| 摘要 |
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<SUB>x</SUB>(Ni<SUB>1-y</SUB>Co<SUB>y</SUB>)<SUB>1-z</SUB>M<SUB>z</SUB>O<SUB>2 </SUB>(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.
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