Abnormal Freezing Effect on Electron Conduction of Ball‐milled Lanthanum Trihydride for Superionic Conductor

作者：Weijin Zhang, Shangshang Wang, Shukun Liu, Jirong Cui, Hetong Chen, Ren Zou, Yuanhua Xia, Hujun Cao, Ping Chen · 发表于：Angewandte Chemie International Edition · 年份：2024 · DOI：10.1002/anie.202417610 · 被引用次数：5 · 研究领域：Hydrogen Storage and Materials、Ammonia Synthesis and Nitrogen Reduction、Carbon dioxide utilization in catalysis

Abstract A recent finding shows that lattice deformation could transform the mixed electronic/hydride (H − ) conducting lanthanum trihydride (LaH 3 ) to a superionic H − conductor. Such a feature would enable the development of a brand‐new all‐solid‐state hydride ion battery. It is essential to elucidate the mechanism of such a phenomenon. Here, we disclose an abnormal freezing effect on the electronic conductivity ( σ e ) of the ball‐milled LaH 3 ; that is, σ e can be lowered by over 2 orders of magnitude upon a low‐temperature treatment. Low‐temperature Raman reveals that at low temperatures, lattice deformation has a noticeable influence on the interaction of hydrogen at octahedral (H o ) and tetrahedral (H t ) sites, which may play a crucial role in hindering electron conduction. This freezing effect can significantly improve the ionic transfer number of rare earth‐based H − conductors and provide a new direction to the development of solid electrolytes for low‐temperature all‐solid‐state batteries.