Scientists and engineers at US-based technology research centre Argonne say they have developed a new battery which they say has four times the energy density of lithium-ion batteries. “The chemical reaction for lithium superoxide or peroxide only involves one or two electrons stored per oxygen molecule, whereas that for lithium oxide involves four electrons,” said Argonne chemist Rachid Amine. “With further development, we expect our new design for the lithium-air battery to also reach a record energy density of 1200 watt-hours per kilogram,” said Curtiss