Double-layer capacitance
The amount of charge stored in double-layer capacitor depends on the applied voltage. The double-layer capacitance is the physical principle behind the electrostatic double-layer type of
Electric double layer capacitors, namely super-capacitors, are used mainly to assist other power supplies in coping with surge power requirements particularly in electric/hybrid vehicles. The Shanghai municipality tested electric buses powered by supercapacitors (capabuses).
The amount of charge stored in double-layer capacitor depends on the applied voltage. The double-layer capacitance is the physical principle behind the electrostatic double-layer type of supercapacitors.
Therefore, the total capacitance value of a double-layer capacitor is the result of two capacitors connected in series. If both electrodes have approximately the same capacitance value, as in symmetrical supercapacitors, the total value is roughly half that of one electrode.
Unlike a normal capacitor, a double-layer capacitor has a large electric capacity because the electric double-layer, that is a layer with the opposite polarity to the electrode is formed around the electrode of the electrolyte. As with normal capacitors, it has very good high-current charge/discharge and repetitive cycle characteristics.
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