Unlike traditional capacitors, which use dielectric material to store energy, supercapacitors store energy through the electrochemical double-layer effect and, in some cases, through a reversible faradaic redox reaction.
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Supercapacitors offer fast charge-discharge rates, long cycle life, and wide temperature range, but have lower energy density, higher self-discharge, and cost compared to batteries.
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Electric double layer capacitors and supercapacitors are a class of electrolytic (polarized) capacitors that offer exceptionally high capacitance values in relation to their physical size and low voltage ratings; individual devices have ratings of a few volts at most, though products.
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