Lg Chem, Ltd

Hyeokmoo Lee

Song Taek Oh

Ji Hye Park

Su Rim Lee

Jungseok Choi

Jae Hyun Lee

Disclosed are a cathode active material for high voltage lithium secondary batteries and a lithium secondary battery including the same and, more particularly, the present invention relates to a cathode active material for lithium secondary batteries that includes a lithium transition metal oxide having a lithium molar fraction of greater than 1, containing a relative excess of nickel, and having a composition represented by Formula 1 below, wherein the lithium transition metal oxide has a LiMnO-like structure phase:LiNiCoMnMOA&#x2003;&#x2003;(1)

Cathode active material for high voltage lithium secondary battery and lithium secondary battery including the same

Disclosed are a cathode active material for lithium secondary batteries and a lithium secondary battery including the same and, more particularly, the present invention relates to a cathode active material for lithium secondary batteries that includes a mixture of an overlithiated transition metal oxide represented by Formula 1 below and a lithium composite transition metal oxide represented by Formula 2 below:LiNiMnCoMOA&#x2003;&#x2003;(1)LiNiMnCoM'OA&#x2032;&#x2003;&#x2003;(2)

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Daejeon, South Korea

Hyeokmoo Lee