MANGANESE SYSTEM POSITIVE ELECTRODE MATERIAL HAVING EXCELLENT CYCLE PROPERTY AND LITHIUM SECONDARY BATTERY USING THE SAME

摘要

PROBLEM TO BE SOLVED: To obtain a Mn system positive electrode material and a lithium secondary battery using the material which finely maintains an initial capacity and a large charging factor, stabilizes an oxidation number of the Mn in the material, and has a good cycle property of charging. SOLUTION: A positive electrode active material for the lithium secondary battery is a particle expressed by formula Li1+x(Mn2-x)O4 (x is 0-0.20). A surface of Mn system positive material, which is excellent in the cycle property, is coated with LiNixCo1-xO2 (x is more than 0 and less than 1.0).