Advantages of Supercapacitor | disadvantages of Supercapacitor
This page covers advantages and disadvantages of Supercapacitor. It mentions Supercapacitor advantages or benefits and Supercapacitor disadvantages or drawbacks.
What is Supercapacitor?
Supercapacitor is a charge storage device which stores electrical charge via electrochemical and electrostatic processes. Due to their benefits as mentioned below, they have potential to replace or complement traditional batteries and capacitors in various applications. They are being used worldwide in various applications for automotive, consumer electronics, renewable energy, railways, defense, power industries etc. It is also known as ultracapacitor.
The figure-1 depicts supercapacitor manufactured by Samwha electric. Supercapacitors are classified into double layer capacitors, pseudocapacitors and hybrid capacitors based on their charge storage methods. Double-layer capacitors use electrostatic charge storage, Pseudocapacitors use electrochemical and hybrid capacitors use both of these methods.
The figure-2 depicts internal construction details of wound supercapacitor. The supercapacitor is made either in cylindrical shape or rectangular shape. The layers are stacked in an aluminium can (as shown) or adaptable rectangular housing.
Benefits or advantages of Supercapacitor
Following are the benefits or advantages of Supercapacitor:
➨It offers high energy density and high power density compare to common capacitor.
➨It offers high capacitance (From 1 mF to >10,000F) .
➨It offers fast charging ability.
➨It offers superior low temperature performance (from -40oC to 70oC).
➨It offers longer Service and long life (about 10 to 15 years compare to 5-10 years of Li-ion battery) . It offers virtually unlimited cycle life and can be cycled millions of time.
➨It offers higher reliability of performance.
➨It reduces size of the battery, its weight and consecutively cost.
➨Supercapacitors meet environmental standards. Hence they are eco-friendly.
Drawbacks or disadvantages of Supercapacitor
Following are the drawbacks or disadvantages of Supercapacitor:
➨They have higher self discharge rate. This is considerably high compare to battery.
➨Individual cells have low voltages. Hence series connections are required in order to achieve higher voltages.
➨Amount of energy stored per unit weight is considerably lower compare to electrochemical battery. This is about 3 to 5 W.h/Kg for an ultracapacitor than 30 to 40 W.h/Kg of a battery.
➨It offers low energy density compare to battery. This is about (1/5)th to (1/10)th the energy of the battery.
➨It can not be used in AC and higher frequency circuits.