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Characterization of Electrode Materials for Lithium Ion and Sodium Ion Batteries Using Synchrotron Radiation Techniques
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Phase evolution of conversion-type electrode for lithium ion batteries.

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Conversion-type battery electrodes degrade due to internal passivation and surface layers forming during cycling. These layers create diffusion barriers, limiting electron transport and causing capacity fading in energy storage devices.

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Energy Storage

Background:

  • Conversion-type electrodes offer high energy density but face significant capacity fading.
  • Existing theories attribute fading to contact failure or solid electrolyte interphase layer breakdown.

Purpose of the Study:

  • Investigate the capacity fading mechanism in conversion-type electrode materials.
  • Understand the phase evolution of iron oxide composite structures during later-stage battery cycling.

Main Methods:

  • Utilized synchrotron X-ray absorption spectroscopy.
  • Employed in situ transmission electron microscopy.
  • Analyzed phase evolution in iron oxide composite electrodes during cycling.

Main Results:

  • Observed phase evolution during later-stage cycling differs significantly from initial lithiation.
  • Identified accumulative internal passivation and surface layers forming over cycles.
  • Demonstrated that these layers create a rate-limiting diffusion barrier for electron transport.

Conclusions:

  • Capacity degradation and poor rate capability in conversion-type materials are linked to electron transport barriers.
  • Microscopic phase evolution directly correlates with electrode performance.
  • Findings provide insights for designing improved conversion-type electrode materials for advanced batteries.