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.
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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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