Method for preparing silicon powders using waste silicon sludge, silicon powders for preparing a secondary battery negative-electrode material, and system for preparing silicon powders

Abstract

Disclosed are a method for preparing silicon powders using waste silicon sludge, silicon powders for preparing a secondary battery negative-electrode material, and a system for preparing silicon powders. More specifically, disclosed are a method for preparing silicon powders by recovering and recycling (upcycling) waste silicon sludge produced in the solar power industry and semiconductor wafer production process as a useful resource, thereby efficiently preparing high-quality silicon powders that may be used as a negative-electrode material for an energy storage device, silicon powders for a secondary battery negative-electrode material as prepared by the method, and a system for preparing the silicon powders.

Dependencies are inferred from the claim text.