| abstract |
An inexpensive positive electrode active material for a non-aqueous electrolyte secondary battery which has a higher capacity than the current LiCoO 2 , has better thermal stability in a charged state, and is less expensive, is represented by the following composition formula (1) and belongs to a hexagonal crystal structure. In addition to the main diffraction peaks, which are given by a lithium composite oxide, which shows an X-ray diffraction diagram including the diffraction peaks of the composite oxide of Li and W and / or of the composite oxide of Li and Mo: Li a Ni b Co c Mn d M e O 2 ‥‥ (1) In the formula, M means one or two of W and Mo, and 0.90 ≦ a ≦ 1.15, 0 <b <0.99, 0 <c ≦ 0.5, 0 <d ≦ 0 0.5, 0 <c + d ≦ 0.9, 0.01 ≦ e ≦ 0.1, and b + c + d + e = 1. |