Patent ID: 11967713
Assignee: SUMITOMO METAL MINING CO., LTD.
Field: Electrical machinery, apparatus, energy (Electrical engineering)
Classification: CPC H  Y | IPC H

Claim 0:
1. A positive electrode active material for a non-aqueous electrolyte secondary battery, comprising:
lithium-nickel composite oxide particles having a layer structure of hexagonal system; and
a lithium tungstate coating film disposed on a surface of secondary particles of the lithium-nickel composite oxide particles,
wherein the positive electrode active material for the non-aqueous electrolyte secondary battery includes, as metallic elements, lithium (Li), nickel (Ni), cobalt (Co), element M (M) which is at least one element selected from Mn, V, Mg, Mo, Nb, Ti, Ca, Cr, Zr, Ta, and Al, and tungsten (W),
wherein a ratio of amount of substance in the metallic elements contained is Li:Ni:Co:M:W=a:1-x-y:x:y:z,
wherein 0.97≤a≤1.25, 0≤x≤0.35, 0≤y≤0.35, and 0.007≤z≤0.020,
wherein a ratio of a maximum tungsten concentration to an average tungsten concentration is 5 or more and 25 or less when a line analysis is performed by STEM-EDX on a particle cross-section of the positive electrode active material for the non-aqueous electrolyte secondary battery, and
wherein a volume resistivity of the positive electrode active material when compressed to 3.2 g/cc as determined by a powder resistivity measurement is 1.0×102 Ω·cm or more and 1.0×104 Ω·cm or less.