Synthesis and Characterization of 5‐Cyanotetrazolide‐Based Ionic Liquids |
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| Authors: | Timm Bergholz Dr Benjamin Oelkers Dr Benedikt Huber Prof Bernhard Roling Prof?Dr Jörg Sundermeyer |
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| Affiliation: | 1. Institute of Energy and Climate Research, Electrochemical Process Engineering (IEK 3), Forschungszentrum Jülich, Leo‐Brandt Strasse, 52425 Jülich (Germany);2. Department of Chemistry, Technische Universit?t Kaiserslautern, Erwin‐Schr?dinger‐Strasse Geb. 54, 67663 Kaiserslautern (Germany);3. Department of Chemistry, Philipps Universit?t Marburg, Hans‐Meerwein‐Strasse, 35032 Marburg (Germany) |
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| Abstract: | New salts based on imidazolium, pyrrolidinium, phosphonium, guanidinium, and ammonium cations together with the 5‐cyanotetrazolide anion C2N5]? are reported. Depending on the nature of cation–anion interactions, characterized by XRD, the ionic liquids (ILs) have a low viscosity and are liquid at room temperature or have higher melting temperatures. Thermogravimetric analysis, cyclic voltammetry, viscosimetry, and impedance spectroscopy display a thermal stability up to 230 °C, an electrochemical window of 4.5 V, a viscosity of 25 mPa s at 20 °C, and an ionic conductivity of 5.4 mS cm?1 at 20 °C for the IL 1‐butyl‐1‐methylpyrrolidinium 5‐cyanotetrazolide BMPyr]C2N5]. On the basis of these results, the synthesized compounds are promising electrolytes for lithium‐ion batteries. |
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| Keywords: | anions azides cations ionic liquids protonation |
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