M. Diaw, A. Chagnes, B. Carré
Aug 26, 2005
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0
Influential Citations
126
Citations
Quality indicators
Journal
Journal of Power Sources
Abstract
Abstract Ionic liquids like 1-butyl-3-methylimidazolium tetrafluoroborate (IMIBF 4 ) or hexafluorophosphate (IMIPF 6 ) and 1-butyl-4-methylpyridinium tetrafluoroborate (PyBF 4 ) were mixed with organic solvents such as butyrolactone (BL) and acetonitrile (ACN). A lithium salt (LiBF 4 or LiPF 6 ) was added to these mixtures for possible application in the field of energy storage (batteries or supercapacitors). Viscosities, conductivities and electrochemical windows at a Pt electrode of these electrolytes were investigated. All studied electrolytes are stable toward oxidation and exhibit a vitreous phase transition, which has been determined by application of the VTF theory to conductivity measurements. Mixtures containing the BF 4 − anion exhibit the lowest viscosity and the highest conductivity. Two mixtures have been optimized in terms of conductivity: BL/IMIBF 4 (60/40, v/v) and ACN/IMIBF 4 (70/30, v/v).