Super capacitor is a kind of capacitor with higher capacity than traditional capacitor. Energy is stored by polarizing the electrolyte. It is an energy storage device between capacitor and battery. It has the characteristics of rapid charging and discharging of capacitor and energy storage of battery. Super capacitors have the advantages of long charging and discharging life, rapid charging, large capacitance, wide operating temperature range, arbitrary parallel connection to increase capacitance, maintenance free and environmental protection.

Supercapacitors are divided into electric double layer capacitors, Faraday pseudocapacitors and hybrid supercapacitors. Faraday pseudocapacitor, also known as Faraday quasi capacitor, is a kind of capacitance related to electrode charging potential, which is generated by highly reversible chemisorption or redox reaction of electrode active substances through under potential deposition in the two-dimensional or three-dimensional space of the living phase on the electrode surface. When the supercapacitor scheme is charged, the ions in the electrolyte will diffuse to the electrode/solution interface under the effect of the external electric field, and then enter into the bulk phase of the active oxide on the electrode surface through the electrochemical reaction of the interface; If the electrode material is an oxide with a large specific surface area, a considerable number of electrochemical reactions will occur, and a large number of charges will be stored in the electrode.

Super capacitor module During discharge, these ions entering the nitride will return to the electrolyte, and the stored charge will be released through the external circuit. The advantage of Faraday pseudocapacitor is that when the electrode area is the same, the specific capacitance of Faraday pseudocapacitor is 10-100 times of that of electric double layer capacitor, and it also has a large specific capacitance and energy density. Hybrid supercapacitor is a kind of supercapacitor that uses traditional battery electrode at one end to store and convert energy through electrochemical reaction, and uses double electric layers at the other end to store energy.