Super capacitors can be divided into electric double-layer capacitors and pseudo capacitor according to energy storage mechanism. It is a new type of energy storing device, with features such as high-power density, short charging time, long lifetime, good temperature characteristic, energy saving, environmental protection, etc. Super capacitor is widely used.
Super capacitor is also called electric double-layer capacitor. As a new type of energy storing device, it has features such as short charging time, long lifetime, good temperature characteristics, energy saving, environmental protection, etc.
It is stated that super capacitor has two kinds: electric double-layer capacitor and electrochemical capacitor.
Electric double-layer capacitor is a new type of component which stores energy by interface double layers formed between electrode and electrolyte. When the electrode contacts electrolyte, because of the functions of Coulombic force, intermolecular force and interatomic force, a stable double-layer electric charge with opposite sign appears on solid liquid interface, which is called interface double layers.
Electric double-layer capacitor' electrode materials are porous carbon materials, including activated carbon (activated carbon powder and fiber), carbon aerogel and carbon nano tube. The size of electric double-layer capacitor is related to porosity of electrode materials. Usually, the higher the porosity is, the bigger the specific surface area of electrode materials, and the bigger the double-layer capacitance. However, it is not that the higher the porosity is, the bigger the capacity of super capacitor. Keep pore size of electrode materials from 2 to 50nm and enhance porosity, so effective specific surface area of materials will be improved, and then capacitance will be enhanced.
In new energy vehicle area, super capacitor can be used along with secondary battery, and realize energy storage and protect battery.
Usually, super capacitor is used along with lithium-ion battery. The perfect match forms PHEVs power supply with stable performance and environmental protection, which can be used in hybrid electric vehicle and pure electric vehicle.
Lithium-ion battery solves the problem of automobile charging and energy storage as well as providing lasting power. The mission of super capacitor is offering high-power auxiliary power for automobile starting and acceleration, as well as collect and store energy for automobile brake or idle running.
Super capacitor can rapidly recycle and store energy during deceleration, downhill and brake, turn spare irregular power produced during automobile running into charging energy of battery, and protect safe and stable operation of battery; when starting or accelerating, battery will transfer energy into super capacitor, which will provide necessary peak energy within short time.
Many Chinese manufacturers, who set foot in new energy vehicle, have chosen technical root which combines super capacitor with lithium-ion battery.
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