least either of nickel-manganese composite hydroxide particles or nickel-manganese composite oxide particles with a niobium compound and a lithium compound; and
firing the lithium-niobium mixture obtained by mixing, thereby producing the positive electrode active material according to claim 1, wherein
the nickel-manganese composite hydroxide particles and the nickel-manganese composite oxide particles contain nickel, manganese, and optionally an element M, wherein an atomic ratio of the respective metals is represented by Ni : Mn : M=(1−a−b) : a : b [where 0.05<a<0.6, 0<b<0.6, 0.33<(1−a−b), M is at least one element selected from the group consisting of Co, W, Mo, V, Mg, Ca, Al, Ti, Cr, Zr and Ta],
the lithium-niobium mixture contains niobium at 0.03 atomic% or more and 3 atomic% or less with respect to entire metal elements other than lithium, and
the positive electrode active material is adjusted so that at least a part of niobium is solid-dissolved inside the primary particles and an amount of lithium to be eluted into water when the positive electrode active material is immersed in water is 0.02% by mass or more and 0.10% by mass or less with respect to entire positive electrode active material as determined by a neutralization titration method.