Composite Cathode Active Material, Preparation Method Therefor, And Lithium Secondary Battery Comprising Same

Abstract: The present invention relates to a composite cathode active material, a preparation method therefor, and a lithium secondary battery comprising same, the material having an oxide-based solid electrolyte attached thereto so that conductivity, capacity, and output characteristics of a lithium secondary battery can be improved without deterioration of physical properties of the cathode active material itself. The composite cathode active material comprises: cathode active material particles; oxide-based solid electrolyte particles formed on the cathode active material particles; and a crosslinked polymer binder, wherein the oxide-based solid electrolyte particles can be attached to the surface of the cathode active material particles by means of the crosslinked polymer binder.

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