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

DOI: 10.1039/D0TA05842D DOI Help

Authors: J. Mark Weller (Arizona State University) , Candace Chan (Max-Planck-Institut für Kohlenforschung)
Co-authored by industrial partner: No

Type: Journal Paper
Journal: Journal Of Materials Chemistry A , VOL 43

State: Published (Approved)
Published: August 2020
Diamond Proposal Number(s): 23152

Open Access Open Access

Abstract: 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.

Diamond Keywords: Batteries; Solid-State Batteries (SSB)

Subject Areas: Materials, Chemistry

Instruments: I15-1-X-ray Pair Distribution Function (XPDF)

Added On: 13/08/2020 09:02


Discipline Tags:

Physical Chemistry Energy Energy Storage Materials Science Energy Materials Chemistry

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Diffraction Scattering Pair Distribution Function (PDF)