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Li diffusion in Si and LiSi: Nuclear quantum effects and anharmonicity.

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Area of Science:

  • Materials Science
  • Computational Chemistry
  • Solid-State Physics

Background:

  • Understanding lithium diffusion in silicon is crucial for advanced battery technologies.
  • Accurate modeling requires incorporating quantum mechanical and anharmonic effects.

Purpose of the Study:

  • To investigate lithium diffusion in bulk silicon and LiSi using first-principles calculations.
  • To quantify the impact of nuclear quantum effects and anharmonicity on diffusion coefficients.

Main Methods:

  • Density functional theory (DFT)
  • Transition state theory
  • Kinetic Monte Carlo (KMC) simulations
  • Incorporation of nuclear quantum effects via vibrational spectra
  • Quasi-harmonic approximation (QHA) and cBΩ model for anharmonicity

Main Results:

  • Quantum effects lower the Li diffusion coefficient in bulk Si by ~33% near room temperature compared to the classical limit.
  • Anharmonicity increases the Li diffusion coefficient in bulk Si by ~60%.
  • An effective diffusion barrier of 0.27 eV ± 0.01 eV was determined for Li diffusion in LiSi via multiple vacancy jumps.

Conclusions:

  • Nuclear quantum effects are significant for Li diffusion in silicon at lower temperatures.
  • Anharmonicity plays a substantial role in enhancing Li diffusion.
  • Quantum mechanical effects have a marginal impact at room temperature within the Li-Si system.