Synthesis, Physical Properties and Electrochemical Applications of Two Ionic Liquids Containing the Asymmetric (Fluoromethylsulfonyl)(Trifluoromethylsulfonyl)imide Anion

TitleSynthesis, Physical Properties and Electrochemical Applications of Two Ionic Liquids Containing the Asymmetric (Fluoromethylsulfonyl)(Trifluoromethylsulfonyl)imide Anion
Publication TypeArticolo su Rivista peer-reviewed
Year of Publication2022
AuthorsPalumbo, O., Appetecchi Giovanni Battista, Maresca G., Brubach J.-B., Roy P., Di Muzio S., Trequattrini F., Bordignon D., Legrand F., Falgayrat A., Lin R., Fantini S., and Paolone A.
JournalApplied Sciences (Switzerland)
Volume12
ISSN20763417
Abstract

Novel ionic liquid (IL) electrolytes based on the asymmetric (fluoromethyl-sulfonyl)(trifluoromethylsulfonyl)imide (FTFSI)− anion, combined with the N‐trimethyl‐N‐butyl‐ammonium (N1114)+ and N,N‐diethyl‐N‐methyl‐N(2‐methoxyethyl)‐ ammonium (N122(2O1))+ cations, were successfully synthesized and investigated in terms of thermal, vibrational and electrochemical properties. Thermogravimetric measurements revealed that the ionic liquids are stable up to 300 °C (2% mass loss). Differential scanning calorimetry measurements evidenced no phase transition down to −90 °C, suggesting a transition towards a glass state at lower temperatures. Infrared spectroscopy measurements, for the first time per-formed on ILs containing FTFSI, could not detect any crystallization down to −140 °C. The frequency of the main absorption bands of the ILs are in good agreement with DFT calculations. The FTFSI ionic liquid electrolytes, containing 20% mol of LiTFSI, show no solid‐liquid phase transition due to the asymmetry of the FTFSI− anion, increasing the −10 °C conductivity up to 10−4 S cm−1. These interesting ion transport properties remarkably extend the operative temperature range down to low temperatures. The FTFSI electrolytes exhibit remarkable electrochemical stability up to 4.8 V, this making them appealing for realizing safer and highly reliable lithium battery systems operating at high voltages. © 2022 by the authors. Licensee MDPI, Basel, Switzerland.

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URLhttps://www.scopus.com/inward/record.uri?eid=2-s2.0-85129726726&doi=10.3390%2fapp12094524&partnerID=40&md5=d599574306b49c0eee8a60c8ed5ce5f4
DOI10.3390/app12094524