PERFORMANCE OF CARBON SUPERCAPACITORS USING ROOM TEMPERATURE IONIC LIQUID ELECTROLYTES

摘要

The performance of selected RTIL's as electrolytes in carbon supercapacitors was evaluated and compared to conventional electrolytes. The ESR of the cell relates well to the conductivity of electrolyte. The relationship between the ESR with the electrolyte resistivity (1/conductivity) was found to be strong, while the relationship with the electrolyte viscosity was slightly weaker. The 1M- Et_4NBF_4/AN electrolyte consistently gave the lowest cell ESR over the temperature range investigated and the temperature dependence of ESR, for the Et_4NBF_4/AN electrolyte, was relatively small.Whilst several RTIL's have been identified that show comparable, or better performance at temperatures above 20°C, the low temperature performance of RTIL based supercapacitors is currently limited and requires further optimization. That being said, RTIL based supercapacitors are a viable solution for energy applications that are exposed to high operating temperatures.