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Related Experiment Video

Updated: May 10, 2026

The Diffusion of Passive Tracers in Laminar Shear Flow

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Multicomponent diffusion in molten LiCl-KCl: dynamical correlations and divergent Maxwell-Stefan diffusivities.

Brahmananda Chakraborty¹, Jin Wang, Jacob Eapen

¹Department of Nuclear Engineering, North Carolina State University, Raleigh, North Carolina 27695, USA.

Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics

|June 18, 2013

Summary

This study reveals complex diffusion in LiCl-KCl melts using molecular dynamics. It highlights unusual negative Maxwell-Stefan diffusivities for K-Li ion pairs, which still adhere to thermodynamic principles.

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Area of Science:

Physical Chemistry
Materials Science
Computational Chemistry

Background:

Understanding multicomponent diffusion is crucial for molten salt applications.
The LiCl-KCl system is a key electrolyte in various electrochemical technologies.
Previous studies have not fully elucidated the intricate diffusional mechanisms at the ionic level.

Purpose of the Study:

To investigate the multicomponent diffusional mechanisms in the LiCl-KCl ternary system.
To elucidate the behavior of ion pairs and their dynamics using advanced simulation techniques.
To analyze the Maxwell-Stefan diffusion matrix and its components under varying conditions.

Main Methods:

Utilizing the Green-Kubo formalism for theoretical analysis.
Performing equilibrium molecular dynamics simulations for atomic-level insights.
Evaluating the Maxwell-Stefan diffusion matrix from Onsager dynamical matrix components.

Main Results:

Observed pronounced cage dynamics for Li-Li and Li-Cl ion pairs, persisting at high temperatures.
Identified a sign change and divergent-like behavior in the K-Li Maxwell-Stefan diffusivity near the eutectic composition and specific temperatures.
Demonstrated that negative Maxwell-Stefan diffusivities are consistent with non-negative entropic constraints.

Conclusions:

The study provides a detailed understanding of multicomponent diffusion in LiCl-KCl melts.
Unusual negative diffusivities for specific ion pairs were observed and explained within thermodynamic frameworks.
The findings offer valuable insights for optimizing molten salt electrolytes in energy storage and other applications.