A team from the Tokyo University of Science is working on a new electrolyte material made from pyrochlore-type oxyfluoride that could outperform other types of electrolytes used in solid-state batteries and help the technology compete against lithium-ion alternatives. "We have discovered an oxide solid electrolyte that is a key component of all-solid-state lithium-ion batteries, which have both high energy density and safety," said professor Kenjiro Fujimoto.