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Quantitative phase-field modeling of dendritic electrodeposition
1Samsung Advanced Institute of Technology America, Cambridge, Massachusetts 02142, USA.
Summary
A new phase-field model simulates metal electrodeposition, revealing that reducing exchange current density suppresses harmful dendrite growth. This finding offers strategies for controlling dendrites in batteries.
Area of Science:
- Electrochemistry
- Materials Science
- Computational Modeling
Background:
- Electrochemical interfaces are crucial for metal electrodeposition.
- Dendrite formation during electrodeposition poses challenges in applications like batteries.
- Existing models often struggle with experimental length and time scales.
Purpose of the Study:
- To develop a thin-interface phase-field model for electrochemical interfaces.
- To simulate and understand metal dendrite growth during electrodeposition.
- To identify strategies for controlling dendrite formation.
Main Methods:
- Developed a phase-field model based on Marcus kinetics for concentrated solutions.
- Utilized the grand electrochemical potential to widen the interface.
- Formulated electroneutrality to eliminate Debye length.
- Simulated zinc electrodeposition.
Main Results:
- Achieved quantitative agreement with experimental data for zinc electrodeposition kinetics.
- Validated model predictions for fractal growth dimension, tip velocity, and radius of curvature.
- Demonstrated that reducing exchange current density suppresses dendrite growth.
Conclusions:
- The developed model accurately captures key aspects of dendrite growth.
- Exchange current density is a critical parameter for controlling dendrite formation.
- Screening electrolytes by their exchange currents is a viable strategy for battery applications.
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