Structure and Lithium Insertion Properties of Carbon Nanotubes
Structure and Lithium Insertion Properties of Carbon Nanotubes
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DOI：
10.1149/1.1391828
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发表时间：
1999-05
影响因子：
3.9
通讯作者：
G. Wu;Chunsheng Wang;X. B. Zhang;Hangsheng Yang;Z. Qi;P. He;Wencheng Li
中科院分区：
文献类型：
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作者：
G. Wu;Chunsheng Wang;X. B. Zhang;Hangsheng Yang;Z. Qi;P. He;Wencheng Li
碳纳米管是由乙炔或乙烯在铁或氧化铁纳米颗粒催化下裂解而得到的。通过透射电子显微镜、高分辨透射电子显微镜、X射线衍射、拉曼光谱和电化学测试等手段对碳纳米管的形貌、微观结构和嵌锂性能进行了研究。结果表明，碳纳米管的结构对比容量和循环寿命都有重要影响。轻微石墨化的碳纳米管在第一次充电期间显示640 mAh/g的比容量，而良好石墨化的碳纳米管在第一次充电期间显示282 mAh/g的比容量。经过20次充放电循环后，轻度石墨化样品的充电容量下降到其原始充电容量的65.3%，而石墨化良好的样品保持其原始充电容量的91.5%。讨论了充放电速率和循环温度对不同石墨化程度碳纳米管嵌锂性能的影响。
Carbon nanotubes were obtained by pyrolysis of acetylene or ethylene catalyzed by iron or iron oxide nanoparticles. The morphology, microstructure, and lithium insertion properties of these carbon nanotubes were investigated by transmission electron microscopy, high-resolution transmission electron microscopy, X-ray diffraction, Raman spectroscopy, and electrochemical measurements, respectively. The results showed that the structures of the carbon nanotubes play major roles in both specific capacity and cycle life. Slightly graphitized carbon nanotubes showed a specific capacity of 640 mAh/g during the first charge, whereas well-graphitized carbon nanotubes showed a specific capacity of 282 mAh/g during the first charge. After 20 charge/discharge cycles the charge capacity of the slightly graphitized samples degraded to 65.3% of their original charge capacities, but the well-graphitized samples maintained 91.5% of their original charge capacities. The effects of charge-discharge rates and cycling temperature on lithium insertion properties of carbon nanotubes with different extents of graphitization are discussed.