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

El-Shinawi, Hany and Cussen, Edmund J. and Corr, Serena A. (2017) Enhancement of the lithium ion conductivity of Ta-doped Li7La3Zr2O12 by incorporation of calcium. Dalton Transactions, 46 (29). pp. 9415-9419. ISSN 1477-9226 (https://doi.org/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.

ORCID iDs

El-Shinawi, Hany, Cussen, Edmund J. ORCID logoORCID: https://orcid.org/0000-0002-2899-6888 and Corr, Serena A.;
  • Item type:Article
    ID code:61646
    Dates:
    Date
    Event
    7 August 2017
    Published
    3 July 2017
    Published Online
    25 June 2017
    Accepted
    Subjects:Science > Chemistry
    Department:Faculty of Science > Pure and Applied Chemistry
    Depositing user: Pure Administrator
    Date deposited:28 Aug 2017 11:49
    Last modified:11 Nov 2024 11:46
    URI:https://strathprints.strath.ac.uk/id/eprint/61646
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