Abstract
Mixtures of ionic liquids (ILs) containing single-walled carbon nanotubes (SWCNTs) were prepared and characterized to obtain electrolytes with optimized transport properties for the use in energy storage devices such as supercapacitors. Imidazolium ILs bearing cations with side chains of different functionality coupled with bis(trifluoromethylsulfonyl)amide (NTf2 -) or bis(fluorosulfonyl)amide (FSA-) anions were used in mixtures containing up to 5 wt % SWCNTs. It was determined that the ionic conductivities of all ILs studied can be significantly increased with the addition of single-walled carbon nanotubes when the loading of the nanotubes is above 2 wt %. Moreover, higher conductivities were observed for the ILs containing the NTf2 - anion and 5 wt % SWCNTs. These results can significantly contribute to the development of improved energy storage devices. The work at Brookhaven National Laboratory was supported by the U.S. Department of Energy, Office of Basic Energy Sciences, Division of Chemical Sciences, Geosciences, and Biosciences under contract DE-SC0012704. The work at Brooklyn College was supported by the National Science Foundation, Solid State and Materials Chemistry Program, Division of Materials Research, EAGER award #1841398.
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