POSITIVE ACTIVE MATERIAL FOR RECHARGEABLE LITHIUM ION BATTERY, PREPARING METHOD OF THE SAME, AND RECHARGEABLE LITHIUM ION BATTERY COMPRISING THE SAME

The present disclosure relates to a positive electrode active material for rechargeable lithium ion batteries and a method of preparing the positive electrode active material, in which a compound including sulfur is used as an additive in a wet treatment process to remove residual lithium impurities (LiOH, LiCO) present on a surface of the positive electrode active material, such that the residual lithium impurities are effectively removed without loss of capacity while a Li-S compound coating layer is formed on the surface thereof, thereby reducing resistance and leakage current.