Investigations on increasing the operation voltage of hybrid supercapacitors used in pulsed power system

Super-capacitor is one of the best sources in pulsed power applications for their higher energy storage density. There are two ways to increase density of energy storage in capacitors, increasing ratio capacitance or element operation voltage. In order to increase density of energy storage by lifting its operation voltage, a hybrid super-capacitor with electrolytic anode and electro-chemistry super-capacitor cathode was constructed. At the first, a physical module of hybrid super-capacitor element is setup, and its energy storage mechanism is interpreted. Then, the electric field of the hybrid super-capacitor and porous electrodes is analyzed. According to the relationship of operation voltage and capacitance by the results, some methods are put forward to improve the distribution of electric field and operation voltage. Some experiments were made with sample elements of hybrid super-capacitor. The results show that the operation voltage of hybrid super-capacitor element can be over 200V, and density of energy storage can be over 2.5kJ/L, it can give higher density of energy storage in application of pulsed power systems.