Method for manufacturing porous silicon and secondary battery anode active material containing same

Abstract

A porous silicon manufacturing method according to the present invention comprises the steps of: pretreating a silicon precursor and a heat dispersant; and conducting a thermal reduction reaction between the heat dispersant-pretreated silicon precursor and a metal reducing agent by using a rotary reaction chamber. When porous silicon manufactured by the manufacturing method is contained in a secondary battery anode active material and used in secondary batteries, the batteries exhibit high capacity and long lifespan characteristics. The present invention relates to a method for manufacturing porous silicon and a method for manufacturing a secondary battery anode active material containing the porous silicon manufactured thereby, with the aim of solving the problems with silicon materials under development for anode active materials for lithium secondary batteries, including excessive volume expansion during charge/discharge and resultant electrode fracture and lifespan shortening.

Dependencies are inferred from the claim text.