Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
6471931 | Electrochimica Acta | 2017 | 10 Pages |
â¢Synthesis of the new ionic liquid, Pyr14TDI.â¢Thermal and electrochemical properties of Pyr14TDI-LiTDI.â¢Pyr14TDI-LiTDI mixture as electrolyte for lithium battery application.â¢Performance of Li/Pyr14TDI-LiTDI/LiFePO4 cells.
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 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 cmâ1, and limiting current density of 10â2 mA cmâ2. 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 gâ1 with 81% of retention after 80 galvanostatic cycles.