Supercapacitors are capacitors that utilize the double layer principle. When the applied voltage is applied to the two plates of the supercapacitor

　　When on, like ordinary capacitors, the positive electrode of the electrode plate stores positive charges, while the negative electrode plate stores negative charges

　　Under the action of the electric field generated by the charges on the bipolar plates of a capacitor, a phase is formed at the interface between the electrolyte and the electrode

　　The reverse charge is used to balance the internal electric field of the electrolyte, and this positive and negative charge are connected between two different phases

　　On the contact surface, there is an extremely short gap between positive and negative charges arranged in opposite positions, and this charge distribution layer is called a double layer

　　The electrical layer, therefore, has a very large capacitance. When the potential between the two plates is lower than the oxidation-reduction electrode potential of the electrolyte,

　　The charge on the electrolyte interface will not detach from the electrolyte, and the supercapacitor is in normal working condition (usually 3V)

　　If the voltage at both ends of the capacitor exceeds the oxidation-reduction electrode potential of the electrolyte, the electrolyte will decompose

　　Abnormal state. Due to the discharge of the supercapacitor, the charges on the positive and negative plates are discharged by the external circuit, and the charges on the interface of the electrolyte are correspondingly reduced. From this, it can be seen that the charging and discharging process of supercapacitors is always a physical process without any chemical reactions. Therefore, the performance is stable and different from batteries that utilize chemical reactions.

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