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Issue 1, 2010

Valence electron energy-loss spectroscopy of silicon negative electrodes for lithium batteries

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Abstract

All compounds present in the lithiumsilicon binary phase diagram were synthesized and analyzed by electron energy-loss spectroscopy. In order to limit beam damage, and to develop a fast and local method of characterizing silicon negative electrodes, the valence energy-loss spectrum region was investigated, in particular the very intense plasmon peak in these alloys. Experimental spectra are in strong agreement with theoretical ones obtained from density functional theory. These results constitute a database for LixSi alloys’ plasmon energies. The method is applied to the study of the first discharge of a silicon electrode, thus identifying a Li2.9±0.3Si phase in equilibrium with Si on the voltage plateau. A nucleation process of this phase in the pristine Si is revealed, as well as a possible over-lithiation beyond the end of discharge Li15Si4 crystalline phase.

Graphical abstract: Valence electron energy-loss spectroscopy of silicon negative electrodes for lithium batteries

Supplementary files

Article information


Submitted
28 Jul 2009
Accepted
06 Oct 2009
First published
09 Nov 2009

Phys. Chem. Chem. Phys., 2010,12, 220-226
Article type
Paper

Valence electron energy-loss spectroscopy of silicon negative electrodes for lithium batteries

J. Danet, T. Brousse, K. Rasim, D. Guyomard and P. Moreau, Phys. Chem. Chem. Phys., 2010, 12, 220 DOI: 10.1039/B915245H

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