Structural characterization and electrochemical lithium insertion properties of carbon nanotubes prepared by the catalytic decomposition of methane |
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| Authors: | Guo-Tao Wu Mao-Hui Chen Guang-Ming Zhu Jin-Kua You Zu-Geng Lin Xiao-Bin Zhang |
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| Institution: | (1) State Key Laboratory for Physical Chemistry of Solid Surfaces and Department of Chemistry, Xiamen University, Xiamen, 361005, P.R. China,;(2) Department of Materials Science and Engineering, Zhejiang University, Hangzhou, 310027, P.R. China, |
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| Abstract: | Carbon nanotubes (CNTs) were synthesized by the catalytic decomposition of methane at 773, 873 and 973 K. Structures of these
carbon nanotubes were characterized by TEM, HRTEM, XRD and Raman spectra, respectively. The results showed that with the increase
of preparation temperature, the d
002 value of the CNTs decreased, while the L
a
values and the degree of crystallinity of the samples increased. Electrochemical lithium insertion properties of the CNTs
used as positive electrodes in CNTs/Li cells were also investigated. The first charge capacities of CNTs/Li cells were 290,
254 and 202 mAh/g for samples produced at 773, 873 and 973 K, respectively. The sample from 773 K showed a larger charge capacity,
which is attributed to the accommodation of lithium at microcavities, at edges of graphitic layers and at the surface of single
graphitic layers. Its potential hysteresis during Li insertion and deinsertion processes may be related to the interstitial
carbon atoms.
Electronic Publication |
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| Keywords: | Carbon nanotubes Catalytic decomposition Methane Lithium ion batteries |
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