Wooden it be nice?

A sliver of wood coated with tin could make a truly green battery, according to Liangbing Hu, Teng Li and colleagues writing in the journal Nano Letters. The team has exploited the absorbancy of wood fibers as a flexible support for holding mineral-rich water, as an electrolyte in an experimental sodium-ion battery. Replacing lithium with sodium offers a way to build more environmentally benign rechargeable batteries, the authors suggest.