Mechanistic Origin of Superionic Lithium Diffusion in Anion-Disordered Li₆PS₅ X Argyrodites.

ABSTRACT: The rational development of fast-ion-conducting solid electrolytes for all-solid-state lithium-ion batteries requires understanding the key structural and chemical principles that give some materials their exceptional ionic conductivities. For the lithium argyrodites Li₆PS₅X (X = Cl, Br, or I), the choice of the halide, X, strongly affects the ionic conductivity, giving room-temperature ionic conductivities for X = {Cl,Br} that are ×10³ higher than for X = I. This variation has been attributed to differing degrees of S/X anion disorder. For X = {Cl,Br}, the S/X anions are substitutionally disordered, while for X = I, the anion substructure is fully ordered. To better understand the role of substitutional anion disorder in enabling fast lithium-ion transport

SUBMITTER: Morgan BJ 

PROVIDER: S-EPMC8029578 | biostudies-literature | 2021 Mar

REPOSITORIES: biostudies-literature