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PROBLEM TO BE SOLVED : To provide a lithium-ion secondary battery using lithium nickel complex oxide as cathode activator having cycle property improved than before in case of repeating intermittent cycle. SOLUTION : A cathode of the lithium ion secondary battery comprises an active material particle represented by the general formula : LixNil-yMyMezO2+δ, and the active material particle comprises a lithium complex oxide expressed by a general formula : LixNi1-yMyO2 (wherein, 0.95≤x≤1.1, 0
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