Abstract

An electrochemical capacitor or electric double-layer capacitor (EDLC), also known as supercapacitor, pseudocapacitor, electrochemical double layer capacitor, or ultracapacitor is an energy storage device with high power and relatively high energy density. Compared to conventional electrolytic capacitors the energy density is typically 3 orders of magnitude greater. In comparison with conventional batteries or fuel cells, EDLCs show lower energy density but have a much higher power density. EDLCs have a variety of commercial applications, notably in energy-smoothing and momentary-load devices. They have applications as energy-storage devices used in vehicles, and applications like wind power solar energy systems where extremely fast charging required.

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