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Decorated carbon nanotubes by silicon deposition in fluidized bed for Li-ion battery anodes

Coppey, Nicolas and Noé, Laure and Monthioux, Marc and Caussat, Brigitte Decorated carbon nanotubes by silicon deposition in fluidized bed for Li-ion battery anodes. ( In Press: 2013) Chemical Engineering Research and Design. ISSN 0263-8762

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Official URL: http://dx.doi.org/10.1016/j.cherd.2013.01.002

Abstract

Multi-walled carbon nanotubes Graphistrength® were decorated with silicon by Fluidized Bed Chemical Vapor Deposition. The ability to fluidize of these nanotubes forming ball-shaped jumbles of several hundreds of microns in diameter and that of the final CNT-Si balls was first studied. These balls reveal to fluidize with characteristics of Geldart’s group A particles, i.e. without bubbles and with high bed expansion. Coating experiments from silane SiH4 were performed at 500°C in the 30 60 wt. % range of silicon deposited. SEM and TEM imaging reveals that the nanotubes are coated by silicon nanoparticles uniformly distributed from the periphery to the center of the balls for the whole conditions tested. On-line acquisition of key process parameters evolution shows that the material remains fluidizable, even for large proportions of silicon deposited. The Sauter diameter and the tapped, untapped and skeleton densities of balls increase with the percentage of silicon deposited, whereas their specific surface area decreases due to the progressive filling of the pores by the deposit. This composite material is a promising candidate as anode to replace graphite in lithium-ion batteries.

Item Type:Article
Additional Information:Thanks to Elsevier editor. The original PDF of the article can be found at Chemical Engineering Research and Design website : http://www.sciencedirect.com/science/journal/02638762
Audience (journal):International peer-reviewed journal
Uncontrolled Keywords:
Institution:French research institutions > Centre National de la Recherche Scientifique - CNRS (FRANCE)
Université de Toulouse > Institut National Polytechnique de Toulouse - INPT (FRANCE)
Université de Toulouse > Institut National des Sciences Appliquées de Toulouse - INSA (FRANCE)
Université de Toulouse > Université Toulouse III - Paul Sabatier - UPS (FRANCE)
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Deposited By: Brigitte CAUSSAT-BONNANS
Deposited On:06 Sep 2013 08:51

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