▎ 摘　　要

NOVELTY - An anode active material comprises a carbon-based particle and a coating layer bonded to at least a portion of a surface of the carbon-based particle, where the coating layer includes boron and a conductive material. USE - The anode active material is used for preparing lithium secondary battery (claimed) used as power source of mobile electronic device such as camcorder, mobile phone and laptop computer, and as power source of eco-friendly vehicle such as hybrid automobile. ADVANTAGE - The anode active material provides lithium secondary battery having improved operational stability and electrical property. The linear-type conductive material improves mechanical strength of the coating layer to prevent detachment of the coating layer, and an electron transfer path between particles is formed to improve power of the battery. The formation gas that may be generated during an initial formation may be removed or reduced so that a formation process may be simplified or omitted to improve productivity. The coating layer of anode material improves the capacity and cycle life-span of the battery while also increasing power of the battery. The coating layer may be stably fixed through an adhesion by melting and a chemical boning with functional groups on the surface of the anode active material, so that long-term life-span property of the battery may be improved. DETAILED DESCRIPTION - INDEPENDENT CLAIMS are included for the following: (1) a method of preparing an anode active material comprising preparing a carbon-based particle, preparing a coating solution by dispersing a boron source and a conductive material in a solvent, mixing the carbon-based particle and the coating solution to form a mixture and heat-treating the mixture; and (2) a lithium secondary battery comprising an anode comprising the anode active material for a lithium secondary battery and a cathode facing the anode.