(Phys.org)—Scientists have used sugar cubes as a template for synthesizing stretchable battery electrodes, which serve as a key component in newly designed stretchable yet mechanically robust sodium-ion batteries. Although there has recently been a great deal of research on stretchable batteries, usually these devices still contain some rigid components. By using electrodes templated on sugar cubes, the new battery is one of the first sodium-ion batteries whose components are all fully stretchable.