title: The effect of the anion fraction on the physicochemical properties of EMIm(HF)nF (n = 1.0-2.6).
abstract: A series of molten salts EMIm(HF)nF's with different n values has been synthesized by the reaction of EMImHF(2) and anhydrous hydrogen fluoride. The salts contain EMIm cation and some oligomeric fluorohydrogenate anions, (HF)nF-, of which the fraction changes with the change of n. A phase diagram of EMIm(HF)nF's (n = 1.0-2.6) has been constructed which suggests the presence of the stoichiometric compounds, EMIm(HF)1.5F and EMIm(HF)2F, in this range. Compared to the EMIm(HF)2.3F previously reported, EMIm(HF)nF's (n = 1.8-2.0) possess wider liquid temperature ranges because of their similar melting points and superior thermal stabilities at elevated temperatures. The electrochemical windows of EMIm(HF)nF's (n = 1.0-2.6) falls in the range of 2.9-3.4 V. The conductivity of EMIm(HF)nF's (n = 1.0-2.6) increases with the increase of n.
authors.affiliation: Graduate School of Energy Science, Kyoto University, Sakyo-ku, Kyoto 606-8501, Japan. hagiwara@energy.kyoto-u.ac.jp
authors.forename: Rika
authors.initials: R
authors.lastname: Hagiwara
authors.forename: Yoji
authors.initials: Y
authors.lastname: Nakamori
authors.forename: Kazuhiko
authors.initials: K
authors.lastname: Matsumoto
authors.forename: Yasuhiko
authors.initials: Y
authors.lastname: Ito