Source: The Economist
Modified viruses help researchers boost battery performance
BUILDING a better battery has become an intense area of research. A device that could store more power in the same amount of weight as widely used lithium-ion cells could, for instance, allow smartphones to run for weeks on a single charge or an electric car to be driven non-stop for hundreds of kilometres. Among the alternatives being explored, lithium-air batteries are a favourite. But they can be tricky to make and unreliable. Now researchers have found a way to overcome some of those shortcomings with the help of genetically modified viruses.
Using viruses to make batteries is not new:
Angela Belcher and her colleagues at the Massachusetts Institute of Technology (MIT) demonstrated in 2009 that it was possible by getting modified viruses to coat themselves with the necessary materials required for the anode and cathode in a small button-sized lithium-ion cell.
Lithium-air batteries oxidise lithium at the anode and reduce oxygen at the cathode to induce a current flow. Because the oxygen comes from the air there is no need for some of the relatively heavy internal materials used in other types of battery. That promises a greatly increased energy density (the amount of power that can be stored in a given weight of battery). Read the rest of this entry »