Patent ID: 9293234
Filing Date: 2016-03-22
CPC Classification: C01B,H01B,H01M,Y02E

Claim Text:
1. A positive electrode active material for nonaqueous-electrolyte secondary batteries, comprising a lithium-containing composite oxide represented by the following General Formula (1): (wherein M is at least one metal element selected from Zr, Sn, Y, and Al, 0.05<x<1, and 0.05<y<1), characterized in that: the lithium-containing composite oxide is in the single phase of the lithium-containing composite oxide represented by General Formula (1) when 1≧z>0.75 or when 0.25>z>0; a charge and discharge reaction progresses in a state where the positive electrode active material has two phases of the lithium-containing composite oxides represented by the following General Formulae (2) and (3) when 0.75>z>0.25: (wherein 0.75≦a≦1.00, 0.05<x<1, and 0.05<y<l); and (wherein 0≦b≦0.25, 0.05<x<1, b+x<1, and 0.05<y<l), and when the product of the lengths of the b and c axes of the unit cell of the lithium-containing composite oxide of General Formula (2) is designated as bc1 and the product of the lengths of the b and c axes of the unit cell of the lithium-containing composite oxide of General Formula (3) as bc2, α, which is defined by equation α=(bc2)/(bc1), is 0.99<α<1.01 in a state where the positive electrode active material has two phases.