Synthesis of Multiwalled Carbon Nanotubes That Are Both Filled and Coated by SnO2 Nanoparticles and Their High Performance in Lithium-Ion Batteries

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• 作者：Chaohe Xu ; Jing Sun ; Lian Gao
• 刊名：Journal of Physical Chemistry C
• 出版年：2009
• 出版时间：November 26, 2009
• 年：2009
• 卷：113
• 期：47
• 页码：20509-20513
• 全文大小：381K
• 年卷期：v.113,no.47(November 26, 2009)
• ISSN：1932-7455

文摘

Multiwalled carbon nanotubes (MWCNTs) filled and coated with SnO₂ nanoparticles (NPs) have been prepared using a simple one-step chemical solution method at 50 °C. The SnO₂/MWCNT hybrids were characterized by transmission electron microscopy and X-ray diffraction, and the formation mechanism has been discussed. The discharge capacities showed that MWCNTs coated and filled with SnO₂ had superior electrochemical performance. The first discharge capacities are 2127.4 and 1880.2 mAh/g at 70 and 200 mA/g and remain at 469 and 362 mAh/g after 40 cycles. Our results demonstrated that they had a better cycling performance at large discharge/charge current densities. The main reason is the huge volume expansion usually occurred in SnO₂ NPs during the Li⁺ insertion/extraction process has been prevented when they were filled into the cavities of MWNTs who have a superior mechanical properties.