Core Viewpoint - The article discusses the development of a novel room temperature rechargeable all-solid-state hydride ion battery, highlighting the significance of hydride ions (H⁻) in advancing electrochemical devices and addressing the challenges in electrolyte materials for such batteries [2][10]. Group 1: Research Development - The research team from the Dalian Institute of Chemical Physics, Chinese Academy of Sciences, published a paper in Nature detailing the creation of a new core-shell structure hydride ion electrolyte, leading to the first prototype of a hydride ion battery [3]. - In April 2023, the same team proposed a strategy to suppress electronic conductivity through lattice distortion, resulting in a low-temperature superfast hydride ion conductor based on rare earth hydrides [6]. Group 2: Battery Performance - The newly developed composite hydride, 3CeH₃@BaH₂, exhibits rapid hydride ion conduction at room temperature and becomes a superionic conductor above 60°C, making it an ideal electrolyte material [7]. - The prototype battery, constructed with NaAlH₄ and CeH₂ as active materials, achieved a discharge capacity of 984 mAh/g at room temperature, maintaining a reversible capacity of 402 mAh/g after 20 charge-discharge cycles [7]. - The team successfully increased the working voltage to 1.9 V in a stacked battery configuration, demonstrating the battery's capability to power electronic devices, such as lighting a yellow LED [7]. Group 3: Implications for Clean Energy - This all-solid-state hydride ion secondary battery utilizes hydrogen as a charge carrier, effectively avoiding harmful metallic dendrite formation and the associated short-circuit risks, thus paving new avenues for clean energy storage and conversion [10].