In a major advancement for energy storage technology, Professor Yoon Seok Jung and his team at Yonsei University reveal a new fluoride-based solid electrolyte that enables all-solid-state batteries (ASSBs) to operate beyond 5 volts safely.

Their paper, published in Nature Energy, addressed a long-standing barrier in battery science, achieving high voltage stability without sacrificing ionic conductivity.

As Prof. Jung explains, “Our fluoride solid electrolyte, LiCl–4Li₂TiF₆, opens a previously forbidden route for high-voltage operation in solid-state batteries, marking a true paradigm shift in energy storage design.”