Effect of Excess Li on the Structural and Electrical Properties of Garnet-Type Li6La3Ta1.5Y0.5O12

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dc.contributor.authorNarayanan, Sumaletha
dc.contributor.authorHitz, Gregory T.
dc.contributor.authorWachsman, Eric D.
dc.contributor.authorThangadurai, Venkataraman
dc.date.accessioned2016-09-09T15:55:30Z
dc.date.available2016-09-09T15:55:30Z
dc.date.issued2015
dc.description.abstractVolatility of lithium during preparation of lithium-stuffed garnet-type metal oxide solid Li ion electrolytes is a common problem, which affects phase formation, ionic conductivity, mechanical strength and density. Synthesis of Li-stuffed garnets has been performed generally using the conventional solid-state reactions at elevated temperature in air. The present study describes the effect of excess LiNO3 (2.5 to 15 wt.%) addition during the ceramic synthesis on the structural and electrical properties of garnet-type Li6La3Ta1.5Y0.5O12. Powder X-ray diffraction (PXRD) confirmed that cubic phase was formed in all tested cases, and there is no significant variation in lattice parameter with amount of excess LiNO3 used. However, increasing amounts of excess lithium decreased inter-particle contact and increased grain growth during sintering, producing sharply varied microstructures. PXRD showed no secondary phase and scanning electron microscopy (SEM) analysis showed rather uniform morphology and absence of "glassy" materials at the grain-boundaries. The bulk Li ion conductivity was found to increase with amount of excess lithium, reaching a maximum room temperature conductivity of 1.62 × 10−4 Scm−1 for the sample prepared using 10 wt.% excess LiNO3. Raman microscopy study indicated the presence of Li2CO3 in all aged Li6La3Ta1.5Y0.5O12 samples prepared using excess LiNO3.
dc.description.refereedYesen_US
dc.identifier.citationNarayanan, S., Hitz, G. T., Wachsman, E. D., & Thangadurai, V. (2015). Effect of Excess Li on the Structural and Electrical Properties of Garnet-Type Li6La3Ta1.5Y0.5O12. Journal of The Electrochemical Society, 162(9), A1772–A1777. https://doi.org/10.1149/2.0321509jes
dc.identifier.doihttp://dx.doi.org/10.11575/PRISM/35421
dc.identifier.issn0013-4651
dc.identifier.urihttp://hdl.handle.net/1880/51579
dc.language.isoenen_US
dc.publisherElectrochemical Societyen_US
dc.publisher.departmentDepartment of Chemistryen_US
dc.publisher.institutionUniversity of Calgaryen_US
dc.publisher.urlhttp://www.electrochem.org/en_US
dc.rights© The Author(s) 2015. Published by ECS
dc.rights.urihttp://creativecommons.org/licenses/by-nc-nd/4.0/
dc.titleEffect of Excess Li on the Structural and Electrical Properties of Garnet-Type Li6La3Ta1.5Y0.5O12en_US
dc.typejournal article
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