Pyrochlore nanocrystals as versatile quasi-single-source precursors to lithium conducting garnets
| Autor: | Candace K. Chan, J. Mark Weller |
|---|---|
| Rok vydání: | 2020 |
| Předmět: |
Materials science
Renewable Energy Sustainability and the Environment Pyrochlore chemistry.chemical_element Sintering 02 engineering and technology General Chemistry engineering.material 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences 0104 chemical sciences chemistry Chemical engineering Nanocrystal visual_art engineering visual_art.visual_art_medium Fast ion conductor Ionic conductivity General Materials Science Lithium Ceramic Molten salt 0210 nano-technology |
| Zdroj: | Journal of Materials Chemistry A. 8:17405-17410 |
| ISSN: | 2050-7496 2050-7488 |
| DOI: | 10.1039/d0ta05842d |
| Popis: | 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. Via molten salt synthesis (MSS) in a highly basic flux, the pyrochlore nanocrystals transform to Li-garnet at reaction temperatures as low as 400 °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 °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. |
| Databáze: | OpenAIRE |
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