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Friday, July 26

Properties of Phosphonium-Based Ionic Liquids and
the Electrochemical Applications

Katsuhiko Tsunashima, Argonne National Laboratory, Argonne, Ill.
Chemical Sciences Division Seminar
10:00 AM — 11:00 AM, Chemical and Material Sciences Building (4100), Room C-301
Contact: Sheng Dai (, 865.576.7307


Room-temperature ionic liquids (RTILs) have been developed for a wide variety of applications due to their unique physicochemical properties such as favorable solubility of organic and inorganic compounds, relatively high ionic conductivity, no measurable vapor pressure, high thermal stability, low flammability, etc. Many studies on RTILs have been associated with nitrogen-based cations; however, interests in RTILs based on quaternary phosphonium cations have been increasing in recent years. Our research group has designed a variety of quaternary phosphonium cations derived from triethylphosphine and tributylphosphine, and have synthesized the phosphonium RTILs in combination with various anions. I will discuss how the phosphonium RTILs are different from other kinds of RTILs in view of physicochemical and electrochemical properties such as viscosity, conductivity, thermal and electrochemical stabilities. I will also present some of our recent results on electrochemical applications to lithium battery and dye-sensitized solar cell electrolytes.