Patent ID: 7816033

Claim:
A cathode active material for a lithium secondary battery, comprising a mixture of a lithium/manganese spinel oxide represented by Formula I below and a lithium/nickel/cobalt/manganese oxide represented by Formula II below: Li 1+x Mn 2−y M y O 4−z A z (I) Li 1+a Ni b Mn c Co 1−(b+c )O 2 (II) wherein, M is a metal having an oxidation number of 2 to 3; A is an anion having an oxidation number of −1 or −2; 0≦x≦0.2; 0≦y≦0.2; 0<z≦0.5; 0≦a≦0.1; 0.2≦b≦0.7; 0.2≦c≦0.7; and b+c< 1.