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Physicochemical and electrochemical investigations of the ionic liquid N-butyl -N-methyl-pyrrolidinium 4,5-dicyano-2-(trifluoromethyl) imidazole

Ochel, A; Di Lecce, D; Wolff, C; Kim, G-T; Carvalho, DV; Passerini, S; (2017) Physicochemical and electrochemical investigations of the ionic liquid N-butyl -N-methyl-pyrrolidinium 4,5-dicyano-2-(trifluoromethyl) imidazole. Electrochimica Acta , 232 pp. 586-595. 10.1016/j.electacta.2017.02.141. Green open access

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Abstract

A new ionic liquid formed by coupling 4,5-dicyano-2-(trifluoromethyl)imidazole (TDI−) anion with N-butyl -N-methyl-pyrrolidinium (Pyr14+) cation is successfully synthesized and characterized by Raman spectroscopy, thermal and rheological analyses, as well as electrochemical techniques. The Pyr14TDI-LiTDI mixture, melting at 49 °C, shows remarkable stability within the 50–250 °C range, as well as suitable ionic conductivity, lithium ion transport, and electrochemical stability window. Thus, it is proposed for application at 60 °C in a lithium cell with stable LiFePO4 cathode. At this temperature, the electrolyte has viscosity of 65.8 mPa s, ionic conductivity of the order of 5 mS cm−1, and limiting current density of 10−2 mA cm−2. Lithium metal/LiFePO4 cells with such an electrolyte offer promising results in terms of stable LiFePO4/electrolyte interface, investigated by impedance spectroscopy, as well as delivered capacity above 160 mAh g−1 with 81% of retention after 80 galvanostatic cycles.

Type: Article
Title: Physicochemical and electrochemical investigations of the ionic liquid N-butyl -N-methyl-pyrrolidinium 4,5-dicyano-2-(trifluoromethyl) imidazole
Open access status: An open access version is available from UCL Discovery
DOI: 10.1016/j.electacta.2017.02.141
Publisher version: http://doi.org/10.1016/j.electacta.2017.02.141
Language: English
Additional information: This version is the author accepted manuscript. For information on re-use, please refer to the publisher’s terms and conditions.
Keywords: Ionic liquid; PYR14TDI; LiTDI; LiFePO4; Lithium batteries
UCL classification: UCL
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science > Dept of Chemical Engineering
URI: https://discovery.ucl.ac.uk/id/eprint/10062228
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