On the challenge of electrolyte solutions for Li-air batteries: Monitoring oxygen reduction and related reactions in polyether solutions by spectroscopy and EQCM

Daniel Sharon, Vinodkumar Etacheri, Arnd Garsuch, Michal Afri, Aryeh A. Frimer, Doron Aurbach*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

141 Scopus citations

Abstract

Polyether solvents are considered interesting and important candidates for Li-O2 battery systems. Discharge of Li-O2 battery systems forms Li oxides. Their mechanism of formation is complex. The stability of most relevant polar aprotic solvents toward these Li oxides is questionable. Specially high surface area carbon electrodes were developed for the present work. In this study, several spectroscopic tools and in situ measurements using electrochemical quartz crystal microbalance (EQCM) were employed to explore the discharge-charge processes and related side reactions in Li-O2 battery systems containing electrolyte solutions based on triglyme/lithium bis(trifluoromethanesulfonyl)imide (LiTFSI) electrolyte solutions. The systematic mechanism of lithium oxides formation was monitored. A combination of Fourier transform infrared (FTIR), NMR, and matrix-assisted laser desorption/ionization (MALDI) measurements in conjunction with electrochemical studies demonstrated the intrinsic instability and incompatibility of polyether solvents for Li-air batteries.

Original languageAmerican English
Pages (from-to)127-131
Number of pages5
JournalJournal of Physical Chemistry Letters
Volume4
Issue number1
DOIs
StatePublished - 3 Jan 2013
Externally publishedYes

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