Silicon/graphite nanocomposite electrodes prepared by low pressure chemical vapor deposition - Archive ouverte HAL Access content directly
Journal Articles Journal of Power Sources Year : 2007

Silicon/graphite nanocomposite electrodes prepared by low pressure chemical vapor deposition

(1, 2) , (2) , (2, 3, 4) , (2) , (2) , (1) , (2) , (2)
1
2
3
4

Abstract

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.

Dates and versions

cea-00658925 , version 1 (11-01-2012)

Identifiers

Cite

Mélanie Alias, Olivier Crosnier, Izabela Sandu, Gwenolé Jestin, Alexandre Papadimopoulos, et al.. Silicon/graphite nanocomposite electrodes prepared by low pressure chemical vapor deposition. Journal of Power Sources, 2007, 174 (2), pp.900-904. ⟨10.1016/j.jpowsour.2007.06.088⟩. ⟨cea-00658925⟩
222 View
0 Download

Altmetric

Share

Gmail Facebook Twitter LinkedIn More