Composite cathode active material for lithium secondary battery and a method of producing the same

A method of manufacturing a composite cathode active material, the composite cathode active material comprising a core part that enables intercalation and deintercalation of lithium and a shell part covering surfaces of the core part, the method comprising:

• preparing the core part;
• preparing raw materials for an alkali metal oxide of the shell part, wherein the alkali metal oxide comprises a substituent element substituted for a part of an alkali metal and having a greater oxidation number than the alkali metal;
• acquiring an intermediate by putting the core part and the raw materials into a solvent and agitating the core part and the raw materials in the solvent;
• drying the intermediate;
• and
• heat-treating the dried intermediate.

A method of manufacturing a composite cathode active material, the composite cathode active material comprising a core part that enables intercalation and deintercalation of lithium and a shell part covering surfaces of the core part and comprising an alkali metal oxide, the method comprising:

• preparing raw materials for the alkali metal oxide;
• acquiring a ground material by grinding the raw materials using a ball mill;
• acquiring the alkali metal oxide by heat-treating the ground material;
• and
• forming the shell part comprising the alkali metal oxide on the surfaces of the core part, wherein the alkali metal oxide comprises a substituent element substituted for a part of an alkali metal and having a greater oxidation number than the alkali metal.