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Journal Article

Pyrochlore nanocrystals as versatile quasi-single-source precursors to lithium conducting garnets


Chan,  Candace K.
Materials Science and Engineering, School for Engineering of Matter, Transport and Energy, Arizona State University, P.O. Box 876106, Tempe, AZ 85827, USA;
Research Group Tüysüz, Max-Planck-Institut für Kohlenforschung, Max Planck Society;

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Weller, J. M., & Chan, C. K. (2020). Pyrochlore nanocrystals as versatile quasi-single-source precursors to lithium conducting garnets. Journal of Materials Chemistry A, 8(34), 17405-17410. doi:10.1039/D0TA05842D.

Cite as: http://hdl.handle.net/21.11116/0000-0007-1989-3
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.