X-ray Absorption Spectroscopy Study of the Lattice Site Occupancy of Bi Dopants in LiLaZrO Garnets

ORAL

Abstract

The garnet LiLaZrO is of great interest for solid-state electrolyte applications in energy storage devices. Dopants have been employed to stabilize the desired cubic phase with concomitant increments in ionic conductivity. We have obtained significant improvements the LiLaZrO ionic conductivity by Bi-doping. Taking advantage of the element specific nature of X-ray Absorption Spectroscopy (XAS), we have explored the site occupancy of bismuth additions to LLZO. XAS studies were carried out at beamline 20-BM (Advance Photon Source, Argonne National Laboratory). Analysis of the XAS data show that to within the accuracy of the measurement, bismuth additions occupy zirconium-type sites in the LLZO lattice. Additionally, bismuth perturbs the local environment of zirconium and lanthanum, and induces static disorder in the samples. Further details of the XAS experiment, analysis, and findings of the study will be discussed in the talk.

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Presenters

  • Ernesto Marinero

    Schools of Materials and Electrical and Computer Engineering, Purdue University, Schools of Materials and Computer Engineering, Purdue University

Authors

  • Mahalingam Balasubramanian

    X-ray Science Division, Argonne National Laboratory

  • Derek Schwanz

    School of Materials Engineering, Purdue University

  • Benjamin Helfrecht

    School of Materials Engineering, Purdue University

  • Ernesto Marinero

    Schools of Materials and Electrical and Computer Engineering, Purdue University, Schools of Materials and Computer Engineering, Purdue University