Effect of different carbon precursor and deposition temperature on properties of SiOx@C electrode

초록

With the escalating demand for large-scale batteries, particularly for use in electric vehicles (EVs) and energy storage systems (ESS), silicon has emerged as a promising nextgeneration anode material due to its high theoretical capacity of 4,200 mAh g -1 . However, despite its potential, silicon has not yet been able to effectively replace carbonaceous anodes due to its low electrical conductivity and significant volume expansion during the charge and discharge process. Current research is tackling this issue by coating the surface of silicon with a carbon layer. However, there is a lack of comprehensive research evaluating the properties of this carbon layer based on the type of precursor and coating temperature. In this study, we used chemical vapor deposition (CVD) to deposit a carbon layer onto the surface of SiOx, using either methane or acetylene as carbon precursors. We optimized the carbon coating process at various deposition temperatures based on property evaluations. The morphology and thickness of the carbon layer were assessed using transmission electron microscopy (TEM). In addition, we analyzed the composition and crystallinity using X-ray diffraction (XRD) and Raman spectroscopy. Finally, we evaluated the electrochemical performance of the Si-based anode materials by fabricating lithium-ion battery electrode halfcells.