Nonaqueous electrolyte secondary battery and method of forming positive electrode

摘要

A positive electrode active material is formed of a lithium containing layered oxide. The lithium containing layered oxide contains either or both of LiANaBMnxCoyO2±α that belongs to a space group P63mc or LiANaBMnxCoyO2±α that belongs to a space group Cmca. The lithium containing layered oxide contains the LiANaBMnxCoyO2±α as a solid solution, a mixture or both of them. In the LiANaBMnxCoyO2±α, 0.5≦̸A≦̸1.2, 0<B≦̸0.01, 0.40≦̸x≦̸0.55, 0.40≦̸y≦̸0.55, 0.80≦̸x+y≦̸1.10 and 0≦̸α≦̸0.3.