Fritz Haber Institute of the Max Planck Society, Faradayweg 4-6, Berlin, Germany.
ChemSusChem. 2010 Mar 22;3(3):343-9. doi: 10.1002/cssc.200900131.
A comparative study of the electrochemical performances of carbon nanotubes and tube-in-tube carbon nanotubes reveals a dependence effect of lithium-ion storage behavior on the detailed nanostructure of carbon nanotubes. In particular, the impurity that graphitic particles or graphene fragments inherently present in carbon nanotubes plays a crucial role in the lithium-ion storage capacity of the carbon nanotubes. Compared to acid-washed carbon nanotubes, the assembly of graphitic impurity fragments in the tube-in-tube structures hinders lithium-ion diffusion, thus drastically decreasing the rate performance of lithium-ion storage. Significantly, our results indicate that the lithium-ion storage capacity of carbon nanotubes as anode electrodes can be improved or controlled by optimizing the microstructure composition of impurity graphitic nanoparticles or graphene fragments in the matrix of the carbon nanotubes.
一项关于碳纳米管和管中碳纳米管电化学性能的对比研究表明，锂离子存储行为对碳纳米管的详细纳米结构存在依赖关系。具体来说，碳纳米管中固有的石墨颗粒或石墨烯碎片杂质对碳纳米管的锂离子存储容量起着至关重要的作用。与酸处理后的碳纳米管相比，管中管结构中石墨杂质碎片的组装阻碍了锂离子的扩散，从而极大地降低了锂离子存储的倍率性能。重要的是，我们的研究结果表明，通过优化碳纳米管基体中杂质石墨纳米颗粒或石墨烯碎片的微观结构组成，可以改善或控制碳纳米管作为阳极电极的锂离子存储容量。
