The OPUSAT CubeSat, slated for launch in the Japanese Financial Year 2013, is planning to use a Lithium-Ion Capacitor. I think this will be the first time such a device has been flown in space. If successful the greater power density offered could be useful for future CubeSat missions.
OPUSAT CubeSat http://amsat-uk.org/2013/04/30/opusat-cubesat/
Flying Laptop – 130 kg Satellite http://amsat-uk.org/2013/04/30/flying-laptop-130-kg-satellite/
73 Trevor M5AKA AMSAT-UK website http://amsat-uk.org/ Facebook https://www.facebook.com/pages/AMSAT-UK/208113275898396 Twitter https://twitter.com/AMSAT_UK ----