Room temperature ionic liquids: Versus organic solvents as lithium-oxygen battery electrolytes

E. Knipping, C. Aucher, G. Guirado, L. Aubouy

Research output: Contribution to journalArticleResearchpeer-review

12 Citations (Scopus)

Abstract

© 2018 The Royal Society of Chemistry and the Centre National de la Recherche Scientifique. Imidazolium, pyrrolidinium and piperidinium room temperature ionic liquids (RTILs) are characterized to evaluate their thermal stability, ionic conductivity, viscosity, potential window and lithium solvation, which are key parameters for lithium-oxygen (Li-O2) battery electrolytes. The electrochemical tests of these RTILs are also carried out in Li-O2 cells and show reasonable values of specific capacity, up to 1659 mA h per gram of carbon in the case of 1-propyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide (PMI TFSI) with a molar fraction of 0.2 of LiTFSI. RTILs are compared with conventional organic electrolytes like ethylene carbonate (EC)/diethyl carbonate (DEC) solution or tetraethylene glycol dimethyl ether (TEGDME), which enables us to provide a further insight into ways of improving the electrolyte properties of Li-O2 batteries. In particular, a viscosity lower than 100 cP combined with a lithium coordination number lower than 1.5 tends to enhance the battery performance.
Original languageEnglish
Pages (from-to)4693-4699
JournalNew Journal of Chemistry
Volume42
Issue number6
DOIs
Publication statusPublished - 1 Jan 2018

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