| abstract |
To provide a positive electrode active material for a non-aqueous electrolyte secondary battery, which can achieve high capacity and high output simultaneously, and a non-aqueous electrolyte secondary battery using the same. A non-aqueous electrolyte secondary battery is obtained by using as a positive electrode, a positive electrode active material for a non-aqueous electrolyte secondary battery, which is expressed by the general formula: Li x (Ni 1-y Co y ) 1-z M z O 2 (0.98≤x≤1.10, 0.05≤y≤0.4, 0.01≤z≤0.2, M = at least one element selected from the group of Al, Zn, Ti and Mg), and which has a Li site occupancy of the Li site in crystal of 98.5% or more, and a metal site occupancy of the metal site of from 95% to 98% inclusive, obtained by Rietveld analysis. |