Propionitrile as a single organic solvent for high voltage electric double-layer capacitors

Hoai Van T. Nguyen, Abdullah Bin Faheem, Kyungwon Kwak, Kyung Koo Lee

Research output: Contribution to journalArticle

Abstract

This study investigates the novel use of propionitrile (PN) as the single organic solvent for high-voltage carbon/carbon capacitors. Quaternary ammonium salts spiro-(1,1ʹ)-bipyrrolidinium tetrafluoroborate (SBPBF4) and 1,1-dimethylpyrrolidinium tetrafluoroborate (DMPBF4) dissolved in acetonitrile (AN) and propionitrile (PN) are compared. PN-based electrolytes exhibit a large and symmetric electrochemical stability, an exceptional anodic potential limit, good ionic conductivity, and low viscosity, allowing EDLCs to operate at 3.5 V even with a high current density (2.5 A g−1). Moreover, PN-based electrolytes can suppress the anodic dissolution of the Al current collector at a high potential. These advantages help in the realization of EDLCs with excellent cycling stabilities at high voltages. As a result, at 3.5 V, EDLCs with PN-based electrolytes exhibit the highest energy and power density of 49.3 Wh kg−1 and 22.9 kW kg−1, respectively. Therefore, the electrolyte systems reported here could be a promising electrolyte candidate to replace currently commercialized electrolytes for practical applications.

Original languageEnglish
Article number228134
JournalJournal of Power Sources
Volume463
DOIs
Publication statusPublished - 2020 Jul 1

Keywords

  • 1,1-Dimethylpyrrolidinium tetrafluoroborate
  • Cycle stability
  • Electric double-layer capacitor
  • High-voltage
  • Propionitrile

ASJC Scopus subject areas

  • Renewable Energy, Sustainability and the Environment
  • Energy Engineering and Power Technology
  • Physical and Theoretical Chemistry
  • Electrical and Electronic Engineering

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