POSITIVE PLATE ACTIVE MATERIAL FOR NONAQUEOUS ELECTROLYTIC SECONDARY CELL AND NONAQUEOUS ELECTROLYTIC SECONDARY CELL CONTAINING THE SAME

A positive electrode active material for nonaqueous electrolytic solution secondary batteries is substantially made of a Li containing transition metal composite oxide, which has a composition expressed by LiMSnO (wherein M is a transition metal, such as Co, Ni, Mn, Fe and V, and 0.9 ≤ x ≤ 1.15, 0.85 ≤ y ≤ 1.00, and 0 < z < 0.001). Such positive electrode active material is excellent in particle size controllability (miniaturization and sharpening of the particle size distribution). A nonaqueous electrolytic solution secondary battery comprises a positive electrode, a separator, a negative electrode, a battery case accommodating these, and a nonaqueous electrolytic solution filled in the battery case. The positive electrode contains the positive electrode active material for the nonaqueous electrolytic solution secondary battery expressed by the aforementioned general formula.