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Insensitive Nuclei Enhanced by Polarization Transfer (INEPT)01:15

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Lithium diffusion in lithium nitride by pulsed-field gradient NMR.

Zhongli Wang1, Mallory Gobet, Vincent Sarou-Kanian

  • 1CNRS-CEMHTI, 1D, Avenue de la Recherche Scientifique, 45071 Orléans cedex 2, France.

Physical Chemistry Chemical Physics : PCCP
|September 12, 2012
PubMed
Summary

This study measured lithium self-diffusion in α-Li(3)N using Pulsed-Field Gradient Nuclear Magnetic Resonance. Lithium ion diffusion is anisotropic, with a low activation energy within the Li(2)N layers.

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Area of Science:

  • Solid-state chemistry
  • Materials science
  • Nuclear magnetic resonance spectroscopy

Background:

  • Lithium nitride (Li3N) is a promising solid electrolyte for lithium-ion batteries.
  • Understanding lithium ion diffusion mechanisms is crucial for optimizing solid electrolyte performance.
  • Previous studies have explored lithium diffusion in Li3N, but direct measurement in crystalline powder is limited.

Purpose of the Study:

  • To quantify lithium self-diffusion coefficients in crystalline α-Li(3)N powder.
  • To investigate the anisotropic nature of lithium ion diffusion.
  • To determine the activation energy for lithium diffusion within the Li(2)N layers.

Main Methods:

  • Utilized (7)Li Pulsed-Field Gradient Nuclear Magnetic Resonance (PFG-NMR) spectroscopy.
  • Performed measurements on crystalline α-Li(3)N powder across a temperature range of 534 K to 774 K.
  • Analyzed NMR data to extract diffusion coefficients and activation energies.

Main Results:

  • Successfully measured lithium self-diffusion coefficients for the first time in α-Li(3)N powder.
  • Demonstrated that lithium cation diffusion is anisotropic.
  • Determined an activation energy of 0.150 ± 0.009 eV for diffusion within the Li(2)N layers.

Conclusions:

  • The PFG-NMR technique provides a reliable method for studying lithium diffusion in solid electrolytes.
  • The anisotropic diffusion and low activation energy highlight the potential of α-Li(3)N as a fast lithium-ion conductor.
  • Further research can leverage these findings to design advanced solid-state batteries.