Our research group developed the first gas-solid hydride ion battery that enables efficient hydrogen storage under ambient temperature and pressure, eliminating the need for extreme condition such as high pressure (700 atm) or cryogenic temperatures (-253°C). This battery utilises hydrogen gas as the positive electrode and magnesium metal as the negative electrode. During discharge, hydrogen is converted into hydride ions (H^-), while magnesium is converted into magnesium hydride (MgH₂); the reverse reactions occur during charging, alloing simultaneous hydrogen and electricity storage.

Key results include:

1) An initial discharge capacity of 1526 mAh g^-1, release of ~6.0 wt% hydrogen at 0.3 V and room temperature,

2) >70% capacity retention after 60 cycles, stable operation from −20 to 90°C, and

3) Stacking of the cells powering an LED light.

The system achieves an overall energy efficiency of 93.9%; about one-third higher than conventional thermal hydrogen storage (e.g., Mg/MgH₂ systems requiring ~300°C for dehydrogenation). This breakthrough offers a safe, efficient method for hydrogen storage applications.

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