Cathode active material for lithium secondary battery including sulfurized coating layer and method of manufacturing same

A cathode active material for a lithium secondary battery, the cathode active material comprising:

• a core component comprising a lithium transition metal oxide;
• a first layer disposed on the core component, comprising an alkali metal oxide represented by LiaMbO(a+c)/2, where M is at least one element selected from the group consisting of niobium (Nb), boron (B), phosphorus (P), tungsten (W), titanium (Ti), tantalum (Ta), tin (Sn), zirconium (Zr), and combinations thereof, and wherein a and b satisfy 1≤a≤10 and 1≤b≤10, and c is the oxidation number of M;
• and
• a second layer disposed on the first layer, comprising a sulfur component, wherein the sulfur component in the coating layer comprises an anion selected from the group consisting of S−, HS−, SO−, SO2−, SO3−, and combinations thereof, and a cation selected from the group consisting of lithium (Li), nickel (Ni), cobalt (Co), manganese (Mn), iron (Fe), aluminum (Al), and combinations thereof.

A method of manufacturing a cathode active material for a lithium secondary battery, the method comprising:

• preparing a core component comprising a lithium transition metal oxide;
• and
• forming a coating layer on the core component,
• wherein the coating layer comprises a sulfur component.