Ultracapacitor
Ultracapacitors
are higher specific energy and power versions of electrolytic
capacitors — devices that store energy as an electrostatic
charge. They are electrochemical systems that store energy
in a polarized liquid layer at the interface between an ionically
conducting electrolyte and a conducting electrode. Energy
storage capacity increases by increasing the surface area
of the interface. Ultracapacitors are being developed as primary
energy devices for power assist during acceleration and hill
climbing, as well as recovery of braking energy. They are
also potentially useful as secondary energy storage devices
in hybrid electric vehicles, providing load-leveling power
to chemical batteries. Additional electronics are required
to maintain a constant voltage due to the low energy density.
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