Patent ID: 8741482

Claim:
A mixed cathode active material comprising: a first cathode active material, comprising a lithium manganese oxide expressed as Chemical Formula 1 and a second cathode active material comprising a material expressed as Chemical Formula 2 having a plateau voltage profile in a range of about 2.5 V to about 3.3 V: a Li 2 MnO 3 .(1− a )Li x MO 2 [Chemical Formula 1] where 0<a<1, 0.9≦x≦1.2, and M is any one element or two or more elements selected from the group consisting of Al (aluminum), Mg (magnesium), Mn (manganese), Ni (nickel), Co (cobalt), Cr (chromium), V (vanadium), and Fe (iron) y MnO 2 .(1− y )Li 2 MnO 3 [Chemical Formula 2] where 0≦y≦1, wherein the mixed cathode active material is suitable for use in a lithium secondary battery, wherein the lithium secondary battery is suitable for a series-type plug-in hybrid electric vehicle (PHEV) or electric vehicle (EV), and wherein a power of the lithium secondary battery in a state of charge (SOC) range of about 10% to about 40% is about 20% or more of power at about 50% SOC.