Fully charged chemistry

Add some tin and sulphur to the recipe for rechargeable lithium-ion batteries and you could deliver electrical power to mobile gadgets for far longer and avoid "aging" problems. The new formula being developed by Bruno Scrosati and Jusef Hassoun at the University of Rome, Italy, uses a carbon/lithium sulfide composite for the cathode, a lithium-ion-containing liquid enclosed in a gel-polymer membrane as the electrolyte, and a nanoscopic tin based anode. The new system has a specific energy of about 1100 Watt hours per kilogram, which surpasses all previous lithium-metal-free batteries.