碳化硅衍生碳/球形天然石墨复合材料的制备及其结构调控

为满足储能领域对于材料兼具高能量密度和高功率密度的需求, 本文旨在将具有特殊孔隙结构的碳化物衍生碳与具有高导电性和高能量存储密度的石墨化碳(球形天然石墨)相复合, 制备得到一种多孔碳化硅衍生碳/球形天然石墨(SiC-CDCs@NG)复合材料. 采用X射线衍射(XRD)、扫描电子显微镜(SEM)、透射电子显微镜(TEM)、拉曼光谱、N₂吸/脱附等方法对材料的组成、结构、形貌、孔结构和比表面积等进行了表征. 结果表明,SiC-CDCs@NG材料具有较大的且可调节的比表面积和微孔体积, 微孔孔径集中在0.5-0.7 nm范围内; 通过改变NG/Si 摩尔比, 可以有效调控CDCs壳和NG核在复合材料中的组成分布、CDCs微孔的体积、孔径分布和比表面积.

Preparation and Structure Regulation of Silicon Carbide-Derived Carbon/ Spherical Natural Graphite Composites

To meet the requirements of the energy storage materials for high energy density and high power density, porous silicon carbide/derived carbon-spherical natural graphite (SiC-CDCs@NG) composites were prepared. The composites were composed of tailored porous carbide-derived carbon and graphitized carbon with excellent conductivity and a high energy storage capacity. The composition, structure, morphology, pore structure, and specific surface area of the composites were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), Raman spectroscopy, and N₂ adsorption/ desorption analysis. The composites exhibited a high and adjustable specific surface area and micro-pore volume, with a micro-pore size of between 0.5 and 0.7 nm. Varying the molar ratio of NG and Si allowed optimization of the micro-pore volume, pore size distribution, specific surface area, and composition and content of the CDCs shell and NG core.