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Phase evolution in single-crystalline LiFePO4 followed by in situ scanning X-ray microscopy of a micrometre-sized battery

Author

Listed:
  • Nils Ohmer

    (Max Planck Institute for Solid State Research)

  • Bernhard Fenk

    (Max Planck Institute for Solid State Research)

  • Dominik Samuelis

    (Max Planck Institute for Solid State Research)

  • Chia-Chin Chen

    (Max Planck Institute for Solid State Research)

  • Joachim Maier

    (Max Planck Institute for Solid State Research)

  • Markus Weigand

    (Max Planck Institute for Intelligent Systems)

  • Eberhard Goering

    (Max Planck Institute for Intelligent Systems)

  • Gisela Schütz

    (Max Planck Institute for Intelligent Systems)

Abstract

LiFePO4 is one of the most frequently studied positive electrode materials for lithium-ion batteries during the last years. Nevertheless, there is still an extensive debate on the mechanism of phase transformation. On the one hand this is due to the small energetic differences involved and hence the great sensitivity with respect to parameters such as size and morphology. On the other hand this is due to the lack of in situ observations with appreciable space and time resolution. Here we present scanning transmission X-ray microscopy measurements following in situ the phase boundary propagation within a LiFePO4 single crystal along the (010) orientation during electrochemical lithiation/delithiation. We follow, on a battery-relevant timescale, the evolution of a two-phase-front on a micrometre scale with a lateral resolution of 30 nm and with minutes of time resolution. The growth pattern is found to be dominated by elastic effects rather than being transport-controlled.

Suggested Citation

  • Nils Ohmer & Bernhard Fenk & Dominik Samuelis & Chia-Chin Chen & Joachim Maier & Markus Weigand & Eberhard Goering & Gisela Schütz, 2015. "Phase evolution in single-crystalline LiFePO4 followed by in situ scanning X-ray microscopy of a micrometre-sized battery," Nature Communications, Nature, vol. 6(1), pages 1-7, May.
    • Handle: RePEc:nat:natcom:v:6:y:2015:i:1:d:10.1038_ncomms7045
    DOI: 10.1038/ncomms7045
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