Synthesis of new fluorine-containing room temperature ionic liquids and their physical and electrochemical properties
By Mei, Xinyi; Yue, Zheng; Tufts, Jim; Dunya, Hamza; Mandal, Braja K.
Published in Journal of Fluorine Chemistry
2018
Abstract
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
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