The use of binary mixtures of 1-butyl-1-methylpyrrolidinium bis{(trifluoromethyl)sulfonyl}imide and aliphatic nitrile solvents as electrolyte for supercapacitors


Schütter, C, Neale, AR ORCID: 0000-0001-7675-5432, Wilde, P, Goodrich, P, Hardacre, C, Passerini, S, Jacquemin, J and Balducci, A (2016) The use of binary mixtures of 1-butyl-1-methylpyrrolidinium bis{(trifluoromethyl)sulfonyl}imide and aliphatic nitrile solvents as electrolyte for supercapacitors Electrochimica Acta, 220. pp. 146-155. ISSN 0013-4686, 1873-3859

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Abstract

The development of high voltage electrolytes is one of the key aspects for increasing both energy and power density of electrochemical double layer capacitors (EDLCs). The usage of blends of ionic liquids and organic solvents has been considered as a feasible strategy since these electrolytes combine high usable voltages and good transport properties at the same time. In this work, the ionic liquid 1-butyl-1-methylpyrrolidinium bis{(trifluoromethyl)sulfonyl}imide ([Pyrr<inf>14</inf>][TFSI]) was mixed with two nitrile-based organic solvents, namely butyronitrile and adiponitrile, and the resulting blends were investigated regarding their usage in electrochemical double layer capacitors. Both blends have a high electrochemical stability, which was confirmed by prolonged float tests at 3.2 V, as well as, good transport properties. In fact, the butyronitrile blend reaches a conductivity of 17.14 mS·cm−1 and a viscosity of 2.46 mPa·s at 20 °C, which is better than the state-of-the-art electrolyte (1 mol·dm−3 of tetraethylammonium tetrafluoroborate in propylene carbonate).

Item Type: Article
Uncontrolled Keywords: binary mixtures, ionic liquid, organic solvent, supercapacitor
Depositing User: Symplectic Admin
Date Deposited: 09 Dec 2019 17:36
Last Modified: 01 Mar 2026 01:49
DOI: 10.1016/j.electacta.2016.10.088
Open Access URL: https://doi.org/10.1016/j.electacta.2016.10.088
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URI: https://livrepository.liverpool.ac.uk/id/eprint/3065635
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