| abstract |
It is a cathode active material with high capacity and improved charge / discharge cycle characteristics. The battery has a positive electrode 2 having a cathode active material, a negative electrode 3 and a nonaqueous electrolyte, and includes a first lithium-transition metal composite oxide comprising Ni and Co and having a layered structure, and a Ni and Mn layered structure. A cathode active material consisting of a mixture of a second lithium-transition metal composite oxide consisting of is used. |