Enhancement of the lithium ion conductivity of Ta-doped Li7La3Zr2O12 by incorporation of calcium

El-Shinawi, H., Cussen, E. J. and Corr, S. A. (2017) Enhancement of the lithium ion conductivity of Ta-doped Li7La3Zr2O12 by incorporation of calcium. Dalton Transactions, 29(46), pp. 9415-9419. (doi:10.1039/C7DT01573A)

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Abstract

Fast ion conducting garnet materials have been identified as promising electrolytes for all solid-state batteries. However, reliable synthetic routes to materials with fully elucidated cation site occupancies where an enhancement in lithium conductivity is observed remains a challenge. Ca-incorporation is developed here as a promising approach to enhance the ionic conductivity of garnet-type Li7-xLa3Zr2-xTaxO12 phases. Here we present a new sol-gel synthetic strategy as a facile route to the preparation of materials of a desired stoichiometry optimized for Li+ conductivity. We have found that the ionic conductivity of Li6.4La3Zr1.4Ta0.6O12 is increased by a factor of four by the addition of 0.2 mol of Ca per formula unit. Ca is incorporated in the garnet lattice where it has no effect on the sinterability of the material and is predominately located at the La sites. We anticipate that the ease of our synthetic route and the phases presented here represents a starting point for the further realization of solid state electrolyte compositions with similarly high Li+ conductivities using this methodology.

Item Type:Articles
Status:Published
Refereed:Yes
Glasgow Author(s) Enlighten ID:Corr, Professor Serena and El-Shinawi, Dr Hany
Authors: El-Shinawi, H., Cussen, E. J., and Corr, S. A.
College/School:College of Science and Engineering > School of Chemistry
Journal Name:Dalton Transactions
Publisher:Royal Society of Chemistry
ISSN:1477-9226
ISSN (Online):1477-9234
Published Online:03 July 2017
Copyright Holders:Copyright © 2017 The Royal Society of Chemistry
First Published:First published in Dalton Transactions 29(46):9415-9419
Publisher Policy:Reproduced under a Creative Commons License

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Project CodeAward NoProject NamePrincipal InvestigatorFunder's NameFunder RefLead Dept
693531High throughput microwave synthesis of Li-ion battery materialsSerena CorrEngineering and Physical Sciences Research Council (EPSRC)EP/N001982/1SCHOOL OF CHEMISTRY