Enhanced Lithium Ion Storage Property of Sn Nanoparticles: The Confinement Effect of Few-Walled Carbon Nanotubes

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• 作者：Hongkun Zhang ; Huaihe Song ; Xiaohong Chen ; Jisheng Zhou
• 刊名：The Journal of Physical Chemistry C
• 出版年：2012
• 出版时间：November 1, 2012
• 年：2012
• 卷：116
• 期：43
• 页码：22774-22779
• 全文大小：386K
• 年卷期：v.116,no.43(November 1, 2012)
• ISSN：1932-7455

文摘

The confinement of Sn nanoparticles inside few-walled carbon nanotubes and its effect on lithium ion storage property have been investigated in detail. It was found that the charge transfer and electronic interaction facilitated Sn to remain in a more reduced state and to link strongly with interior surface of carbon nanotubes by Sn鈥揅 bonds, leading to a high reversible capacity of 732 mAh g^鈥? and capacity retention of 639.7 mAh g^鈥? after 170 cycles at 50 mA g^鈥?. We also found that the volume restriction inside CNTs protected Sn鈥揅 bonds against breakage during lithium insertion/extraction, contributing to the excellent cycling performance with the fade rate of only 0.074% per cycle.