Patent ID: 7592100

Claim:
A positive electrode active material for a non-aqueous electrolyte battery, comprising crystalline particles of a lithium-containing oxide containing two kinds of transition metal elements, said crystalline particles having a layered crystal structure, and oxygen atoms constituting said lithium-containing oxide forming a cubic closest packing structure, and said two kinds of transition metal elements are nickel element and manganese element, wherein said lithium-containing oxide contains said two kinds of transition metal elements in substantially the same proportion, and said lithium-containing oxide is expressed by formula (3): Li[Li x (A y B y C p ) 1-x ]O 2 where A and B are said two kinds of transition metal elements, C is at least one kind of an added element different from A and B, 0≦x≦0.3, 0<2y+p≦1, and ⅓≦y≦0.5 and 0<p≦⅓, a mixture of crystalline particles of said lithium-containing oxide having a particle size of 0.1 to 2 μm and secondary particles of said crystalline particles having a particle size of 2 to 20 μm, and said transition metals are uniformly dispersed in said crystalline particles.