Patent ID: 11967709
Assignee: SUMITOMO METAL MINING CO., LTD.
Field: Electrical machinery, apparatus, energy (Electrical engineering)
Classification: CPC H  C  Y | IPC H

Claim 0:
1. A positive electrode active material for non-aqueous electrolyte secondary batteries, the positive electrode active material comprising:
a lithium-metal composite oxide powder comprising a plurality of secondary particles, each secondary particle comprising a plurality of primary particles containing lithium, nickel, manganese, and cobalt, wherein
each secondary particle in the plurality of secondary particles comprises a plurality of hollow structures,
a mixed slurry being a mixture of water and the lithium-metal composite oxide powder as a slurry solid body component has a pH of 11.5 or less at a time when the mixed slurry contains the lithium-metal composite oxide powder at a slurry concentration of 50 [g/L],
the lithium-metal composite oxide powder contains soluble lithium at a content rate of 0.5 [% by mass] or less,
the lithium-metal composite oxide powder is represented by a general formula: Lia(Ni1-w-xMnwCox)1-yMyO2: 0.98≤a≤1.20, 0.01≤w≤0.50, 0.01≤x≤0.50, 0.01≤y≤0.10, where M is one or more of Fe, Cu, Si, Zn,
the lithium-metal composite oxide powder has a particle strength of 150 to 180 MPa,
the lithium-metal composite oxide powder has a specific surface area of 2.0 to 3.0 [m2/g], and
the secondary particle has a porosity of 20 to 50 [%].