COMPOSIT CATHODE ACTIVE MATERIAL, PREPARATION METHOD THEREOF, AND CATHODE AND LITHIUM BATTERY CONTAINING THE COMPOSITE CATHODE ACTIVE MATERIAL

摘要

Provided are a composite positive electrode active material, a producing method thereof, a positive electrode comprising the same, and a lithium battery. The composite positive electrode active material comprises nickel-based lithium transition metal oxide second particles, and a coating membrane containing lithium and cobalt on a surface of first particles in the nickel-based lithium transition metal oxide second particles.