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

Hany El-Shinawi, Edmund J. Cussen, Serena A. Corr

Research output: Contribution to journalArticle

10 Citations (Scopus)

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.
LanguageEnglish
Pages9415-9419
Number of pages5
JournalDalton Transactions
Volume46
Issue number29
Early online date3 Jul 2017
DOIs
Publication statusPublished - 7 Aug 2017

Fingerprint

Lithium
Garnets
Ions
Calcium
Ionic conductivity
Electrolytes
Stoichiometry
Sol-gels
Cations
Chemical analysis

Keywords

  • fast ion conducting
  • electrolytes

Cite this

El-Shinawi, Hany ; Cussen, Edmund J. ; Corr, Serena A. / Enhancement of the lithium ion conductivity of Ta-doped Li7La3Zr2O12 by incorporation of calcium. In: Dalton Transactions. 2017 ; Vol. 46, No. 29. pp. 9415-9419.
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Enhancement of the lithium ion conductivity of Ta-doped Li7La3Zr2O12 by incorporation of calcium. / El-Shinawi, Hany; Cussen, Edmund J.; Corr, Serena A.

In: Dalton Transactions, Vol. 46, No. 29, 07.08.2017, p. 9415-9419.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Enhancement of the lithium ion conductivity of Ta-doped Li7La3Zr2O12 by incorporation of calcium

AU - El-Shinawi, Hany

AU - Cussen, Edmund J.

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N2 - 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.

AB - 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.

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