Samsung Sdi Co., Inc.

Hyunjoo Je

Jihyun Kim

Changwook Kim

Yongchan You

Sooyoun Park

Kyouyoon Sheem

A composite positive electrode active material for a lithium secondary battery including a compound represented by Formula 1 below and a compound represented by Formula 2 below, and a lithium secondary battery employing a positive electrode that includes the composite positive electrode active material:LiNiCoMnMO&#x2003;&#x2003;Formula 1wherein, in Formula 1, ranges of M, a, x, and y are as defined in the detailed description above, andM[M(CN)]HO&#x2003;&#x2003;Formula 2wherein, in Formula 2, M, M, z, x, and n are as defined in the detailed description above.

Composite positive electrode active material for lithium secondary battery and lithium secondary battery comprising electrode including the composite positive electrode active material

A positive active material for a rechargeable lithium battery and a rechargeable lithium battery including the same are provided. The positive active material includes a lithium intercalation compound and a Si-containing TiOpresent on the surface of the compound. When TiOis present on the surface of the lithium intercalation compound, the rate characteristics and low temperature characteristics of batteries including the lithium intercalation compound may be improved. Further, when Si-containing TiOis present on the surface of the lithium intercalation compound, the cycle-life characteristic and high temperature storage characteristics of batteries including the lithium intercalation compound may be further improved, compared to batteries having only TiO. As such, the positive active material including Si-containing TiOprovides a rechargeable lithium battery having excellent rate capability, low temperature characteristics, cycle-life characteristics and high temperature storage characteristics.

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Yongin-si, South Korea

Hyunjoo Je