The use of binary mixtures of 1-butyl-1-methylpyrrolidinium bis{(trifluoromethyl)sulfonyl}imide and aliphatic nitrile solvents as electrolyte for supercapacitors

Christoph Schütter, Alex R. Neale, Patrick Wilde, Peter Goodrich, Christopher Hardacre, Stefano Passerini, Johan Jacquemin, Andrea Balducci

Research output: Contribution to journalArticlepeer-review

31 Citations (Scopus)
277 Downloads (Pure)

Abstract

Abstract The development of high voltage electrolytes is one of the key aspects for increasing both energy and power density of electrochemical double layer capacitors (EDLCs). The usage of blends of ionic liquids and organic solvents has been considered as a feasible strategy since these electrolytes combine high usable voltages and good transport properties at the same time. In this work, the ionic liquid 1-butyl-1-methylpyrrolidinium bis{(trifluoromethyl)sulfonyl}imide ([Pyrr14][TFSI]) was mixed with two nitrile-based organic solvents, namely butyronitrile and adiponitrile, and the resulting blends were investigated regarding their usage in electrochemical double layer capacitors. Both blends have a high electrochemical stability, which was confirmed by prolonged float tests at 3.2 V, as well as, good transport properties. In fact, the butyronitrile blend reaches a conductivity of 17.14 mS·cm−1 and a viscosity of 2.46 mPa·s at 20 °C, which is better than the state-of-the-art electrolyte (1 mol·dm−3 of tetraethylammonium tetrafluoroborate in propylene carbonate).
Original languageEnglish
Pages (from-to)146-155
Number of pages10
JournalElectrochimica Acta
Volume220
Early online date14 Oct 2016
DOIs
Publication statusEarly online date - 14 Oct 2016

Keywords

  • binary mixtures
  • ionic liquid
  • organic solvent
  • supercapacitor

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