POSITIVE ELECTRODE MATERIAL FOR LITHIUM SECONDARY BATTERY, ITS MANUFACTURING METHOD AND LITHIUM SECONDARY BATTERY USING IT

摘要

PROBLEM TO BE SOLVED: To provide a new positive electrode material with large charging/discharging capacity at high voltage and a good cycle property to reduce the weight of a lithium secondary battery and its manufacturing method, and to provide the lithium secondary battery using the positive electrode material.

SOLUTION: This positive electrode material for the lithium secondary battery has a chemical composition represented by LixMn1-yTiyO2(0.40< x<0.50, 0< y<0.56) and a crystal structure belonging to a rhombic system, and consists of lithium, manganese, titanium and oxygen which have a tunnel structure which lithium occupies. The sodium content is 0.05 or less in a molar ratio of Na/Li.

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