Supercapacitors are electronic devices which are used to store extremely large amounts of electrical charge. They are also known as double-layer capacitors or ultracapacitors. Instead of using a conventional dielectric, supercapacitors use two mechanisms to store electrical energy: double-layer. The construction of supercapacitor is similar to the construction of electrolytic capacitors in that they consist of two foil electrodes, an electrolyte and a foil separator. The. Since supercapacitors bridge the gap between batteries and capacitors, they may be used in a wide variety of applications. One interesting application is the storage of energy in KERS, or dynamic braking systems (Kinetic Energy Recovery System) in.