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An XPS/AES comparative study of the surface behaviour of nano-silicon anodes for Li-ion batteries

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Journal of Analytical Atomic Spectrometry Vol - 29 Issue - 5

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An XPS/AES comparative study of the surface behaviour of nano-silicon anodes for Li-ion batteries

Content Provider	Royal Society of Chemistry (RSC)
Author	Porcher, Willy Vito, Eric De Radvanyi, Etienne Larbi, Séverine Jouanneau Si
Copyright Year	2014
Abstract	In this paper, the surface of composite electrodes made of nano-silicon is studied by using two surface characterization techniques: X-ray Photoelectron Spectroscopy (XPS) and Auger Electron Spectroscopy (AES). Several electrodes were analyzed at different States Of Charge (SOC) during the first electrochemical cycle. Firstly, the Solid Electrolyte Interphase (SEI) as well as the Si oxides present at the particle surface were thoroughly investigated. The behaviour of the SEI is close to that which forms on graphite: (i) its composition is similar and (ii) its thickness is greater at the lithiated state. Besides, our AES analyses carried out at the end of the first electrochemical cycle demonstrate that this behaviour strongly depends on the material it forms on: silicon or carbon fibers. Concerning SiO2, which is initially present at the Si particles' surface, it is reduced irreversibly during the first lithiation. Simultaneously, our results clearly show the formation of Li2O and LixSiOy; these species are still observed during the aging of the electrode and systematically react at each cycle. Secondly, by using AES combined with a sputtering technique, the first lithium insertion and the associated LixSi alloys were studied: several Si particles were investigated individually with respect to their electrode environment. After a capacity of 360 mA h g−1, the estimated Li concentration is different from one Si particle to another indicating that the first lithiation is a strongly heterogeneous process.
Starting Page	1120
Ending Page	1131
Page Count	12
File Format	HTM / HTML PDF
ISSN	02679477
Volume Number	29
Issue Number	6
Journal	Journal of Analytical Atomic Spectrometry
DOI	10.1039/c3ja50362c
Language	English
Publisher	Royal Society of Chemistry
Access Restriction	Open
Subject Keyword	Auger Electron Spectroscopy Solid Electrolyte Interphase AES Li X-ray crystallography Auger electron spectroscopy Electrochemistry Electrolyte Interphase Graphite Carbon Electrode Sputtering Lithium
Content Type	Text
Resource Type	Article
Subject	Spectroscopy Analytical Chemistry

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Controlling Li Dendritic Growth in Graphite Anodes by Potassium Electrolyte Additives for Li-Ion Batteries.

Auger Electrons as Probes for Composite Micro- and Nano- structured Materials: Application to Solid Electrolyte Interphases in Graphite and Silicon-Graphite Electrodes

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An XPS/AES comparative study of the surface behaviour of nano-silicon anodes for Li-ion batteries

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An XPS/AES comparative study of the surface behaviour of nano-silicon anodes for Li-ion batteries