Elucidating the Nature of Grain Boundary Resistance in Lithium Lanthanum Titanate

Adam Symington, Marco Molinari, James Dawson, Joel Statham, John A. Purton, Pieremanuele Canepa, Stephen Charles Parker

Research output: Contribution to journalArticlepeer-review

Abstract

Solid electrolytes for all-solid-state batteries are generating remarkable research interest as a means to improve, their safety, stability and performance. Solid electrolytes are often polycrystalline and the effect that grain boundaries have on the material properties is often not fully characterised. Here, we present a comprehensive molecular dynamics study that quantifies the effect of grain boundaries on Li-ion transport in perovskite Li3xLa(2/3)-xTiO3 (0 < x < 0.16) (LLTO). Our results predict that grain boundaries hinder Li-ion conductivity by 1 to 2 orders of magnitude compared to the bulk. We attribute the poor con-ductivity of the grain boundaries to significant structural alterations at the grain boundaries. Our detailed analysis provides important insight into the influence of grain boundary structure on transport of Li-ions in solid electrolyte materials.
Original languageEnglish
JournalJournal of Materials Chemistry A
Early online date29 Jan 2021
DOIs
Publication statusE-pub ahead of print - 29 Jan 2021

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