Graphite/Electrolyte Interface Formed in LiBOB-Based Electrolytes

The surface chemistry of graphitic anodes cycled in various lithium bis(oxalato)borate (LiBOB)-based electrolytes was studied by X-ray photoelectron spectroscopy, and a correlation was established between the C Is spectra and the participation of the BOB-anion. Through continuous removal of the semi...

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Bibliographic Details
Published in:Electrochemical and solid-state letters 2004, Vol.7 (9), p.A273-A277
Main Authors: Xu, Kang, Lee, Unchul, Zhang, Shengshui, Allen, Jan L., Jow, T. Richard
Format: Article
Language:English
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Summary:The surface chemistry of graphitic anodes cycled in various lithium bis(oxalato)borate (LiBOB)-based electrolytes was studied by X-ray photoelectron spectroscopy, and a correlation was established between the C Is spectra and the participation of the BOB-anion. Through continuous removal of the semicarbonate species by Ar+ bombardment, it was found that the main solid-electrolyte interface (SEI) ingredients come from two competing sources: the reduction products of cyclic carbonate and those of BOB- anion. Ethylene carbonate (EC) in electrolyte should control the initial surface chemistry owing to its higher reduction potential, while in EC-free solutions, BOB- anion is the main source of reduction products. The performances at elevated temperatures seem to require the coexistence of LiBOB and EC in electrolyte.
ISSN:1099-0062
DOI:10.1149/1.1774973