Hydride ion (H⁻), with their low mass and high redox potential, are considered promising charge carriers for next-generation electrochemical devices. However, the lack of efficient electrolyte with fast hydride ion conductivity, thermal stability, and electrode compatibility has hindered their practical applications. Schematic diagram of the first hydride ion prototype battery DICPIn a study published in Nature, Prof. CHEN Ping’s group from the Dalian Institute of Chemical Physics (DICP) of the Chinese Academy of Sciences (CAS) developed a novel core–shell hydride ion electrolyte, and constructed the first rechargeable hydride ion prototype 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. Furthermore, researchers constructed a CeH 2 |3CeH 3 @BaH 2 |NaAlH 4 all-solid-state hydride ion prototype battery battery using NaAlH 4 , a classical hydrogen storage material, as the cathode active component.