Journal
JOURNAL OF MATERIALS CHEMISTRY A
Volume 8, Issue 34, Pages 17405-17410Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/d0ta05842d
Keywords
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Funding
- NSF CAREER award [DMR 1553519]
- ASU Fulton Schools of Engineering Dean's Fellowship
- Max Planck Society
- Alexander von Humboldt Foundation
- [NNCI-ECCS-1542160]
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Lithium conducting garnets are attractive solid electrolytes for solid-state lithium batteries but are difficult to process, generally requiring high reaction and sintering temperatures with long durations. In this work, we demonstrate a synthetic route to obtain Ta-doped garnet (Li6.4La3Zr1.4Ta0.6O12) utilizing La- and Ta-doped lanthanum zirconate (La2.4Zr1.12Ta0.48O7.04) pyrochlore nanocrystals as quasi-single-source precursors.Viamolten salt synthesis (MSS) in a highly basic flux, the pyrochlore nanocrystals transform to Li-garnet at reaction temperatures as low as 400 degrees C. We also show that the pyrochlore-to-garnet conversion can take place in one step using reactive sintering, resulting in densified garnet ceramics with high ionic conductivity (0.53 mS cm(-1)at 21 degrees C) and relative density (up to 94.7%). This approach opens new avenues for lower temperature synthesis of lithium garnets using a quasi-single-source precursor and provides an alternative route to highly dense garnet solid electrolytes without requiring advanced sintering processes.
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