ceramics for example using non woven glass the separator 126 can include main fibers and binder fibers each having a fiber diameter smaller than that of each of the main fibers and allowing the main fibers to be bonded together once the edlc 100 is fabricated it may be used in high temperature applications with little or no leakage current the edlc 100 described herein can operate efficiently at temperatures from u2212 20 c to 300 c with leakage currents normalized over the volume of the device less than 1 amp per liter a l of volume of the device within the entire operating voltage and temperature range one key to this performance at u2212 20 c to 300 c with leakage currents less than 1 a l is the assembly process itself which produces a finished edlc 100 having a moisture concentration in the electrolyte of less than 500 parts per million ppm over the weight and volume of the electrolyte and an amount of impurities less than 1000 ppm more specifically the activated carbon carbon fibers rayon carbon cloth and or nanotubes making up the two electrodes 112 114 is dried at an elevated temperature in a vacuum environment the separator 126 may be dried at elevated temperature in a vacuum environment the electrolyte 124 may be dried at elevated temperature in a vacuum environment once the electrodes 112 114 the separator 126 and electrolyte 124 are dried under vacuum they are packaged without a final seal or cap in an atmosphere with less than 50 parts per million ppm of water the uncapped edlc 100 may be dried under vacuum over a temperature range of about 100 c to about 300 c once this final drying is complete the edlc 100.