Positive active material for rechargeable lithium battery, method of preparing same, and rechargeable lithium battery including the same

摘要

The present invention refers to a positive active material for a rechargeable lithium battery including a core including at least one selected from a nickel-based composite oxide represented by Chemical Formula 1 or a lithium manganese oxide represented by Chemical Formula 2; and a coating layer on a surface of the core and including a lithium metal oxide represented by Chemical Formula 3:
€ƒ€ƒ€ƒ€ƒ€ƒ€ƒ€ƒ€ƒChemical Formula 1€ƒ€ƒ€ƒ€ƒ€ƒLiNi x Co y Mn 1-x-y O 2
wherein 0.1‰¤x‰¤0.8, and 0.1‰¤y‰¤0.8,
€ƒ€ƒ€ƒ€ƒ€ƒ€ƒ€ƒ€ƒChemical Formula 2€ƒ€ƒ€ƒ€ƒ€ƒLi a Mn b O c
wherein 1‰¤a‰¤2, 1‰¤b‰¤2, and 2‰¤c‰¤4, and
€ƒ€ƒ€ƒ€ƒ€ƒ€ƒ€ƒ€ƒChemical Formula 3€ƒ€ƒ€ƒ€ƒ€ƒLi 2 MO 3
wherein M is of Zr, Ti or a combination thereof.