Positive electrode active material for nonaqueous electrolyte secondary battery and method of producing the same

Abstract

The present invention provides a positive electrode active material for non-aqueous electrolyte secondary battery comprising: core particles comprising a lithium transition metal composite oxide represented by the general formula: LiaNi1-x-yCoxM1yM2zO2 wherein 1.00≦a≦1.50, 0.00≦x≦0.50, 0.00≦y≦0.50, 0.00≦z≦0.02, 0.00≦x+y≦0.70, M1 is at least one element selected from the group consisting of Mn and Al, M2 is at least one element selected from the group consisting of Zr, Ta, Nb and Mo, and a surface layer located on a surface of the core particles, and the surface layer comprising boron, tungsten and oxygen; wherein the surface layer is obtained by heat-treating the core particles; a raw material compound (1) that is at least one compound selected from the group consisting of boron oxide, an oxo acid of boron, and a salt of an oxo acid of boron; and tungsten oxide (VI).

Dependencies are inferred from the claim text.