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Nonaqueous Electrolytes for Electrochemical Capacitors: Imidazolium Cations and Inorganic Fluorides with Organic Carbonates
Abstract
Electrolytes based on 1‐ethyl‐3‐methylimidazolium cation ( EMI + ) and either the hexafluorophosphate ( EMIPF 6 ) or tetrafluorborate ( EMIBF 4 ) anion in organic alkyl carbonate solvents have been evaluated for use in electrochemical capacitors The conductivity capacitance, limiting oxidation and reduction potentials, and thermal stability were assessed. High conductivity and capacitance values were found regardless of whether cyclic (high viscosity/high dielectric constant) or acyclic (low viscosity/low dielectric constant) alkyl carbonates were used. The best correlation with conductivity for the EMIPF 6 salt was found to be the molecular weight (κ ∝ 1/Mw) and to a lesser degree the viscosity (κ ∝ 1/η) of the solvent. The high specific capacitance (130 F/g) and excellent stability (>3.5 V, >130°C) make these electrolytes well suited for use in electrochemical double‐layer capacitors.
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Cited by
Deep eutectic solvents: syntheses, properties and applications
Zhang, Q., De Oliveira Vigier, K., Royer, S., & Jérôme, F. (2012) · Chemical Society Reviews · doi:10.1039/c2cs35178a · Cited by 4,899
Thermal properties of imidazolium ionic liquids
Ngo, H. L., LeCompte, K., Hargens, L., & McEwen, A. B. (2000) · Thermochimica Acta · doi:10.1016/s0040-6031(00)00373-7 · Cited by 1,050
Self-citationIshikawa, M., Sugimoto, T., Kikuta, M., Ishiko, E., & Kono, M. (2006) · Journal of Power Sources · doi:10.1016/j.jpowsour.2006.02.077 · Cited by 549
Temperature dependence of viscosity for room temperature ionic liquids
Okoturo, O. O., & VanderNoot, T. J. (2004) · Journal of Electroanalytical Chemistry · doi:10.1016/j.jelechem.2003.12.050 · Cited by 417
Metadata
- Authors
- McEwen, A. B., McDevitt, S. F., & Koch, V. R.
- Venue
- Journal of The Electrochemical Society
- Publisher
- The Electrochemical Society
- Published
- 1997-04-01
- Volume
- 144
- Issue
- 4
- Pages
- L84-L86
- ISSN
- 0013-4651 (ISSN-L)
- 1945-7111
- OpenAlex
- W1993992414
- Cited by
- 199
- References
- 0
- FWCI
- 2.09
- Type
- journal article
- Language
- en
- Open access
- closed
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- CoChat. (2026). Citation check: Nonaqueous Electrolytes for Electrochemical Capacitors: Imidazolium Cations and Inorganic Fluorides with Organic Carbonates. https://app.cochat.ai/papers/10.1149/1.1837561
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- McEwen, A. B., McDevitt, S. F., & Koch, V. R. (1997). Nonaqueous Electrolytes for Electrochemical Capacitors: Imidazolium Cations and Inorganic Fluorides with Organic Carbonates. Journal of The Electrochemical Society. https://doi.org/10.1149/1.1837561
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