Japan's 90 °C hydrogen battery breakthrough solves storage barrier

Researchers at the Institute of Science, Tokyo, have developed a groundbreaking hydrogen battery capable of operating at just 90 °C, significantly lower than the conventional 300–400 °C required for hydrogen storage. This innovation addresses a major challenge in hydrogen energy: safe and efficient storage. The team, including Dr. Takashi Hirose, Assistant Professor Naoki Matsui, and Professor Ryoji Kanno, created a solid-state battery using magnesium hydride (MgH₂) as the anode and hydrogen gas as the cathode, coupled with a novel solid electrolyte that facilitates rapid hydride ion movement at near room temperature. This design enables a fully reversible cycle of hydrogen absorption and release without the need for extreme heat, achieving the full theoretical storage capacity of MgH₂ (approximately 2,030 mAh g⁻¹ or 7.6 wt.% hydrogen). This breakthrough has significant implications for the hydrogen economy, potentially accelerating the adoption of hydrogen-powered vehicles, renewable energy storage, and