Electrochemical properties of nonstoichiometric silicon suboxide anode materials with controlled oxygen concentration

Authors

Jaewoo Lee, University of WollongongFollow
Sanga Han, University of Wollongong, Sungkyunkwan UniversityFollow
Sang-Min Lee, Korea Electrotechnology Research Institute
Min-Sik Park, Kyung Hee University
Jung Ho Kim, University of Wollongong, Kyung Hee UniversityFollow

RIS ID

136655

Publication Details

Lee, J., Han, S. A., Lee, S., Park, M. & Kim, J. Ho. (2019). Electrochemical properties of nonstoichiometric silicon suboxide anode materials with controlled oxygen concentration. Composites Part B: Engineering, 174 107024-1-107024-7.

Abstract

Among the silicon (Si)-based anode materials, Si/SiOx is likely to be the best candidate for maintaining structural stability while taking advantage of the high capacity of Si as well as the compatible functionality between Si and SiOx. The oxygen content of SiOx is an especially significant factor for obtaining better performance, because it directly affects electrochemical properties such as reversible capacity, structural stability, and electrical conductivity. Herein, we have synthesized SiOx materials with different oxygen contents via magnesiothermic reduction of silica. The theoretical capacities of a series of Si/SiOx samples were estimated by using X-ray photoelectron spectroscopy, and then those results were compared with empirical results. This work paves the way to predicting the electrochemical performances of lithium-ion battery anodes based on oxygen content in the nonstoichiometric Si/SiOx structure.