▎ 摘　　要

NOVELTY - The anode active material has a silicon oxide that is provided with a carbon coating layer formed on a surface of the silicon oxide and doped with magnesium. The ratio of the peak area at 1303 eV to a sum of a peak area at 1304.5 eV and a peak area at 1303 eV appearing in a Mg1s spectrum when measured by X-ray photoelectron spectroscopy (XPS) is 60% or less. The content of magnesium hydroxide remaining on the surface is less than 0.05 wt.% based on the total weight of the silica. The content of magnesium hydroxide remaining on the surface is 0 wt.% or more or less than 0.05 wt.% based on the total weight of the silica. The content of the doped magnesium is 7-17 wt.% based on the total weight of the silicon oxide. The carbon content in the coating layer is in the range of 3-12 wt.% based on the total weight of the silicon oxide. The carbon of the coating layer comprises amorphous carbon, carbon nanofibers, carbon nanotubes, graphite, graphene, graphene oxide, and reduced graphene oxide. USE - Anode active material for lithium secondary battery (claimed) such as lithium secondary battery, nickel-cadmium battery, and nickel-hydrogen battery developed and used as power source for environmentally friendly vehicle such as hybrid vehicle, and used as power source for portable electronic communication devices such as camcorder, cellular phone, and notebook personal computer with development of information communication and display industries. ADVANTAGE - The anode active material for lithium secondary battery has high energy density and excellent stability in electrode manufacture. The stability during preparation of the anode active material slurry can be secured. The anode active material slurry can have a pH maintained in a low range of 10 or less to prevent the slurry viscosity from being reduced and by ensuring a viscosity of 4,000 centipoise or more, and can be helpful to ensure the stability of the slurry. The anode active material slurry with excellent stability can provide excellent uniformity during the manufacture of the anode. The anode active material for a secondary battery can implement a lithium secondary battery with high energy density properties and excellent electrochemical properties. DESCRIPTION OF DRAWING(S) - The drawings show the schematic diagrams illustrating the slurries containing anode active materials, and the coated electrodes. (Drawing includes non-English language text)