Elucidating the nature of grain boundary resistance in lithium lanthanum titanate
Open Access
- 29 January 2021
- journal article
- research article
- Published by Royal Society of Chemistry (RSC) in Journal of Materials Chemistry A
- Vol. 9 (10), 6487-6498
- https://doi.org/10.1039/d0ta11539h
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.Funding Information
- Engineering and Physical Sciences Research Council (EP/R023603/1, EP/L000202, EP/P007821/1, EP/R010366/1, EP/R029431; EP/P020194/1)
- National Research Foundation Singapore (NRFF12-2020-0012;NRF2019-NRF-ANR073 Na-MASTER)
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