Paper-thin, biodegradable batteries may be coming to an electronics store near you. The biodegradable batteries, which would compete with commercial lithium-ion batteries, are made of algae.

Researchers at Uppsala University in Sweden have found that the algae species that clump together on beaches (called Cladaphora) can be used to make cellulose that is strong enough to hold conducting polymers that can recharge and hold electricity. In addition to being eco-friendly, researchers believe that the biodegradable batteries can be used for flexible electronics in the future, such as clothing that lights up.