Abstract
A recent finding shows that lattice deformation could transform the mixed electronic/hydride (H-) conducting lanthanum trihydride (LaH3) 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 (σe) of the ball-milled LaH3; that is, σe 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 (Ho) and tetrahedral (Ht) 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.
Published Version
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