| abstract |
Disclosed are a solid solution lithium-containing transition metal oxide capable of realizing a high initial discharge capacity and a high capacity retention rate, and a positive electrode for a nonaqueous electrolyte secondary battery and a nonaqueous electrolyte secondary battery using the same. The solid solution lithium-containing transition metal oxide has a chemical formula: Li 1.5 [Ni a Co b Mn c [Li] d ] O 3 (where a, b, c and d are 0 <a < 1.4, 0 ≦ b <1.4, 0 <c <1.4, 0.1 <d ≦ 0.4, a + b + c + d = 1.5, 1.1 ≦ a + b + c <1.4 are satisfied. ) Containing a lithium-containing transition metal oxide. The lithium-containing transition metal oxide has a layered structure part and a part that changes to a spinel structure by charging or charging / discharging in a predetermined potential range. The lithium-containing transition metal oxide has a spinel structure change rate of 0.25 or more and less than 1.0. [Selection] Figure 1 |