Instability of Ionic Liquid-Based Electrolytes in Li−O2 Batteries

Supti Das, Jonathan Højberg, Kristian Bastholm Knudsen, Reza Younesi, Patrik Johansson, Poul Norby, Tejs Vegge

Research output: Contribution to journalJournal articleResearchpeer-review

Abstract

Ionic liquids (ILs) have been proposed as promising solvents for Li−air battery electrolytes. Here, several ILs have been investigated using differential electrochemical mass spectrometry (DEMS) to investigate the electrochemical stability in a Li−O2 system, by means of quantitative determination of the rechargeability (OER/ORR), and thereby the Coulombic efficiency of discharge and charge. None of the IL-based electrolytes are found to behave as needed for a functional Li−O2 battery but perform better than commonly used organic solvents. Also the extent of rechargeability/reversibility has been found to be strongly dependent on the choice of IL cation and anion as well as various impurities.
Original languageEnglish
JournalThe Journal of Physical Chemistry Part C
Volume119
Issue number32
Pages (from-to)18084–18090
Number of pages7
ISSN1932-7447
DOIs
Publication statusPublished - 2015

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