A new ionic liquid formed by coupling 4,5-dicyano-2-(trifluoromethyl)imidazole (TDIâ) 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 50â250 °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 LiFePO4cathode. At this temperature, the electrolyte has viscosity of 65.8 mPa s, ionic conductivity of the order of 5 mS cmâ1, and limiting current density of 10â2 mA cmâ2. Lithium metal/LiFePO4cells 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 gâ1with 81% of retention after 80 galvanostatic cycles.
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Data di pubblicazione: | 2017 | |
Titolo: | Physicochemical and electrochemical investigations of the ionic liquid N-butyl -N-methyl-pyrrolidinium 4,5-dicyano-2-(trifluoromethyl)imidazole | |
Autori: | Ochel, Anders; Di Lecce, Daniele; Wolff, Christian; Kim, Guk-Tae; Carvalho, Diogo Vieira; Passerini, Stefano | |
Rivista: | ELECTROCHIMICA ACTA | |
Parole Chiave: | Ionic liquid; LiFePO4; LiTDI; Lithium batteries; PYR14TDI; Chemical Engineering (all); Electrochemistry | |
Abstract in inglese: | A new ionic liquid formed by coupling 4,5-dicyano-2-(trifluoromethyl)imidazole (TDIâ) 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 50â250 °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 LiFePO4cathode. At this temperature, the electrolyte has viscosity of 65.8 mPa s, ionic conductivity of the order of 5 mS cmâ1, and limiting current density of 10â2 mA cmâ2. Lithium metal/LiFePO4cells 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 gâ1with 81% of retention after 80 galvanostatic cycles. | |
Digital Object Identifier (DOI): | 10.1016/j.electacta.2017.02.141 | |
Handle: | http://hdl.handle.net/11392/2385943 | |
Appare nelle tipologie: | 03.1 Articolo su rivista |