ANODE ACTIVE MATTER AND PRODUCTION METHOD THEREFOR, NON- AQUEOUS ELECTROLYTE SECONDARY BATTERY-USE ANODE, AND NON-AQUEOUS ELECTROLYTE SECONDARY BATTERY

Positive active materials are provided with which a non-aqueous electrolyte secondary battery having a high energy density and excellent charge/discharge cycle performance can be produced. Also provided are a positive electrode for non-aqueous electrolyte secondary batteries which comprises the positive active materials and a non-aqueous electrolyte secondary battery. One of the positive active materials comprises a composite oxide represented by the composite formula LiaMn0.5-xNi0.5-yMx+yO2 (wherein 0.98