Electrochemical properties of imidazolium salt electrolytes for electrochemical capacitor applications
Journal Article
·
· Journal of the Electrochemical Society
- Covalent Associates, Inc., Woburn, MA (United States)
The specific ionic conductivity, dynamic viscosity, and electrochemical stability of several imidazolium salts are reported as neat ionic liquids and their solutions in several organic solvents. The temperature dependence of conductivity and viscosity are analyzed for 1-ethyl-3-methylimidazolium (EMI{sup +}) and 1,2-dimethyl-3-n-propylimidazolium (DMPI{sup +}) salts, and the influence of the anions bis(trifluoromethylsulfonyl)imide (Im{sup {minus}}), bis(perfluoroethylsulfonyl)imide (Beti{sup {minus}}), hexafluoroarsenate (AsF{sub 6}{sup {minus}}), hexafluorophosphate (PF{sub 6}{sup {minus}}), and tetrafluoroborate (BF{sub 4}{sup {minus}}) on these properties are discussed. These imidazolium salts make possible electrolytes with high concentration (>3 M), high room temperature conductivity (up to 60 mS/cm), and a wide window of stability (>4 V at 20 {micro}A/cm{sup 2}). Differential scanning calorimetric results confirm a large glass phase for the ionic liquids, with substantial (>80 C) supercooling. Thermal gravimetric results indicate the imidazolium salts with Im{sup {minus}} and Beti{sup {minus}} anions to be thermally more stable than the lithium salt analogs. The Vogel-Tammann-Fulcher interpretation accurately describes the conductivity temperature dependence.
- Sponsoring Organization:
- Department of Defense, Washington, DC (United States); USDOE, Washington, DC (United States)
- DOE Contract Number:
- FG02-96ER82149
- OSTI ID:
- 354411
- Journal Information:
- Journal of the Electrochemical Society, Journal Name: Journal of the Electrochemical Society Journal Issue: 5 Vol. 146; ISSN 0013-4651; ISSN JESOAN
- Country of Publication:
- United States
- Language:
- English
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