Supercapacitor Technical Guide
Supercapacitors, also known as ultracapacitors and electric double layer capacitors (EDLC), are capacitors with capacitance values greater than any other capacitor type available today.
The operating voltage range of a standard capacitor is very high, but for supercapacitors, it is between 2.5 and 2.7 V. The electrochemical supercapacitors are classified into three categories based on the charge storage mechanism: (1) electrochemical double-layer capacitors (EDLCs), (2) pseudocapacitors, and (3) hybrid capacitors.
The capacitance value of a supercapacitor is determined by two storage principles: Double-layer capacitance – electrostatic storage of the electrical energy achieved by separation of charge in a Helmholtz double layer at the interface between the surface of a conductor electrode and an electrolytic solution electrolyte.
Supercapacitors comprise current collectors (conducting metal plates), electrodes, an electrolyte, and a separator. The structures of supercapacitors vary from standard capacitors to batteries. The utilization of activated carbon increases the surface area, thereby increasing the capacitance value.
Supercapacitors do not support alternating current (AC) applications. In applications with fluctuating loads, such as laptop computers, PDAs, GPS, portable media players, hand-held devices, and photovoltaic systems, supercapacitors can stabilize the power supply.
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