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PURPOSE : A lithium secondary battery including lithium cobalt nickel manganese composite oxide is provided to reduce heat generation when temperature of battery is abnormally raised, thereby improving thermal safety and physical properties by comprising the composite oxide based on lithium, cobalt, nickel and manganese as anode active material. CONSTITUTION : A battery comprises : lithium nickel cobalt manganese composite oxide represented by LiNixCoyMn1-x-yO2 wherein x is
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