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Nanoscale Detection of Intermediate Solid Solutions in Equilibrated LiFePO Microcrystals. | LitMetric

AI Article Synopsis

  • Redox-driven phase changes in solids are important for enhancing lithium-ion battery performance as we move away from fossil fuels.
  • The study utilizes scanning X-ray diffraction microscopy (SXDM) to visualize battery processes in individual particles, revealing surprising solid solution domains in LiFePO crystals that were previously overlooked.
  • This research offers new insights into how strain and interfacial effects can modify phase behaviors, enhancing our understanding of the complex interactions involved in solid state transformations within battery materials.

Article Abstract

Redox-driven phase transformations in solids determine the performance of lithium-ion batteries, crucial in the technological transition from fossil fuels. Couplings between chemistry and strain define reversibility and fatigue of an electrode. The accurate definition of all phases in the transformation, their energetics, and nanoscale location within a particle produces fundamental understanding of these couplings needed to design materials with ultimate performance. Here we demonstrate that scanning X-ray diffraction microscopy (SXDM) extends our ability to image battery processes in single particles. In LiFePO crystals equilibrated after delithiation, SXDM revealed the existence of domains of miscibility between LiFePO and LiFePO. These solid solutions are conventionally thought to be metastable, and were previously undetected by spectromicroscopy. The observation provides experimental verification of predictions that the LiFePO-FePO phase diagram can be altered by coherency strain under certain interfacial orientations. It enriches our understanding of the interaction between diffusion, chemistry, and mechanics in solid state transformations.

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Source
http://dx.doi.org/10.1021/acs.nanolett.7b03086DOI Listing

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