There is an increasing need for efficient, high-energy power sources for a variety of applications. Capacitors and batteries are the primary devices employed for electrical energy storage.
Conventional capacitors have high power densities but low energy storage densities.
Ultracapacitors fill a niche in between batteries and capacitors. Ultracapacitors bridge the gap between batteries and traditional capacitors in terms of energy density and power density. Pairing an ultracapacitor with a battery is an ideal method for reducing peak power requirements. Ultracapacitors attain high energy and power densities by storing charge in nanostructured, high surface area electrodes. These devices will complement and in some cases replace batteries and be the preferred energy storage device when weight, peak power, life and recharge cycle are key factors.