Patent ID: 8734994

Claim:
A cathode active material comprising a lithium metal oxide represented by Formula 1 below: Li[Li x Co b Me y M′ z ]O 2+d Formula 1 wherein x+b+y+z=1, 0<x<0.33, 0.14≦b≦0.5, 0.05≦z≦0.15, 0≦d≦0.1, Me comprises at least one metal selected from the group consisting of manganese (Mn), vanadium (V), chromium (Cr), iron (Fe), nickel (Ni), aluminum (Al), and boron (B), and M′ comprises at least one metal selected from the group consisting of germanium (Ge), ruthenium (Ru), tin (Sn), niobium (Nb), and platinum (Pt).