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Ab initio diffuse-interface model for lithiated electrode interface evolution.

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Summary
This summary is machine-generated.

Predicting chemical segregation at interfaces is challenging. This study combines analytical expressions with ab initio calculations to determine lithium segregation layer thickness at Li-Si-Cu interfaces, aiding novel material design.

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Area of Science:

  • Materials Science
  • Computational Materials Science
  • Surface Science

Background:

  • Chemical segregation at interfaces is critical for heterostructured materials.
  • Predicting segregated layer thickness is a significant challenge.
  • Phase-field (PF) methodology relies on experimentally inaccessible parameters like interfacial energy and thickness.

Purpose of the Study:

  • To develop a bottom-up approach for calculating the gradient energy parameter (κ) and segregated layer thickness (λ).
  • To combine analytical expressions with ab initio calculations for quantitative interface modeling.
  • To provide a framework for evaluating thermodynamic parameters in phase-field models for Li-ion batteries.

Main Methods:

  • Utilized analytical expressions derived from the Cahn-Hilliard approach.
  • Integrated ab initio calculations to determine material properties.
  • Applied this combined scheme to the Li segregation at the LiₓSi-Cu interface.

Main Results:

  • Calculated the diffuse interface thickness (λ) of the lithium layer to be a few nanometers.
  • Results align with experimental secondary ion mass spectrometry observations.
  • Determined that solution thermodynamics primarily drives Li segregation, with a minor strain contribution.

Conclusions:

  • The combined analytical and ab initio approach enables quantitative prediction of interface properties.
  • This method offers a systematic way to evaluate phase-field model thermodynamic parameters.
  • The framework is applicable to developing advanced interface models for Li-ion battery applications.