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Fluidized Bed Chemical Vapor Deposition of Silicon on Carbon Nanotubes for Li-Ion Batteries

Coppey, Nicolas and Noé, Laure and Monthioux, Marc and Caussat, Brigitte Fluidized Bed Chemical Vapor Deposition of Silicon on Carbon Nanotubes for Li-Ion Batteries. (2011) Journal of Nanoscience and Nanotechnology, vol. 11 (n° 9). pp. 8392-8395. ISSN 1533-4880

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Official URL: http://dx.doi.org/10.1166/jnn.2011.5078

Abstract

Silicon was deposited on balls of entangled multi-walled carbon nanotubes (CNT) with a mean diameter of several hundred microns, by Fluidized Bed Chemical Vapor Deposition from silane (SiH4). The weight total percentage of deposited silicon was between 30 and 70%, to test their efficacy in Li-ion battery anodes. TEM and SEM imaging revealed that silicon deposits were of the form of nanoparticles uniformly dispersed on the whole CNT surface. The diameter of these nanoparticles increases with the deposited silicon percentage from 18 to 36 nm whereas their density remains constant at 5 1022 nanoparticles/g of CNT. This indicates a low affinity of chemical species born from silane pyrolysis with the CNT surface for nucleation. The increase of the silicon nanoparticles diameter leads to the decrease of the specific surface area and the porous volume of the balls, probably due to the filling of the pores of the CNT network by silicon. A slight increase of the mean diameter of the balls was observed for the two highest silicon percentages, certainly due to the ability of the CNT network to be deformed under the mechanical stress induced by the silicon nanoparticles growth.

Item Type:Article
Additional Information:Thanks to American Scientific Publishers (ASP) editor. The definitive version is available at http://www.ingentaconnect.com/content/asp/jnn/2011/00000011/00000009/art00136
Audience (journal):International peer-reviewed journal
Uncontrolled Keywords:
Institution:French research institutions > Centre National de la Recherche Scientifique - CNRS
Université de Toulouse > Institut National Polytechnique de Toulouse - INPT
Université de Toulouse > Université Paul Sabatier-Toulouse III - UPS
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Deposited By:Brigitte CAUSSAT-BONNANS

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