Abstract: The present invention relates to a silicon-carbon composite, a method for manufacturing same, and an anode active material comprising same. The silicon-carbon composite is a silicon-carbon composite including silicon particles and carbon. As the molar ratio of oxygen (O) atoms to silicon (Si) atoms in the silicon-carbon composite satisfies 0.05 to 0.45, when the silicon-carbon composite is applied to an anode active material, the discharge capacity, initial efficiency, and capacity retention ratio after cycles of a lithium secondary battery can be simultaneously improved.

Abstract: The present invention provides a porous silicon-carbon composite, a manufacturing method therefor, and a negative electrode active material comprising same. Since the porous silicon-carbon composite of the present invention includes silicon particles, magnesium fluoride, and carbon, the initial efficiency and capacity retention ratio of a secondary battery can be further increased as well as the discharge capacity thereof.

Abstract: The present invention provides a silicon-silicon composite oxide-carbon composite, a method for preparing same, and a negative electrode active material for a lithium secondary battery, comprising same. More particularly, the silicon-silicon composite oxide-carbon composite of the present invention has a core-shell structure wherein the core comprises silicon, a silicon oxide compound, and magnesium silicate, and the shell comprises a carbon layer. In addition, by having a specific range of span values through the adjustment of particle size distribution of the composite, when used as a negative electrode active material of a secondary battery, the composite can improve not only the capacity of the secondary battery but also the cycle characteristics and initial efficiency thereof.