Composite positive electrode active material for lithium secondary battery, method of preparing same, and lithium secondary battery containing positive electrode including same

Abstract

A composite positive electrode active material for a lithium secondary battery, the composite positive electrode active material including: a lithium cobalt oxide particle; and a particle coating portion in a form of an island and on a first surface of the lithium cobalt oxide particle, the particle coating portion including a first coating layer including a lithium titanium oxide, wherein the lithium cobalt oxide particle includes a lithium-deficient cobalt oxide phase positioned between the particle coating portion and a core of the lithium cobalt oxide particle, the lithium-deficient cobalt oxide phase having a molar ratio of lithium to cobalt of about 0.9 or less, and a surface coating portion located between a second surface of the lithium cobalt oxide particle and the core of the lithium cobalt oxide particle.

Dependencies are inferred from the claim text.