Can supercapacitors be used as batteries?

Supercapacitors can be used as batteries.

Capacitor charging and discharging can certainly replace batteries. Without lead-acid batteries, there are only hundreds of cycles, and lithium batteries have thousands of life limits. However, there are two problems to be solved. One is that the capacity is large enough to ensure that enough electric energy is stored. Second, there must be high-power DC/DC, because the battery discharge terminal voltage drops and must be raised to the rated voltage of the electric vehicle. Capacitance is defined as the amount of electricity required to increase the unit voltage. The formula of plate capacitance is equal to the dielectric constant multiplied by a fraction, the numerator is the relative area of the plate, and the denominator is the distance between the plates. It can be seen from the formula that the method to increase the capacitance is to increase the relative area of the plates, reduce the distance between the plates and increase the dielectric constant. The large capacity of ordinary aluminum electrolysis is that electrolyte corrosion increases the relative area of plates, and the thin aluminum oxide insulation layer reduces the distance between plates and improves the dielectric constant.

Supercapacitor, also called electrochemical capacitor, [1] is a power type energy storage device. Its basic principle is to use the electric double layer structure composed of activated carbon porous electrode and electrolyte to obtain super-large capacity, which can be used to store electric energy. [1][4] supercapacitors can be divided into electric double-layer supercapacitors and pseudocapacitors (Faraday pseudocapacitors) according to different energy storage mechanisms. [5] Compared with ordinary capacitors, supercapacitors have hundreds of times higher energy storage capacity and discharge time under the same weight, while the power is only about110 of ordinary capacitors.