Porous Silicon-Carbon Composite, Manufacturing Method Therefor, And Negative Electrode Active Material Comprising Same

A process for preparing a porous silicon-carbon composite, which comprises:

• a first step of obtaining a silicon composite oxide powder using a silicon-based raw material and a magnesium-based raw material;
• a second step of etching the silicon composite oxide powder using an etching solution comprising a fluorine (F) atom-containing compound;
• a third step of filtering and drying the composite obtained by the etching to obtain a porous silicon composite;
• and
• a fourth step of forming a carbon layer on the surface of the porous silicon composite by using a chemical thermal decomposition deposition method.