Heat Capacities of 1-Methyl-3-Ethylimidazolium Chloride-Aluminum Chloride Molten Salts.

摘要

The addition of aluminum chloride to 1-methyl-3-ethylimidazolium chloride results in the formation of a room temperature molten salt. This ionic liquid has shown to be a useful electrolyte for battery applications. In practical situations, batteries are often subjected to extremes in temperatures, knowledge of the electrolytes' basic thermal properties, such as melting point, decomposition temperature and heat capacity, may help to predict how a battery containing the electrolyte of interest will behave under such conditions. The molar heat capacity, C(p) is defined as the amount of heat needed to raise the temperature of one mole of a substance by one kelvin. It is a measure of a systems ability to store heat through the vibrational and rotational motion of chemical bonds and through the translational motion of atoms and molecules in the system. A standard method for the determination of heat capacities using differential scanning calorimetry is described. The heat capacities for the molten salt system aluminum chloride 1-methyl-3-ethylimidazolium chloride were determined over the composition range 0.30<N<0.65 where N is the apparent mole fraction of aluminum chloride. (AW)