Positive active material for lithium secondary battery and secondary battery comprising the same

A positive active material for a lithium secondary battery comprises a core comprising a compound that can reversibly intercalate and deintercalate lithium; and a lithium ion conductive ceramic compound attached to the surface of the core and represented by Chemical Formula 1: €ƒ€ƒ€ƒ€ƒ€ƒ€ƒ€ƒ€ƒ [Chemical Formula 1]€ƒ€ƒ€ƒLi 1+x M(I)M(II) 2-x Si y P 3-y O 12 , wherein M(I) and M(II) are selected from the group consisting of Al, Zr, Hf, Ti, Ge, Sn, Cr, Nb, Ga, Fe, Sc, In, Y, La, Lu, and Mg, and 0