Patent ID: 7648800

Claim:
A method of producing a positive electrode active material for a non-aqueous electrolyte cell, comprising the sequential steps of: (1) mixing ingredients of a lithium composite manganese oxide; (2) molding the mixture of said ingredients of a lithium composite manganese oxide-under pressure; and (3) sintering the molded mixture at a temperature not lower than 600° C. and not higher than 850° C., wherein the lithium composite manganese oxide has a spinel structure and is expressed by a general formula Li x Mn 2-y M y O 4 wherein 0.90≦x≦1.4; 0≦y≦0.30; and M is one or more materials selected from the group consisting of Ti, V, Cr, Fe, Co, Ni, and Al, wherein the lithium composite manganese oxide is in the form of an aggregate having a primary particle diameter of not less than 0.05 pm and not greater than 10 pm, and having a specific surface area measured by the BET method of not less than 0.2 m 2 /g and not greater than 2 m 2 /g.