Morpholinium-based ionic liquid mixtures as electrolytes in electrochemical double layer capacitors

Original Paper


Butyl-Methyl-Morpholinium bis(trifluoromethanesulphonyl)imide [ButMetMor][TFSI] and Ethyl-Methyl-Morpholinum bis(trifluoromethanesulphonyl)imide [EtMetMor][TFSI] and their mixtures with propylene carbonate (PC) were investigated as potential electrolytes in an electrochemical double layer capacitor (EDLC). Temperature dependencies of conductivity and electrochemical stability windows of ionic liquids (ILs) as well as their mixtures were determined. PC mixtures give higher conductivity with maximum ca. 1:4 (IL:PC) molar rate. Temperature dependencies of conductivity follow the Arrhenius type, showing higher energy activation for neat ILs rather than for mixtures. The EDLC was constructed based on activated carbon cloth (ACC, Kynol®) ca. 2000 m2 g−1 and IL:PC mixture giving specific capacitance of ca. 100–120 F g−1.


Room temperature ionic liquid Morpholinium ionic liquid Electrolyte conductivity Electrochemical double layer capacitor (EDLC) 



Etyl-Methyl-Morpholinium bis(trifluoromethanesulphonyl)imide


Butyl-Methyl-Morpholinium bis(trifluoromethanesulphonyl)imide


Electrochemical double layer capacitor


Propylene carbonate






Differential scanning calorimetry



This study was supported by grant KBN 31-1240/T08/2005.


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Copyright information

© Springer Science+Business Media B.V. 2009

Authors and Affiliations

  1. 1.Faculty of Chemical TechnologyPoznan University of TechnologyPoznanPoland

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