| abstract |
Provided is a means capable of suppressing elution of transition metals, particularly manganese, in a positive electrode active material for a non-aqueous electrolyte secondary battery. According to the present invention, the following composition formula (1): Li 1.5 [Ni a Mn b Co c [Li] d [X] e ] O z , where X is Ti, Zr and At least one of Nb, 0.01 ≦ e ≦ 0.7, a + b + c + d + e = 1.5, 0.1 ≦ d ≦ 0.4, 1.1 ≦ [a + b + c + e] ≦ 1.4, z Is represented by the number of oxygen satisfying the valence, and in X-ray diffraction (XRD) measurement, 20-23 °, 35-40 ° (101), 42-45 ° (104) and 64- 65 (108) / 65-66 (110) provides a positive electrode active material for a non-aqueous electrolyte secondary battery having a diffraction peak showing a rock salt type layered structure. |