▎ 摘　　要

Amorphous polymer-derived silicon-oxycarbide (SiOC) ceramicshavea high theoretical capacity and good structural stability, makingthem suitable anode materials for lithium-ion batteries. However,SiOC has low electronic conductivity, poor transport properties, lowinitial Couloumbic efficiency, and limited rate capability. Therefore,there is an urgent need to explore an efficient SiOC-based anode materialthat could mitigate the abovementioned limitations. In this study,we synthesized carbon-rich SiOC (SiOC-I) and silicon-rich SiOC (SiOC-II)and evaluated their elemental and structural characteristics usinga broad spectrum of characterization techniques. Li-ion cells werefabricated for the first time by pairing a buckypaper composed ofcarbon nanotubes with SiOC-I or SiOC-II as the anode. When mixed withgraphene nanoplatelets, the SiOC-II/GNP composites exhibited improvedelectrochemical performance. High specific capacity (average specificcapacity of 744 mAh/g at a 0.1C rate) was achieved with the compositeanode (25 wt % SiOC-II and 75% GNP), which was much better than thatof monolithic SiOC-I, SiOC-II, or GNPs. This composite also exhibitedexcellent cycling stability, achieving 344 mAh/g after 260 cyclesat a 0.5C rate and high reversibility. The enhanced electrochemicalperformance is attributed to better electronic conductivity, lowercharge-transfer resistance, and short ion diffusion length. Due totheir superior electrochemical performance, SiOC/GNP composites withCNT buckypaper as a current collector can be considered a promisinganode material for LiBs.