碳纳米管的电化学贮锂性能研究

Characteristics of Electrochemical Storage Lithium of CarbonNanotubes

以纳米镍粉为催化剂,热分解法制备了碳纳米管.应用X射线衍射对碳纳米管的结构进行了研究,透射电子显微镜观察了碳纳米管的形貌.碳纳米管的直径在15nm左右,长>100nm,d002为0.338nm.在结构上,纳米碳管具有与石墨类似的良好规整性,具有较高的可石墨化度,又具有纳米级的孔径,因此具有良好的贮锂性能.对碳纳米管的充放电性能研究结果表明,碳纳米管初始放电比容量为654mAh/g,高于纯石墨的理论容量372mAh/g,循环性能较好.

Carbon nanotubes were produced by catalytic thermal decomposition using metal Ni nanopartical as catalyst. X-ray diffraction and transmission electron microscope were used to determine the size and morphology of carbon nanotubes. The results show that carbon nanotubes are 20similar to30nm in diameter and longer than 100nm with a high order degree of graphitization. There are a large amount of nanochannels lead to higher specific capacity. The carbon nanotubes exhibit a high electrochemical storage lithium capacity, being 654mAh/g at first cycle and having a good cycling stability.