MIXED CATHODE ACTIVE MATERIAL HAVING IMPROVED OUTPUT CHARACTERISTICS AND LITHIUM SECONDARY BATTERY INCLUDING SAME

The present invention relates to a mixed cathode active material comprising lithium manganese oxide expressed by the following [formula 1] and a second cathode active material expressed by the following [formula 2], and to a lithium secondary battery including the mixed cathode active material; [Formula 1] aLiMnO·(1-a)LiMO where 0