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Alias, M., Crosnier, O., Sandu, I., Jestin, G., Papadimopoulos, A., Le Cras, F., Schleich, D. M. & Brousse, T. (2007) Silicon/graphite nanocomposite electrodes prepared by low pressure chemical vapor deposition. J. Power Sources, 174 900–904.
Added by: Laurent Cournède (2016-03-10 22:02:28) |
| Type de référence: Article DOI: 10.1016/j.jpowsour.2007.06.088 Numéro d'identification (ISBN etc.): 0378-7753 Clé BibTeX: Alias2007 Voir tous les détails bibliographiques  |
Catégories: ST2E Mots-clés: cells, Chemical vapor deposition, Coating, composite anodes, graphite, graphite negative electrodes, insertion, li, Lithium ion battery, Lithium-ion batteries, nano-silicon, negative electrode, performance, silicon Créateurs: Alias, Brousse, Crosnier, Jestin, Le Cras, Papadimopoulos, Sandu, Schleich Collection: J. Power Sources |
Consultations : 1/993
Indice de consultation : 7% Indice de popularité : 1.75% |
| Résumé |
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Silicon-coated carbon has been prepared by low pressure chemical vapor deposition (LPCVD) using silane as the precursor gas. A porous homogeneous layer made of spherical shaped particles was deposited. The average silicon particle diameter varied from 5 to 30 nm depending upon deposition conditions. Theoretical calculations have been performed to determine the capacity of graphite/silicon electrodes according to the shape of graphite flakes and to the thickness of the silicon layer. This calculation shows that even a minor amount of silicon is efficient in enhancing the capacity of the composite electrode. The electrochemical performance of carbon/silicon composite electrodes has been investigated by charge/discharge galvanostatic tests and cyclic voltammetry experiments. A small amount of silicon (3.6 wt\%) leads to an increase of the capacity of the graphite electrode (+27\%) without significant impact on the cyclability, thus combining the effect of both materials. Increasing the silicon content (10.7 wt\%) leads to an initial capacity of 780 mAh g(-1) but it strongly affects the cycling ability of the composite negative electrode. (c) 2007 Elsevier B.V. All rights reserved.
Added by: Laurent Cournède |