Thermophysical Characterization of TFSI Based Ionic Liquid and Lithium Salt Mixtures
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Thermophysical Characterization of TFSI Based Ionic Liquid and Lithium Salt MixturesAuthor(s)
Date
2019-11-14Citation
Fernández-Miguez, L.; Vallet, P.; Tasende-Rodríguez, L.C.; Doval, A.; Villanueva, M.; Cabeza, Ó.; Varela, L.M.; Salgado, J.; Parajó, J.J. Thermophysical Characterization of TFSI Based Ionic Liquid and Lithium Salt Mixtures. Proceedings 2019, 41, 57. https://doi.org/10.3390/ecsoc-23-06618
Abstract
[Abstract] The ionic liquids (ILs) doped with metal salts have become a real alternative as electrolytes for batteries, but the right choice of these compounds for reaching the adequate properties and performance is still a challenge, and strategies are therefore needed for achieving it. The thermophysical properties of IL 1-butyl-1-methylpyrrolidinium bis[(trifluoromethyl)sulfonyl]imide ([bmpyr] [TFSI]) and its mixture with bis-(trifluoromethane)-sulfonimide lithium salt (from 0.1 m to saturation level) were determined in this work. These properties are density (ρ), speed of sound (U), and corresponding derived magnitudes, such as the bulk modulus and the thermal coefficient, as well as electrical conductivity (σ) against temperature. Density shows a linear decreasing dependence with temperature and a clear increase with the addition of salt, whereas the thermal expansion coefficient increases with temperature and salt addition. Speed of sound decreases with both temperature and salt concentration, and the adiabatic compressibility calculated by means of the well-known Laplace equation increases, as expected, with temperature in all the studied cases, although a small variation with concentration was observed. Electrical conductivity increases with temperature following the Vogel–Fulcher–Tammann (VFT) equation and decreases with the addition of salt.
Keywords
Ionic liquids
Density
Speed of sound
Electrical conductivity
Density
Speed of sound
Electrical conductivity
Description
Este artigo pertence ás actas do The 23rd International Electronic Conference on Synthetic Organic Chemistry.
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Rights
Atribución 4.0 Internacional (CC BY)
ISSN
2504-3900