1. Prepared by T Vigneshkumar S Vijayakumar
SUPERCAPACITOR
Prepared by T Vigneshkumar S Vijayakumar

2. Supercapacitor Supercapacitor is a high-capacity
electrochemical capacitor
Capacitance value 10,000 farads
It is the bridge of the electrolytic capacitor
and rechargeable batteries

3. Introduction
Electric Double Layer Capacitor(EDLC) also known as ultra capacitor or super capacitor
It is made up of two conductors which is separated by dielectric
A dielectric can be made up of paper, mica, ceramic or a vacuum

4. Principle
Energy is stored in a capacitor by polarising the electrolytic solution
The charges are separated by electrode- electrolyte interface

6. Types of supercapacitors

7. Construction
It consists of porous electrode, electrolyte and current collector
There is a membrane which separates positive and negative plate is called separator

8. Working There are two carbon sheets separated by a separator
It stores more energy than other electrolytic capacitor
When voltage is applied to a positive terminal it attracts negative ions from the separator
When voltage is applied to a negative terminal it attracts positive ion from the separator

9. The ions are stored near the surface of carbon
The distance between the plates in order of angstroms
Ultra capacitor stores energy via electrostatic charges on opposite surfaces of the electric double layer.
The purpose of having separator is to prevent the charges moving across the electrodes.

10. Dielectric constant of medium X area of the plate
Capacitance =
Distance between the plates
The amount of energy stored is very large as compared to a standard capacitor because of the enormous surface area created by the porous carbon electrodes and the small charge separation (10 angstroms) created by the dielectric separator

11. Rechargeable Battery vs Supercapacitor
Supercapacitors
Batteries
Higher power density
Much faster charge and discharge rate
Environmentally friendly
Extremely low internal resistance or ESR
High efficiency(97-98%)
Over a million charge-discharge cycle
Have higher energy density
Typically charge- discharge cycle
Containing highly reactive and hazardous chemicals
Negatively effected by low temperature

12. Advantages
Long Life: It works for large number of cycle without wear and aging
Rapid charging: It takes a second to charge completely
Low cost: It is less expensive as compared to electrochemical battery
High power storage: It stores huge amount of energy in a small volume
Faster release: Release the energy much faster than battery

13. Disadvantages They have low energy density
Individual cell shows low energy density
Not all the energy can be utilized during discharge
They have high self discharge as compared to battery
Voltage balance is required when more than three capacitor connected in series

14. Applications
They are used in electronic applications such as cellular electronics, power conditioning, Uninterruptible Power Supplies(UPS)
They used in industrial lasers, medical equipment

15. Electric vehicles
They are used electric vehicles for load levelling to extend the life of batteries
It stores some energy from already moving vehicle
So we don’t want to give external energy

16. Wireless systems
They are used in wireless communication system for uninterrupted service
They are used in VCRs CD players, electronic toys, security system and computers

17. Thank you