Room-temperature phosphonium ionic liquids for supercapacitor application
[ 1 ] Instytut Chemii i Elektrochemii Technicznej, Wydział Technologii Chemicznej, Politechnika Poznańska | [ 2 ] Instytut Technologii i Inżynierii Chemicznej, Wydział Technologii Chemicznej, Politechnika Poznańska | [ P ] employee
2005
scientific article
english
- electrical properties and parameters
- carbon based materials
- electrolytes
- fuel cells
- ionic liquids
- supercapacitors
- batteries
- voltammetry
- chemical compounds
EN Ionic liquids (ILs) have been used as electrolytes for supercapacitors. Two phosphonium salts such as trihexyl(tetradecyl)phosphonium bis(trifluoromethylsulfonyl)imide (IL1) and trihexyl(tetradecyl) phosphonium dicyanamide (IL2) have been selected for this target. To decrease the viscosity of ILs, a small amount of acetonitrile (from 5 to 25 wt %) was added. Supercapacitor based on activated carbon (AC) as electrodes and IL1 with 25 wt % of acetonitrile supplied capacitance values of 100 F∕g at a high operating voltage of 3.4 V. Such a supercapacitor reached a high energy of ∼40 Wh∕kg and a good cyclability.
13.04.2005
article number: 164104
4,127