Lithium-air batteries do carry a theoretical energy density that is 10 times that of Li-ion, and are being looked at as the natural successor, although experimental models to date have not been stable enough for everyday use, and have their fair share of issues like poor charge or discharge rates and low energy efficiency. Not only that, they can only be operated in pure oxygen environments, which is impractical in everyday atmosphere.
Researchers at Cambridge University have added some sense of stability and efficiency with the inclusion of lithium iodide and a fluffy carbon electrode that is made of sheets of graphene. This lithium-air battery developed by Tao Liu, Clare P. Grey and colleagues at Cambridge, is the first step to a brighter future where batteries are concerned, but realistically speaking, anything practical for the masses will only arrive in 10 years’ time at the best estimates.