Evaluation of ionic liquids as electrolytes for vanadium redox flow batteries

L. Bahadori*, R. Boyd, A. Warrington, M. S. Shafeeyan, P. Nockemann

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

Non-aqueous redox flow batteries (NARFBs) are promising electrochemical energy storage devices due to their wide electrochemical potential windows, generally >2 V of organic solvents. This study aims to investigate the suitability of ionic liquids (ILs) as electrolytes for NARFBs containing a vanadium metal complex. The electrochemistry of a single-component NARFBs employing vanadium (III) acetylacetonate (V(acac)3) was studied in 1-butyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide, [C4mim][NTF2], and 1-butyl-1-methylpyrrolidinium bis(trifluoromethanesulfonyl)imide, [C4mpyr][NTF2], electrolytes. The electrochemical kinetics of the anodic and cathodic reactions was measured using cyclic voltammetry. The VII/VIII and VIII/VIV couples were quasi-reversible and together yielded a cell potential of 2.2 V in both ILs. Charge/discharge characteristics show that a coulombic efficiency for cycles 1–50 ranged from 88 to 92% using a V(acac)3/[C4mpyr][NTF2] cell.

Original languageEnglish
Article number114017
Number of pages6
JournalJournal of Molecular Liquids
Volume317
Early online date10 Aug 2020
DOIs
Publication statusPublished - 01 Nov 2020

Keywords

  • All-vanadium electrolyte
  • Electrochemistry
  • Ionic liquid
  • Non-aqueous electrolytes
  • Redox flow battery

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Atomic and Molecular Physics, and Optics
  • Condensed Matter Physics
  • Spectroscopy
  • Physical and Theoretical Chemistry
  • Materials Chemistry

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