POSITIVE ELECTRODE ACTIVE MATERIAL FOR LITHIUM SECONDARY BATTERY AND ITS MANUFACTURING METHOD AS WELL AS LITHIUM SECONDARY BATTERY USING IT

摘要

PROBLEM TO BE SOLVED: To restrain degradation of an initial discharge capacity to a minimum and effectively restrain lowering of capacity accompanied by progress of charge/ discharge cycle at a high temperature.

SOLUTION: The positive electrode active material for the lithium secondary battery is composed of an active material main body consisting of spinel-type lithium-manganese complex oxide with a part of Mn substituted by an element M, Li(1+x)Mn(2-x-y)MyO4and a coating layer applied on at least a part of the surface of the active material main body, and the coating layer is either a lithium compound, a lithium manganese complex oxide or a manganese compound with a Mn of 2 to 4 valences obtained from a reduction treatment of the active material main body.

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