SURFACE TREATMENT METHOD OF CATHODE ACTIVE MATERIAL AND CATHODE ACTIVE MATERIAL FORMED THEREFROM

摘要

The surface processing method for anode active material particles according to the present invention comprises the steps of: (a) preparing an anode active material for a lithium rechargeable battery; (b) creating a plasma by using a gaseous material comprising at least one of a gas having fluorine (F) and a gas containing phosphorous (P) as at least part of a reaction gas; and (c) using the plasma to remove lithium impurities present on the surfaces of the particles constituting the anode active material. By reducing the amount of lithium impurities present on the surfaces of the anode active material particles the present invention makes it possible to suppress secondary reactions with the electrolytic solution.