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A positive active material, including : a lithium transition metal composite oxide represented by Formula 1 : [in-line-formulae]LiaNibM1cM2dM3eO2 Formula 1[/in-line-formulae]wherein, in Formula 1, M1 comprises Co, Mn, or a combination thereof, M2 comprises Mg and Ti, M3 comprises Al, B, Ca, Na, K, Cr, V, Fe, Cu, Zr, Zn, Sr, Sb, Y, Nb, Ga, Si, Sn, Mo, W, Ba, a rare earth element, or a combination thereof, 0.9≤a≤1.1, 0.7≤b<1.0, 0
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