A supercapacitor, also known as an electrochemical capacitor, double-layer capacitor, gold capacitor, or Farad capacitor, is an electrochemical component developed in the 1970s and 1980s that stores energy through polarizing electrolytes.
It differs from traditional chemical power sources and is a power source with special properties between conventional capacitors and batteries. It mainly relies on double-layer and redox pseudocapacitance to store electrical energy. However, no chemical reaction occurs during the energy storage process, which is reversible. Because of this, supercapacitors can be charged and discharged hundreds of thousands of times.