Supercapacitors are of great benefit for numerous markets particularly automotive, consumer electronics and storage systems for the grid, which require highly reliable energy sources with good power delivery. As a pulse power source, supercapacitors constitute a great supplement to batteries used for energy storage during periods of peak loading.

Fabrication of high energy and power density supercapacitors in a wide temperature range is critical for their successful implementation in the automotive and consumer electronics markets. Performance of supercapacitors is dependent on their capacitance and voltage. Using high capacitance materials in conjunction with an asymmetric construct and ionic liquids electrolytes makes it possible to increase both capacitance and voltage. The use of ionic liquids contribute to a wide voltage window and stability at high temperatures .

An example of a good asymmetric capacitor consists of metal oxide xerogels and aerogels, intercalated with intrinsically conducting polymers as cathode nanocomposite materials, and an activated carbon anode in an ionic liquid electrolyte. The increased voltage due to the asymmetric construction and the wide voltage window of the ionic liquid electrolyte lead to high performance capacitors with energy densities in the battery range, and power densities comparable to some of the best capacitors. Self-Healable Supercapacitors.