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Updated: Apr 24, 2026

Synthesis of Ionic Liquid Based Electrolytes, Assembly of Li-ion Batteries, and Measurements of Performance at High Temperature
Published on: December 20, 2016
New water-stable ionic liquids based on tetrakis-(2,2,2-trifluoroethoxy)borate
Alexander B A Rupp1, Petra Klose, Harald Scherer
1Institut für Anorganische und Analytische Chemie, Albert-Ludwigs-Universität, Albertstraße 21, 79104 Freiburg (Germany); Freiburger Materialforschungszentrum, Stefan-Meier-Straße 21, 79104 Freiburg (Germany).
Abstract:
Several new ionic liquids (ILs) were prepared from Na[B(tfe)4] (tfe=OCH2 CF3 ) via metathesis, including one room temperature IL (RTIL). Prior to synthesis, suitable cations were chosen via predictive quantum-chemical calculations. Nuclear magnetic resonance monitoring over almost a month showed a total stability of the anion in the presence of water. The temperature-dependent viscosities and melting points of all the new ILs were determined. The data indicate that [B(tfe)4 ](-) ILs may be too viscous for electrochemical applications, but are interesting candidates for lubricant research.
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