以二茂铁为铁源,石油渣油为碳源,通过加压热解和空气氧化制备了碳包覆空心Fe3O4纳米粒子。采用X射线衍射（XRD）、透射电镜（TEM）以及高倍透射电镜（HRTEM）等测试方法对样品的形貌和结构进行表征。采用恒流充放电和交流阻抗方法测试碳包覆空心Fe3O4纳米粒子作为锂离子电池负极材料的电化学性能。在电流密度为0.2mA/cm2时,首次放电比容量高达1294.7mAh/g,30次循环之后其放电比容量为392.1mAh/g;电流密度为1mA/cm2时,首次放电比容量为216.3mAh/g,30次循环之后其放电比容量为113mAh/g。
Carbon encapsulated hollow Fe3O4 nanoparticles have been successfully synthesized via co-carbonization and oxidation in the air. The morphologies and structural features of the sample were investigated by X-ray diffraction （XRD）,transmission electron microscope （TEM） and high-resolution TEM （HRTEM）. The electrochemical performance testing showed that the first reversible specific capacity of the carbon encapsulated hollow Fe304 nanoparticles was as high as 1294.7mAh/g at a current density of 0.2mA/cm2. After 30 cycles the reversible specific capacity was still maintained at 392. lmAh/g. Even at a high current density of lmA/cm2 , the first reversible specific capacity was 216.3mAh/g and remained at 113mAh/g after 30 cycles.
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