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The concept and characteristics of electrochemical supercapacitors

by:SMiLer     2021-02-09
Believe everyone not strange for capacitor, this is the most basic electronic components, it not only sort is various, and applied widely. Below small make up, and everyone together to see what is what is the distinguishing feature of electrochemical supercapacitors electrochemical capacitor? What is electrochemical capacitor refers to a kind of electrochemical capacitors based on the high specific surface area of carbon material, metal oxides and conductive polymer electrode materials such as a new type of energy storage component. The significant characteristic of electrochemical capacitor is can get large electric capacity and excellent transient charge and discharge performance. In recent years, with the deepening understanding of the electrochemical capacitor, national and enterprise investment increasing research on electrochemical capacitors, a growing number of research institutes and universities into the ranks of the electrochemical capacitor research and research level also had great progress, but from the point of whole level, our country is still in the field of electrochemical capacitor research significantly lags behind the advanced level. What is the distinguishing feature of electrochemical supercapacitors ( 1) High energy density. Electrochemical supercapacitors than traditional 10 to 100 times greater than the energy density of capacitor to reach 1 ~ 10 w. h/kg. ( 2) High power density. Power density can reach 2 kW/kg, for more than 10 times of the battery, can in a short time sent out several hundred to several thousand amperes of current, high power output is very suitable for use in a short time. ( 3) Long service life. Charge and discharge occurred in the process of electrochemical reaction has good reversibility, its theory circle life is infinite, can actually reach more than 100000 times, 10 to 100 times higher than the battery. ( 4) Using a wide temperature range. Can in - 40 ~ + 70 ℃ temperature range of use, and general battery for the - 20~+60℃。 Charge and discharge process of charge transfer on the surface of electrode active material, mostly all capacity with temperature attenuation is very small. At low temperature and battery capacity attenuation rate is as high as 70%. Electrochemical supercapacitor is a new type of energy storage component, it has the characteristic such as high energy density, use temperature scope width, the most important thing is that the service life of the capacitor is very long.
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