Journal
APPLIED SURFACE SCIENCE
Volume 253, Issue 11, Pages 4895-4905Publisher
ELSEVIER
DOI: 10.1016/j.apsusc.2006.10.071
Keywords
XPS; core peaks; valence bands; lithium-ion batteries; solid electrolyte interphase
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The formation of a passivation film (solid electrolyte interphase, SEI) at the surface of the negative electrode of full LiCoO2/graphite lithiumion cells using different salts (LiBF4, LiPF6, LiTFSI, LiBETI) in carbonate solvents as electrolyte was investigated by X-ray photoelectron spectroscopy (XPS). The analyzes were carried out at different potential stages of the first cycle, showing the potential-dependent character ofthe surface film species formation and the specificity of each salt. At 3.8 V, for all salts, we have mainly identified carbonated species. Beyond this potential, the specific behavior of LiPF6 was identified with a high LiF deposit, whereas for other salts, the formation process of the SEI appears controlled by the solvent decomposition of the electrolyte. (c) 2006 Elsevier B.V. All rights reserved.
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