A novel solid-liquid route for synthesizing cubic garnet Al-substituted Li7La3Zr2O12

A novel solid-liquid route for synthesizing cubic garnet Al-substituted Li7La3Zr2O12 A solid-liquid composite method (SLM) of Al-substituted cubic lithium lanthanum zirconium garnet (c-LLZO) was developed. Cubic LLZO powders whose composition was Li6.23Al0.26La3Zr1.88O11.76 were prepared from the stoichiometric mixtures of lithium acetate, lanthanum oxide, zirconia and alumina, followed by an annealing of the dried precursor at 750°C for 12h in an air atmosphere. The resultant powders were characterized by XRD, SEM and ICP-OES. The conventional solid-state reaction methods using carbonates and hydroxides as lithium sources are also simply introduced as a comparison. In addition, the phase formation of c-LLZO powders synthesized by the ZrO2 powders with different specific surfaces as raw material was also investigated. The results show that the cubic garnet phase LLZO powders was obtained when the value of the specific surface area (SSA) of the material ZrO2 powder was about 110m2g−1. Sintering these cubic phase powders at 1150°C for 6h in air after uniaxial pressing obtained a dense ceramic pellet with a relative density of 91.2% and ionic conductivity of 2.54×10−4Scm−1 at 23°C. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Solid State Ionics Elsevier

A novel solid-liquid route for synthesizing cubic garnet Al-substituted Li7La3Zr2O12

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Publisher
Elsevier
Copyright
Copyright © 2017 Elsevier B.V.
ISSN
0167-2738
eISSN
1872-7689
D.O.I.
10.1016/j.ssi.2017.12.034
Publisher site
See Article on Publisher Site

Abstract

A solid-liquid composite method (SLM) of Al-substituted cubic lithium lanthanum zirconium garnet (c-LLZO) was developed. Cubic LLZO powders whose composition was Li6.23Al0.26La3Zr1.88O11.76 were prepared from the stoichiometric mixtures of lithium acetate, lanthanum oxide, zirconia and alumina, followed by an annealing of the dried precursor at 750°C for 12h in an air atmosphere. The resultant powders were characterized by XRD, SEM and ICP-OES. The conventional solid-state reaction methods using carbonates and hydroxides as lithium sources are also simply introduced as a comparison. In addition, the phase formation of c-LLZO powders synthesized by the ZrO2 powders with different specific surfaces as raw material was also investigated. The results show that the cubic garnet phase LLZO powders was obtained when the value of the specific surface area (SSA) of the material ZrO2 powder was about 110m2g−1. Sintering these cubic phase powders at 1150°C for 6h in air after uniaxial pressing obtained a dense ceramic pellet with a relative density of 91.2% and ionic conductivity of 2.54×10−4Scm−1 at 23°C.

Journal

Solid State IonicsElsevier

Published: Apr 1, 2018

References

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