Cathode active material for lithium secondary battery, method of fabricating the same, and lithium secondary battery including the same

Abstract

Provided are a cathode active material for a lithium secondary battery, a method of fabricating the same, and a lithium secondary battery including the same. The cathode active material includes a lithium composite transition metal oxide represented by Li1+(c-a)/2NiaCobMncO2-xFx (0.1≦c−a≦0.4, 0.13≦a≦0.3, 0.03≦b≦0.2, 0.4≦c≦0.6, (a+b+c)+(1+(c−a)/2)=2, 0<x≦0.15, 1≦a/b≦6, 1.9≦c/a≦4.0, and 0.04≦b/(a+b+c)≦0.25), and layer-structured Li2MnO3. Since the lithium secondary battery including the cathode active material has a large capacity and generates less gas, lifespan characteristics and high rate capability are significantly improved, and especially voltage variation during charging and discharging operations is small.

Dependencies are inferred from the claim text.