The thermal stability of Mg(AlPFTB4)2 was investigated by thermogravimetric analysis (TGA). FIG. 6 provides plots of sample weight versus temperature for Mg(THF)7(AlPFTB4)2, demonstrating thermal stability up to about 240° C. The analysis shows that the compound is stable until 150° C., after which the sample lost 5.7% of its weight (1.38 mg) from 150 and 210° C., and 7.19% (1.74 mg) from 210 to 240° C. Above 240° C., almost the entire mass was rapidly lost presumably via sublimation. While little is known about the possible chemical changes during sublimation, these results show that the compound was stable up to 240° C. without sublimation.
Ionic conductivities of solutions of Mg(AlPFTB4)2 in triglyme at various concentration were calculated from impedance values that were measured with AC impedance spectroscopy. FIG. 7 shows a plot of ionic conductivity versus concentration for Mg(AlPFTB4)2 in triglyme solvent. This analysis shows that the ionic conductivity initially increases with concentration, peaks at about 0.3 M, and then decreases thereafter. The maximum solubility of the compound in triglyme is 0.4 M. These results suggest that ion association occurs at concentration above 0.2 M in triglyme, which reduces the amount of free ions in the solution.
EXAMPLE 3
Exemplary Electrochemical Cell and Battery
