Cathode active material for lithium secondary battery, method for preparing the same, and lithium secondary battery including the same

Abstract

The present invention relates to a cathode active material for a lithium secondary battery having excellent performance, a method for preparing the same, and a lithium secondary battery including the same, and by forming a lithium-metal-oxygen (Li-M-O) layer by atomic layer deposition (ALD) and then forming a lithium-metal-oxygen-fluorine (Li-M-O—F) protection layer through vapor phase fluorination treatment, it is possible to uniformly coat not only the surface of the cathode active material but also the grain boundaries inside the active material, thereby improving high voltage stability and long-term lifespan characteristics of an all-solid-state battery.

Dependencies are inferred from the claim text.