POSITIVE ELECTRODE ACTIVE MATERIAL OF NONAQUEOUS ELECTROLYTE SECONDARY BATTERY AND SECONDARY BATTERY USING IT

摘要

PROBLEM TO BE SOLVED: To provide a positive electrode active material of a nonaqueous secondary battery having a high capacity and an excellent cycle characteristic. SOLUTION: The positive electrode active material of the nonaqueous secondary battery is a rhombic system LiMnO2 where manganese ions have an average oxidation number of not less than 3.03 nor more than 3.08, with a BET specific surface ration of 8 m<2> /g or more.