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Area of Science:

  • Materials Science
  • Electrochemistry
  • Nanotechnology

Background:

  • Lithium-ion batteries (LIBs) are crucial for energy storage.
  • Anode material degradation limits LIB performance and lifespan.
  • Dual-phase alloy systems, such as silicon/iron-silicide (Si/FeSi2) nano-composites, offer potential solutions for enhanced anode materials.

Purpose of the Study:

  • To investigate the multi-scale structural evolution of amorphous silicon (a-Si)/crystalline iron-silicide (c-FeSi2) nano-composite anodes during lithium-ion battery cycling.
  • To understand the relationship between material morphology changes, lithiation inhomogeneity, and the proximate pore network.
  • To correlate structural ageing with electrochemical performance degradation in LIBs.

Main Methods:

  • Multi-scale characterization employing scattering and 2D/3D imaging techniques (nm to μm scales).
  • Analysis of anode structural ageing after up to 300 charge-discharge cycles.
  • Integration of experimental imaging data with computational modeling.

Main Results:

  • Quantified insights into inhomogeneous lithiation within the active material due to cycling-induced morphology changes.
  • Characterization of the evolution of the a-Si/c-FeSi2 nanoscale phase and its impact on the pore network.
  • Demonstration of the critical role of the anode's architectural proximity in electrochemical performance.

Conclusions:

  • The structural evolution and morphological changes of Si/FeSi2 nano-composite anodes significantly influence their electrochemical performance.
  • Understanding the interplay between material structure, lithiation behavior, and pore network dynamics is key to designing stable and high-performance LIB anodes.
  • Anode architecture plays a vital role in overall LIB performance, beyond the intrinsic properties of the active material.