30 October 2015
Vol 350, Issue 6260

About The Cover

Cover image expansion

COVER False-color microscopic view of a reduced graphene oxide electrode (black, center), which hosts the large (on the order of 20 micrometers) lithium hydroxide particles (pink) that form when a lithium-oxygen battery discharges. Lithium iodide aids in the removal of the particles upon charging, resulting in an efficient and highly energy-dense battery with potential applications in portable electronics, transportation, and grid storage. See page 530.
Illustration: Valerie Altounian/Science