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In the region where two bulk phases meet, an intricate electric charge distribution arises due to charge transfer, ion adsorption, molecular orientation, and charge distortion. This complex distribution is commonly referred to as the electrical double layer.When a solid electrode interfaces with ions in an electrolyte solution, the speed of electron transfer dictates the rates of oxidation and reduction. The electrode acquires a charge through the escape of atoms into the solution as cations or...
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Li ion dynamics along the inner surfaces of layer-structured 2H-LixNbS2.

B Stanje1, V Epp, S Nakhal

  • 1Christian Doppler Laboratory for Lithium Batteries, and Institute for Chemistry and Technology of Materials (Member of NAWI Graz), Graz University of Technology , Stremayrgasse 9, A-8010 Graz, Austria.

ACS Applied Materials & Interfaces
|January 31, 2015
PubMed
Summary

Lithium-ion diffusion in layered transition metal sulfides was studied using (7)Li nuclear magnetic resonance (NMR) spectroscopy. Increasing lithium content in 2H-LixNbS2 shifts diffusion peaks to higher temperatures, indicating 2D jump diffusion.

Keywords:
NMRdimensionalityinsertion materialsjump diffusionrelaxation

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Area of Science:

  • Materials Science
  • Solid-State Chemistry
  • Electrochemistry

Background:

  • Layer-structured materials like graphite and Lix(Co,Ni,Mn)O2 are crucial for battery electrodes, enabling reversible alkali ion accommodation.
  • Microscopic insights into lithium ion self-diffusion within transition metal sulfides remain limited, hindering further battery development.

Purpose of the Study:

  • To investigate lithium ion dynamics and diffusion mechanisms in hexagonal 2H-LixNbS2 using advanced NMR techniques.
  • To correlate lithium content with diffusion rates and activation barriers in these layered sulfide materials.

Main Methods:

  • Utilized variable-temperature (7)Li nuclear magnetic resonance (NMR) relaxometry, including spin-lock techniques, to probe Li ion translational diffusion.
  • Analyzed (7)Li spin-lattice relaxation rates and NMR spectra to determine Li jump rates and activation energies.
  • Performed frequency-dependent Rρ measurements to assess diffusion dimensionality.

Main Results:

  • Observed a shift in the diffusion-induced rate peak maximum towards higher temperatures with increasing lithium content (x) in 2H-LixNbS2.
  • Identified a slight but measurable frequency dependence in relaxation rates at high temperatures, consistent with 2D diffusion.
  • Demonstrated the capability of NMR spin-lock relaxation to probe dynamics across different length scales.

Conclusions:

  • The study provides crucial microscopic understanding of Li ion diffusion in 2H-LixNbS2, revealing a 2D jump diffusion character.
  • Findings highlight the influence of lithium content on ion mobility and activation barriers in layered sulfides.
  • NMR relaxometry proves effective for elucidating ion diffusion mechanisms in battery materials.