Fabrication of silicon oxide base powders for anode of lithium ion battery by hydrolysis flame synthesis

Abstract

SiOx based composite powders were fabricated by flame hydrolysis synthesis method employing an oxygen-hydrogen flame torch. The SiCl4 gas was used as a precursor and carried into the central tube of the torch by dry Ar gas. As-synthesized SiOx based composite powders had spherical shape with the size of about 30-40 nm. To control the structure of the incompletely oxidized SiOx based composite powders, the as-synthesized SiOx based composite powders were heat-treated under 5 % H2 and 95 % Ar mixed gas atmosphere at a temperature of 1000 °C to 1400 °C for 3h. The properties of as-synthesized and post heat-treated SiOx based composite powders at various temperatures were investigated by XRD, TEM, SEM, FT-IR and XPS analysis. And through the post-treatment effects, structural controlled the incomplete oxidized SiOx based composite powders. The formed particles in SiOx based powders had sphere shape and the size of 30 ~ 40 nm. TEM analysis revealed that the amorphous phase and crystalline phase were mixed in SiOx based composite powders by post-heat treatment. And the Si and SiO2 crystalline phases were detected in amorphous phase.