Electrochemical Properties of Chemically ProcessedSiOxas Coating Material in Lithium-Ion Batteries with Si Anode

Abstract

ASiOxcoating material for Si anode in lithium-ion battery was processed by using SiCl4and ethylene glycol. The producedSiOxparticles after heat treatment at 725°C for 1 h were porous and irregularly shaped with amorphous structure. Pitch carbon added toSiOxwas found to strongly affect solid electrolyte interphase stabilization and cyclic stability. When mixed with an optimal amount of 30 wt% pitch carbon, theSiOxshowed a high charge/discharge cyclic stability of about 97% for the 2nd to the 50th cycle. The initial specific capacity of theSiOxwas measured to be 1401 mAh/g. On the basis of the evaluation of theSiOxcoating material, the process utilized in this study is considered an efficient method to produceSiOxwith high performance in an economical way.