Abstract 3D interconnected mesoporous C/Si/SiO 2 composite was synthesized via two facile processes (including magnesiothermic reduction and CVD method) with the SBA-15 as Si source and CH 4 as carbon precursor. The micro/mesopores inside the Si/SiO 2 particles greatly increase the specific surface area, thus shortening the diffusion distance of lithium ions, electron and guaranteeing fast penetration of electrolyte. Raman spectra shows that the CVD derived carbon is partly graphitized, thus largely enhancing its conductivity. Si/SiO 2 coated with two-track carbon (both longitudinal and transverse) and Si/SiO 2 coated with single-track carbon are formed by only changing the experiment order. Such two-track C/Si/SiO 2 electrode for lithium-ion battery exhibits 63% higher capacity than the single-track C/Si/SiO 2 electrode at high-rate performance, attributed to the fast electrochemical reaction kinetics and electron transport rendered by the conductive 3D interconnected structure. This functional structure can effectively accommodate the volume expansion of Si/SiO 2 and maintain the electrical connection between electrode and active materials, improving the cycling stability of active materials.

中文翻译：

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3D 互连介孔 Si/SiO 2 涂覆有 CVD 衍生的碳作为锂离子电池的高级负极材料

摘要 以SBA-15为Si源，CH 4 为碳前驱体，通过两种简便的工艺（包括镁热还原法和CVD法）合成了3D互连介孔C/Si/SiO 2 复合材料。Si/SiO 2 颗粒内部的微孔/介孔大大增加了比表面积，从而缩短了锂离子、电子的扩散距离，保证了电解液的快速渗透。拉曼光谱显示 CVD 衍生的碳部分石墨化，从而大大提高了其导电性。仅改变实验顺序即可形成双轨碳包覆的Si/SiO 2 (纵向和横向)和单轨碳包覆的Si/SiO 2 。这种用于锂离子电池的双轨C/Si/SiO 2 电极在高倍率性能下的容量比单轨C/Si/SiO 2 电极高63%，归因于导电 3D 互连结构提供的快速电化学反应动力学和电子传输。这种功能结构可以有效地容纳Si/SiO 2 的体积膨胀，保持电极与活性材料之间的电连接，提高活性材料的循环稳定性。