Patent ID: 7670722
Filing Date: 2010-03-02
Classification: H01M,Y02E

Abstract:
1. A cathode active material for a lithium secondary battery, consisting of a mixture of a lithium/manganese spinel oxide represented by Formula I and a lithium/nickel/cobalt/manganese composite oxide represented by Formula II, wherein the lithium/manganese spinel oxide of Formula I and the lithium/nickel/cobalt/manganese composite oxide of Formula II have an average particle diameter of 15 μm to 30 μm, respectively: wherein, M is a metal having an oxidation number of 2 or 3; 0≦x≦0.2; 0≦y≦0.1; 0<z≦0.2; 0.2≦b≦0.7; 0.2≦c≦0.7; and b+c<1 and wherein the mixture of the lithium/manganese spinel oxide of Formula I and the lithium/nickel/cobalt/manganese composite oxide of Formula II is in the ratio of 30:70 to 70:30 by weight.