Patent ID: 11876222
Assignee: SUMITOMO METAL MINING CO., LTD.
Field: Electrical machinery, apparatus, energy (Electrical engineering)
Classification: CPC H  C  Y | IPC C  H

Claim 0:
1. A cathode active material for a nonaqueous-electrolyte secondary battery that is essentially composed of a lithium nickel composite oxide that is expressed by the general expression:
Li1+uNixMnyCozMtO2 (x+y+z+t=1, 0.3≤x, 0≤y≤0.55, 0≤z≤0.4, 0≤t≤0.1, wherein 0.7≤x, −0.05≤u≤0.50, or 0.3≤x≤0.7, 0.10≤u≤0.50, and M as an additive element is selected from one or more of among Al, Ti, V, Cr, Zr, Nb, Mo, Hf, Ta and W, and has a hexagonal crystal structure with a layered structure;
the lithium nickel composite oxide composed of substantially spherical secondary particles that are formed of sintered primary particles that clump together, wherein Li, Ni, Mn, and Co are uniformly dispersed throughout the primary particles,
wherein
an average particle size thereof is greater than 8 μm and less than or equal to 16 μm, and a value [(d90−d10)/average particle size], which is an index that indicates the extent of the particle size distribution, being 0.60 or less,
the tap density is 2.0 g/cm3 or more, and
wherein the secondary particles respectively have a solid structure that is dense from the outside to the inside by the sintered primary particles that clump together, and the specific surface area is preferably 0.2 m2/g or greater and 1.5 m2/g or less.