Identification of Surface Films Formed on Lithium in Dimethoxyethane and Tetrahydrofuran Solutions

D. Aurbach, P. W. Faguy, E. Yeager

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155 Scopus citations

Abstract

Surface films formed on lithium metal in dimethoxyethane (DME) and tetrahydrofuran (THF) solutions of LiC104, LiAsF6, and LiSO3CF3were analyzed using FTIR, SIMS, and XPS spectroscopies. The films formed in both solvents were found to contain lithium alkoxides. The main reaction products detected with FTIR were LiOCH3 in DME, and LiO(CH2)3CH3 in THF. SIMS measurements are consistent with this finding. Reaction mechanisms are discussed. When the water concentration in these systems is 0.01M or greater, LiOH is formed on the lithium surface and appears to be a major component in the surface films. XPS measurements gave evidence for simultaneous salt reduction on the lithium surface in addition to the solvent reactions.

Original languageEnglish
Pages (from-to)1863-1871
Number of pages9
JournalJournal of the Electrochemical Society
Volume135
Issue number8
DOIs
StatePublished - Aug 1988

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