Lithium ion secondary battery

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A lithium ion secondary battery including a positive electrode containing an active material particle including a lithium composite oxide, wherein the lithium composite oxide is represented by LixM1-yLyO2, where 0.85≦x≦1.25, 0≦y≦0.50, M is at least one element selected from the group consisting of Ni and Co, and L is at least one element selected from the group consisting of alkaline-earth elements, transition metal elements except Ni and Co, rare-earth elements, IIIb group elements and IVb group elements, and a molybdenum oxide represented by LiaMoOb, where 1≦a≦4 and 1≦b≦6, is present in a surface portion of the active material particle.