novel organic electrolytes comprising tetrafluoroborates and hexafluorophosphates of doubly charged cations of n , n - dialkyl - 1 , 4 - diazabicyclooctanediium are disclosed , which have general formula , where r is the alkyl c 1 - c 4 , and y 31 is a bf 4 − or pf 6 − anion . the invention also comprises a process for the preparation of said electrolytes comprising at least one compound of formula and the use of compounds of formula dissolved in an aprotic polar solvent or a mixture of such solvents as an electrolyte for an electrochemical double layer capacitor .