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Morphological evolution of Si nanowires upon lithiation: a first-principles multiscale model
Ekin D Cubuk1, Wei L Wang, Kejie Zhao
1School of Engineering and Applied Sciences, Harvard University, Cambridge, Massachusetts 02138, USA.
Nano Letters
|April 2, 2013
Summary
Lithium insertion into silicon nanowires creates unusual shapes due to dynamic, non-equilibrium processes. Simulations reveal specific reaction paths and energy barriers governing these morphological changes in lithium-ion battery anodes.
Area of Science:
- Materials Science
- Electrochemistry
- Computational Nanoscience
Background:
- Silicon anodes offer high capacity for lithium-ion batteries.
- Experimental lithiation of silicon nanowires shows anisotropic morphologies.
- Existing interpretations based on equilibrium energies are insufficient.
Purpose of the Study:
- To provide a comprehensive explanation for observed morphological changes during silicon nanowire lithiation.
- To elucidate the dynamic, non-equilibrium nature of the lithiation process.
- To identify reaction pathways and energy barriers for lithium insertion.
Main Methods:
- First-principles multiscale simulations.
- Density functional theory (DFT) calculations for energy barriers.
- Kinetic Monte Carlo (KMC) simulations.
Main Results:
- Identified specific reaction paths and structural transformations for Li insertion into Si {110} and {111} surfaces.
- Calculated energy barriers for Li insertion using DFT.
- KMC simulations reproduced experimental nanowire profiles and reaction front rates.
Conclusions:
- Anisotropic morphologies arise from non-equilibrium lithiation dynamics, not just equilibrium interface energies.
- The study provides a detailed mechanistic understanding of silicon anode lithiation.
- Simulation results align well with experimental observations, validating the multiscale approach.
