Abstract
Low-melting temperature ionic liquids (ILs), based on aliphatic quaternary ammonium N1xxx and 1-ethyl-3-methylimidazolium cations with the imide anion, were prepared and characterized. The physicochemical and electrochemical properties of these ILs, including melting point, degradation temperature, viscosity, density, ionic conductivity and electrochemical stability, were determined. The fluorinated imidazolium cation was also studied because of its better electrochemical stability compared to the non-fluorinated form. Due to the high viscosity of aliphatic ammonium based ILs, addition of an organic solvent to the ionic liquid was investigated and found to be without detriment to the interesting properties of ILs (i.e., nonvolatility, non-flammability, high thermal stability, electrochemical stability). The cycling performance of the mixtures IL–ethylene carbonate was characterized using LiMn2O4 based electrode materials in the voltage range of 3.5–4.3 V.
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