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Diffusional Priority Enables Kinetic 6Li Selectivity in a Covalent Organic Framework.

Sinan Chen1, Haotian Tan1, Ze Qiu1

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Lithium isotope separation is challenging due to similar properties. Kinetic factors, like faster diffusion of lighter 6Li, drive adsorption, overriding thermodynamic preferences for 7Li.

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Area of Science:

  • Materials Science
  • Chemical Engineering
  • Physical Chemistry

Background:

  • Lithium isotope (6Li/7Li) separation is crucial for applications like nuclear energy and batteries.
  • Existing adsorption methods struggle to explain the observed preference for 6Li over 7Li, often relying solely on thermodynamic affinity.

Purpose of the Study:

  • To investigate the contributions of equilibrium binding and nonequilibrium transport processes in lithium isotope separation using a crown ether-functionalized covalent organic framework.
  • To elucidate the mechanisms behind the experimentally observed preference for 6Li adsorption.

Main Methods:

  • Density Functional Theory (DFT) calculations to determine thermodynamic preferences.
  • Batch adsorption experiments to observe isotope separation behavior.
  • Analysis of kinetic factors including desolvation and diffusion.

Main Results:

  • DFT calculations indicated a slight thermodynamic preference for 7Li complexation.
  • Batch experiments unexpectedly showed a preference for 6Li adsorption.
  • 6Li's higher zero-point energy and lower mass facilitate faster diffusion and kinetically favored coordination.

Conclusions:

  • Nonequilibrium transport processes, specifically faster diffusion of 6Li, play a critical role in adsorption-based lithium isotope separation.
  • Kinetic factors can override thermodynamic preferences in isotope separation.
  • Understanding these kinetic effects is essential for designing efficient lithium isotope separation strategies.