Chemical–physical properties of bis(perfluoroalkylsulfonyl)imide-based ionic liquids

Minimizing Artifacts in Three-electrode Double Layer Capacitance Measurements Caused by Stray Capacitances

“…Two-electrode and three-electrode impedance measurements were performed on a solution of lithium bis(trifluoromethane)sulfonylimide (LiTFSI, Sigma-Aldrich, purity: 99.95%) in 1-butyl-1-methylpyrrolidinium bis(trifluoromethane)sulfonylimide (Pyr 1,4 TFSI) with a molar ratio LiTFSI:Pyr 1,4 TFSI of 1:4.5. The ionic liquid (IL) was synthesized and purified by Passerini et al by means of a method described in [18,19] and was dried at a pressure of 10 À6 mbar at elevated temperatures of 50-80 C. The water content of the IL was less than 15 ppm as measured by KarlFischer titration (Mettler-Toledo, C20Coulometric Karl-FischerTitrator). The temperature was varied between 10 C and 50 C. The cell was connected to an Alpha high-performance impedance analyzer combined with a POTGAL 10 V/15A electrochemical The WE is made of gold coated onto mica, the CE is a gold-coated stainless steel electrode, and the RE is a gold wire.…”

GREENLION Project: Advanced Manufacturing Processes for Low Cost Greener Li-Ion Batteries

“…For instance, N-methyl-N-propylpyrrolidinium bis(fluorosulfonyl)imide (PYR 13 FSI) was found to exhibit moderate viscosity and low melting point, allowing fast ion conduction even at low temperatures [10]. On other hand, the much cheaper N-methyl-N-propylpyrrolidinium bis(trifluoromethanesulfonyl)imide (PYR 13 TFSI) shows wider thermal and electrochemical stability [11]. In order to verify if these characteristics could be combined, PYR 13 FSI-PYR 13 TFSI mixtures were prepared and investigated in terms of NMR spectroscopy, transport properties and density measurements.…”

Quantum design of ionic liquids for extreme chemical inertness and a new theory of the glass transition

“…We note in particular the work of Appetecchi et al, who screened a number of hydrophobic ionic liquids for use as electrolytes in supercapacitors and lithium batteries [9]. Their work involved a combination of bis(perfluoroalkylsulfonyl)imide anions and a variety of different cations.…”