| abstract |
It is an object of the present invention to provide a positive electrode active material capable of exhibiting sufficient cycle characteristics in a nonaqueous electrolyte secondary battery. The non-aqueous electrolyte secondary battery, the positive electrode active material of the present invention, the composition formula (2): Li x [Ni (1/3-a) [M] a Mn 2/3] O 2 ( wherein, M is Cu, Zn, At least one member selected from the group consisting of Mg, Fe, Al, Co, Sc, Ti, V, Cr, Ga, Ge, Bi, Sn, Ca, B and Zr, and x represents the number of Li satisfying the valence). Is Na 2/3 [Ni (1 /3-a) [M] a Mn 2/3] O 2 ( wherein, M and a,: and, art the non-aqueous electrolyte secondary battery, the positive electrode active material, the composition formula (1) The same as in the composition formula (2)) is subjected to reduction ion exchange. |