Breathing batteries could store 10 times the energy - tech - 19 May 2009 - New Scientist
UK researchers have developed a lithium-ion battery that uses air and porous carbon, rather than lithium cobalt oxide, as a anode. The resulting battery has a higher energy density than traditional lithium batteries, potentially a ten-fold increase. The carbon anode allows air to react with lithium ions, making it more like a fuel cell than a battery. More work is required before the battery can be commercialized.