Conductivities of Room Temperature Molten Salts Containing AlCl₃, Measured by a Computerized Direct Current Method

Abstract

The conductivities of the binary room-temperature molten salt systems AlCl3-yV-«-butylpyridinium chloride (BPC), AlCl3-l-ethyl-3-methylimidazolium chloride (EMIC) and AlCl3-benzyltriethylammonium chloride (BTEAC) have been measured at different temperatures and compositions by a d.c. fourprobes method.There is a maximum of the conductivity at 50 mol% A1C13 in the A1C13-BPC and A1C13-EMIC systems at 40 to 80 °C, their activation energies being relatively low (20.79 and 14.76 kJ/mol, respec tively). As to the A1C13-BTEAC system, there is an irregular change in the conductivity at 40-70 mol% A1C13 in the temperature range 50 to 80 °C. The conductivities of the three RTMS are in the order A1C13-EMIC > A1C13-BPC > A1C13-BTEAC, the reason being discussed.

Measuring and Enhancing the Ionic Conductivity of Chloroaluminate Electrolytes for Al-Ion Batteries

“…The difference in E a values suggests that we may be probing different phenomena (on different timescales) between the two conductivity measurements. Nonetheless, these activation energies are consistent with previous reports for similar ILAs demonstrating Arrhenius behavior. ,,,,,, Overall, we have demonstrated that the voltammetric-based conductivity measurement can be performed across a range of different measurement parameters.…”

“…Nonetheless, these activation energies are consistent with previous reports for similar ILAs demonstrating Arrhenius behavior. 17,29,35,42,44,63,64 Overall, we have demonstrated that the voltammetric-based conductivity measurement can be performed across a range of different measurement parameters. Effect of the Lewis Acid:Base Ratio.…”

“…The majority of reports with similar chloroaluminate electrolytes find a related trend in conductivity as a function of mole ratio, 17 , 29 , 31 , 44 , 64 where there is an optimal mole ratio to maximize conductivity for a particular electrolyte, yet some reports indicate that this trend may not always be the case. 14 , 25 , 45 To the best of our knowledge, formulations of chloroaluminate liquids >2.00:1 are not common.…”