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Li-ion conductivity in Li₂OHCl_1−xBr_x solid electrolytes: grains, grain boundaries and interfaces

Lookup NU author(s): Dr James DawsonORCiD

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Abstract

© 2022 The Royal Society of Chemistry. In this study, we conduct a comprehensive investigation of the effect of grain, grain boundary and interfacial resistance on the total Li-ion conductivity in Li2OHCl1−xBrx antiperovskite solid electrolytes. We highlight how the thermal expansion coefficient can serve as an indicator for the presence of structural defects, which are difficult to probe directly with X-ray techniques, and their effect on bulk Li-ion conduction. The detrimental effect of grain boundaries on ionic conductivity is investigated by atomistic calculations and validated experimentally by electrochemical impedance spectroscopy on pellets with controlled grain size. The effect of composition on interfacial resistance is probed by electrochemical impedance spectroscopy and X-ray photoelectron spectroscopy. These insights provide design principles to improve Li-ion conductivity in lithium hydroxide halide antiperovskites.

Publication metadata

Author(s): Lee HJ, Darminto B, Narayanan S, Diaz-Lopez M, Xiao AW, Chart Y, Lee JH, Dawson JA, Pasta M

Publication type: Article

Publication status: Published

Journal: Journal of Materials Chemistry A

Year: 2022

Volume: 10

Issue: 21

Pages: 11574-11586

Print publication date: 07/06/2022

Online publication date: 28/04/2022

Acceptance date: 26/04/2022

Date deposited: 05/07/2022

ISSN (print): 2050-7488

ISSN (electronic): 2050-7496

Publisher: Royal Society of Chemistry

URL: https://doi.org/10.1039/d2ta01462a

DOI: 10.1039/d2ta01462a

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