Supercapacitors are electrochemical components developed from the 1970s and 1980s that use polarized electrolytes to store energy. It is different from the traditional chemical power supply. It is a power supply with special performance between traditional capacitors and batteries. It mainly relies on an electric double layer and redox pseudocapacitor charge to store electric energy.
In 1879, Helmholz discovered the properties of double-layer capacitors and proposed the concept of electric double layers, but the use of electric double layers for energy storage is only a matter of recent decades. In 1957, Bcker first proposed that a smaller capacitor can be used as an energy storage device, which has specific energy close to that of a battery. In 1968, Standard Oil Corporation Sohio first proposed a patent for making double-layer capacitors using high-specific surface area carbon materials and transferred the patented technology to NEC. NEC began to produce supercapacitors for the start-up system of electric vehicles in 1979.
As a product, supercapacitors have become mature, and their application scope has been continuously expanded. They have been widely used in industries, consumer electronics, communications, medical equipment, national defense, military equipment, and transportation. From small-capacity special energy storage to large-scale electric energy storage, from separate energy storage to hybrid energy storage combined with batteries or fuel cells, supercapacitors have demonstrated unique advantages. The United States, Europe, Japan, South Korea, and other developed countries and regions have conducted fruitful research on the application of supercapacitors.
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