PRODUCTION METHOD OF LITHIUM-MANGANESE COMPOUND OXIDE, LITHIUM-MANGANESE COMPOUND OXIDE OBTAINED BY THE PRODUCTION METHOD, POSITIVE ACTIVE MATERIAL FOR SECONDARY BATTERY CONTAINING THE SAME AND LITHIUM ION SECONDARY BATTERY USING THE SAME AS POSITIVE ACTIVE MATERIAL

摘要

PROBLEM TO BE SOLVED: To provide a production method of a lithium-manganese compound oxide which ensures a high discharge capacity when used as a positive active material, and exhibits excellent cycle characteristics when used at high temperature.SOLUTION: A production method of a lithium-manganese compound oxide includes: a precursor preparation step in which a lithium source, a manganese source, a compound containing Mand a compound containing Mare ground and mixed so that the ratio of the numbers of atoms becomes Li:Mn:M:M=(α+&bgr;):(2-&bgr;-γ-δ):γ:δ, while being contained in a solvent, and the resulting slurry is dried to obtain a precursor; a first firing step of obtaining a primary fired product by firing the precursor at 600-1,200°C; a washing step of obtaining a washed product by washing the primary fired product; and a second firing step of obtaining a lithium-manganese compound oxide represented by LiMnMOby firing the washed product at 600-1,200°C.