Journal
APPLIED SURFACE SCIENCE
Volume 332, Issue -, Pages 192-197Publisher
ELSEVIER
DOI: 10.1016/j.apsusc.2015.01.099
Keywords
Sn@CNT; Core-shell; Controlled thickness; Li-ion battery
Categories
Funding
- National Science and Engineering Research Coundil (NSERC)
- General Motors of Canada
- Canada Research Chair (CRC) program
- Canadian Foundation for Innocation (CFI)
- University of Western Ontario
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Core-shell structure of Sn nanowires encapsulated in amorphous carbon nanotubes (Sn@CNTs) with controlled thickness of CNT shells was in situ prepared via chemical vapor deposition (CVD) method. The thickness of CNT shells was accurately controlled from 4 to 99 nm by using different growth time, flow rate of hydrocarbon gas (C2H4) and synthesis temperature. The microstructure and composition of the coaxial Sn@CNTs were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), and high resolution transmission electron microscopy (HRTEM) techniques. Moreover, the Sn@CNTs were studied as anode materials for Li-ion batteries and showed excellent cycle performance. The capacity was affected by the thickness of outer CNT shells: thick CNT shells contributed to a better retention while thin CNT shells led to a higher capacity. The thin CNT shell of 6 nm presented the highest capacity around 630 mAh g(-1). (C) 2015 Elsevier B.V. All rights reserved.
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