Abstract: The present disclosure provides a cathode active material comprising: lithium transition metal oxide-based particles; and a titanium dioxide coating layer formed on a part or a whole of a surface of the particle, in which the titanium dioxide coating layer is a partially reduced TiO2-x (0<x<2), a preparation method thereof, and a lithium secondary battery including the cathode active material. The cathode active material of the present disclosure may significantly improve electrochemical properties of an electrochemical device including the cathode active material, preferably a lithium secondary battery by decomposing lithium-containing impurities remaining on the surface of the cathode active material by a partially reduced titanium dioxide coating layer formed on the surface of the cathode active material and enhancing the electrical conductivity of the cathode active material.

Abstract: The present disclosure provides an anode active material for a secondary battery, including: a composite particle including silicon and a first carbon; and carbon nanotube (CNTs) directly grown on a surface of the composite particle, in which the composite particle is a metal catalyst-free type for synthesizing carbon nanotubes, and a preparation method thereof. The present disclosure may provide a novel metal composite-based anode active material having excellent cycle life characteristics and high capacity of a battery.