Scientists have built the first rechargeable hydride ion battery. The researchers created a new type of core–shell hydride ion electrolyte and successfully assembled the first prototype of a rechargeable hydride ion battery. Researchers have developed the first room-temperature all-solid-state hydride ion battery. This structure leverages the high hydride ion conductivity of CeH 3 and the stability of BaH 2 , enabling fast hydride ion conduction at room temperature along with high thermal and electrochemical stability. The Prototype Hydride Ion BatteryFurthermore, researchers constructed a CeH 2 |3CeH 3 @BaH 2 |NaAlH 4 all-solid-state hydride ion prototype battery using NaAlH 4 , a classical hydrogen storage material, as the cathode active component.