Elucidating the nature of grain boundary resistance in lithium lanthanum titanate

Adam R. Symington, Marco Molinari, James A. Dawson, Joel M. Statham, John Purton, Pieremanuele Canepa, Stephen C. 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 the safety, stability and performance of rechargeable batteries. 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 Li-ion conductivity 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
Pages (from-to)6487-6498
Number of pages12
JournalJournal of Materials Chemistry A
Volume9
Issue number10
Early online date29 Jan 2021
DOIs
Publication statusPublished - 14 Mar 2021

ASJC Scopus subject areas

  • Chemistry(all)
  • Renewable Energy, Sustainability and the Environment
  • Materials Science(all)

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