Supercapacitors, also known as electrochemical double-layer capacitors (EDLCs), are relatively new type of energy storage devices with high specific power increasingly used in various fields of industry (from renewable energy to customer electronics). One of the main components of supercapacitor cell along with electrode materials is electrolyte. The key selection criteria suitability of the solution as an electrolyte is its good conductivity, wide electrochemical window and thermal stability. Under such criteria are better suited solutions of the tetraalkylammonium salts in organic solvents (e.g., acetonitrile) [1]. However the toxicity of the acetonitrile [2] pushes the scientists to look for an alternative.
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