Electroactive polymer-based electrochemical capacitors using poly(benzimidazo-benzophenanthroline) and its pyridine derivative poly(4-aza-benzimidazo-benzophenanthroline) as cathode materials with ionic liquid electrolyte

▸ A new processing technique gives polymer films with superior transport properties. ▸ Using this technique, Type IV capacitors were constructed. ▸ BBL-based capacitors store slightly more energy than a comparable Py-BBL device at low rates. ▸ The Py-BBL devices deliver much higher energy at higher rates. ▸ The Py-BBL devices were found to last least five times as long as the BBL devices.