Method for producing lithium manganese oxide, lithium manganese oxide, positive electrode for lithium ion secondary battery having positive electrode material and lithium ion secondary battery

摘要

A method of producing lithium manganese oxide having a spinel structure by contacting and dissolving manganese halides and lithium compounds in a liquid phase of 100 u00b0 C. or less, and a chemical formula lixmnoy obtained by this manufacturing method (x in the equation, X is a real number of 0 x u2266 0.8, y is 1.8 u2266 y Real numbers. Lithium manganese oxide having an average particle size of 1 to 50. Mu. M and a specific surface area of 10 to 150 m.sup. 2 / g, a positive electrode for a lithium ion secondary battery which serves as a positive electrode active material and a lithium ion secondary battery using this positive electrode.