Cobalt oxide, composite of cobalt oxide, and method for making the same

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A cobalt oxide is disclosed and is represented by a chemical formula of Co1-yMyO2, wherein 0≦y≦0.9, and M is selected from the group consisting of alkali metal elements, alkaline-earth metal elements, Group-13 elements, Group-14 elements, transition metal elements, and rare-earth elements. A composite of cobalt oxide includes a cobalt oxide and an aluminum phosphate layer coated on a surface of the cobalt oxide.