Non-aqueous electrolytes based on onium ionic liquids for electrochemical capacitors

The research covers the synthesis of ionic liquids containing anions fluoroboric acid and quaternary ammonium cations with one ether group. The ionic conductivities of 1M solutions of the synthesized ionic liquids in acetonitrile were measured. They range from 27 to 36 mS/cm, which allows to use solutions as working electrolytes in electrochemical capacitors. It was found that the window of electrochemical stability of the investigated ionic liquids constitutes 3.6-6.1 V and depends on cation structure.


1. Yuyama K., Masuda G., Yoshida H., Sato T. // J. Power Sources. 2006. Vol. 162. P. 1401–1408.
2. Измайлова М. Ю., Рычагов А. Ю., Деньщиков К. К., Вольфкович Ю. М., Лозинская Е. И., Шаплов А. С. // Электрохимия. 2009. Т. 45, № 8. С. 1014–1015.
3. Sato T., Masuda G., Takagi K. // Electrochim. Acta. 2004. Vol. 49. P. 3603–3611.
4. Пат. 0094741 A1 US, C09K3/00. Ionic liquids, electrolyte salts for storage devices, electrolytic solution for storage device, electric double layer capacitor, and secondary battery.
5. Пат. 0031729 A1 US, H01M10/40, H01G9/035, H01G9/038. Ionic liquids, electrolyte salts for electrical storage devices, liquid electrolytes for electrical storage devices, electrical double-layer capacitors, and secondary batteries.
6. Вейганд-Хильгетаг. Методы эксперимента в органической химии. М.: Химия, 1968.
7. Пат. 3402115 US. Preparation of quaternary ammonium hydroxides by electrodialysis.
8. Ionic Liquids in Synthesis / ed. P. Wasserscheid, T. Welton. Weinheim: Wiley-VCH Verlag GmbH&Co. KGaA, 2002. P. 17.
9. Nockemann P., Binnemans K., Driesen K. // Chemical Physics Lett. 2005. Vol. 415. P. 131–136.
10. Galinski M., Lewandowski A., Stepniak I. // Electrochim. Acta. 2006. Vol. 51. P. 5567–5580.
11. Lewandowski A., Galinski M. // NATO Science Series. New Carbon Based Materials for Electrochemical Energy Storage Systems: Batteries, Supercapacitors and Fuel Cells. 2006. Vol. 229, № 1. P. 73–83.
12. Kurzweil P., Chwistek M. // Power Sources. 2008. Vol. 176. P. 555–567.