Cathode active material for lithium secondary battery

摘要

Disclosed herein is a cathode active material based on lithium nickel-manganese-cobalt oxide represented by Formula 1, wherein an ion-conductive solid compound and conductive carbon are applied to a surface of the lithium nickel-manganese-cobalt oxide. A lithium secondary battery having the disclosed cathode active material has improved rate properties and high temperature stability, in turn embodying excellent cell performance.

主权项

1. A cathode active material, comprising:
cathode active material particles comprising lithium nickel-manganese-cobalt oxide represented by Formula (1), wherein a content of nickel is relatively higher than a content of manganese and cobalt, wherein the lithium nickel-manganese-cobalt oxide comprises a particle with an agglomerated structure consisting of an aggregate of microfine particles, and wherein an ion-conductive solid compound and conductive carbon are present as a coating on a surface of the particles by dry coating:
LixMyO2  (1) wherein M is Ni1-a-bMnaCOb (0.05≦a≦0.4, 0.1≦b≦0.4, 0.4≦(1-a-b)≦0.9), x+y is about 2 and 0.95≦x≦1.15.