| abstract |
(57) [Summary] [Purpose] To provide a secondary battery having excellent cycleability. [Configuration] LixNayOz (M represents cobalt or a mixed metal mainly containing cobalt and containing a small amount of at least one of nickel and manganese. X is 0.20 ≦ x ≦ 1. 10, y is 0.01 ≦ y ≦ 0.30, z is 1.95 ≦ z A non-aqueous secondary battery whose positive electrode active material is ≦ 2.45). |