An Anode for Lithium-Ion Batteries Based on a Carbonaceous Silicon Oxycarbide (SiOC) Composite with High Electrochemical Performance

Anodes based on silicon oxycarbide (SiOCs) have attracted significant attention due to their outstanding theoretical capacity and structural stability. Their use in Li-Ion batteries is, however, challenged by their low electronic conductivity. The present study synthesized a SiOC composite containing graphene nanoplatelets (GNP) and rGO chemically modified graphene oxides. Both composites showed significant improvements in electrochemical performance. The conductivity of SiOC composite electrodes has been enhanced, ion diffusion lengths have been shortened, and charge-transfer resistance has been reduced. An approximately 1000 mA h/g capacity was obtained for SiOC-rGO composite at a current density of 0.37 A/g, significantly higher than that for SiOC. In addition, the composite anodes demonstrated a capacity of 700 mAh/g at 0.744 A/g after 800 cycles.