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Halogenation of Li7La3Zr2O12 solid electrolytes: a combined solid-state NMR, computational and electrochemical study

Dong, Bo; Haworth, Abby R.; Yeandel, Stephen R.; Stockham, Mark P.; James, Matthew S.; Xiu, Jingwei; Wang, Dawei; Goddard, Pooja; Johnston, Karen E.; Slater, Peter R.

Halogenation of Li7La3Zr2O12 solid electrolytes: a combined solid-state NMR, computational and electrochemical study Thumbnail


Authors

Bo Dong

Abby R. Haworth

Stephen R. Yeandel

Mark P. Stockham

Matthew S. James

Jingwei Xiu

Dawei Wang

Pooja Goddard

Peter R. Slater



Abstract

Garnet-based solid electrolytes have been proposed as promising candidates for next generation all-solid-state batteries. Whilst multiple cation substitution studies of these garnets have been undertaken to try and improve their overall performance, anion doping of garnets has rarely been attempted, owing to the synthetic challenges associated with this particular doping strategy. In this work, we present the halogenation (F, Cl) of the solid state electrolyte Li7La3Zr2O12 (LLZO) via a low temperature solid state synthetic route using PTFE and PVC polymers. A reduction in tetragonal distortion (F incorporation) and a tetragonal to cubic phase transition (Cl incorporation) is observed in halogenated LLZO, suggesting the replacement of O2− with F− or Cl− is associated with the creation of lithium vacancies. Combined solid-state NMR and computational studies support the presence of F− or Cl− in halogenated LLZO. The effects of surface fluorination were also investigated for Al-doped LLZO (Li6.4Al0.2La3Zr2O12, LLAZO) with the results suggesting that this strategy has the ability to prevent full dendrite penetration at high current densities (up to 10 mA cm−2).

Citation

Dong, B., Haworth, A. R., Yeandel, S. R., Stockham, M. P., James, M. S., Xiu, J., …Slater, P. R. (2022). Halogenation of Li7La3Zr2O12 solid electrolytes: a combined solid-state NMR, computational and electrochemical study. Journal of Materials Chemistry A: materials for energy and sustainability, 10(20), https://doi.org/10.1039/d1ta07309e

Journal Article Type Article
Acceptance Date Feb 21, 2022
Online Publication Date May 4, 2022
Publication Date 2022
Deposit Date Jul 5, 2022
Publicly Available Date Jul 5, 2022
Journal Journal of Materials Chemistry A
Print ISSN 2050-7488
Electronic ISSN 2050-7496
Publisher Royal Society of Chemistry
Peer Reviewed Peer Reviewed
Volume 10
Issue 20
DOI https://doi.org/10.1039/d1ta07309e

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