Synthesis of new fluorine-containing room temperature ionic liquids and their physical and electrochemical properties
| Autor: | Braja K. Mandal, Zheng Yue, Jim Tufts, Mei Xinyi, Hamza Dunya |
|---|---|
| Rok vydání: | 2018 |
| Předmět: |
Thermogravimetric analysis
Chemistry Organic Chemistry Inorganic chemistry 02 engineering and technology Electrolyte 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences Biochemistry Miscibility 0104 chemical sciences Inorganic Chemistry chemistry.chemical_compound Differential scanning calorimetry Ionic liquid Environmental Chemistry Ionic conductivity Thermal stability Physical and Theoretical Chemistry 0210 nano-technology Dicyanamide |
| Zdroj: | Journal of Fluorine Chemistry. 212:26-37 |
| ISSN: | 0022-1139 |
| DOI: | 10.1016/j.jfluchem.2018.05.008 |
| Popis: | An improved synthesis of fluorine-containing room temperature ionic liquids (FRTILs) is described. Twelve FRTILs are synthesized, in which the fluorinated cations based on N-methyl pyrrolidinium (MPy), 1-methly imidazolium (MIm) and diethylsulfide (DES) are associated with anions, such as dicyanamide (DCA) or bis(trifluoromethane sulfonyl)imide (TFSI). The molecular structures of these FRTILs were confirmed by FT-IR, 1H-NMR, 13C-NMR and elemental analysis. The FRTILs have been investigated for their potential as electrolyte solvents, especially for lithium-sulfur (Li-S) batteries. Thermal behaviors were also studied by thermogravimetric analysis (TGA) and differential scanning calorimetry (DSC) showing excellent thermal stability, exceeding 150 °C, for all FRTILs. Some of their physicochemical properties were determined, including density, flammability, viscosity, and miscibility with polar and nonpolar solvents. Due to the high viscosity of FRTILs, two low viscosity ILs (co-solvent thinners), [MImEt] [DCA] and [MImEt] [TFSI], have been synthesized and used to dilute the FRTILs. The resulting ternary electrolyte systems, LiTFSI in 1:1 wt.% FRTILs/thinner, were characterized by their ionic conductivity and electrochemical stability. |
| Databáze: | OpenAIRE |
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