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Fast interfacial ionic conduction in nanostructured glass ceramics.

André Schirmeisen1, Ahmet Taskiran, Harald Fuchs

  • 1Center for Nanotechnology (CeNTech), Westfälische Wilhelms-Universität Münster, Heisenbergstrasse 11, 48149 Münster, Germany. schirmeisen@uni-muenster.de

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Nanostructured solid electrolytes show enhanced ionic conductivity due to interfacial ion movement. Time-domain electrostatic force spectroscopy revealed three distinct dynamic processes, including a low-activation energy interfacial process crucial for conductivity in LiAlSiO4 glass ceramics.

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Area of Science:

  • Materials Science
  • Solid-State Chemistry
  • Nanotechnology

Background:

  • Nanostructured materials offer potential for enhanced ionic conductivity in solid electrolytes.
  • Understanding ion transport mechanisms at the nanoscale is critical for designing advanced energy storage devices.
  • Lithium aluminum silicate (LiAlSiO4) glass ceramics are promising solid electrolyte materials.

Purpose of the Study:

  • To characterize the hopping movements of mobile ions in nanostructured LiAlSiO4 glass ceramic.
  • To investigate the relationship between nanostructure and ionic conductivity.
  • To identify and differentiate dynamic processes contributing to ion transport.

Main Methods:

  • Utilized time-domain electrostatic force spectroscopy (TDEFS) for nanoscopic characterization.
  • Analyzed macroscopic conductivity spectra to determine activation energies.
  • Correlated TDEFS findings with conductivity data to elucidate ion transport mechanisms.

Main Results:

  • Macroscopic conductivity spectra showed a single activation energy.
  • Nanoscopic TDEFS measurements revealed three distinct dynamic processes with different activation energies.
  • A third process with very low activation energy was identified, attributed to ionic movements at interfaces between crystalline and glassy phases.

Conclusions:

  • Interfacial ion transport processes in nanostructured solid electrolytes play a crucial role in achieving high ionic conductivities.
  • The identified interfacial process in LiAlSiO4 glass ceramics is key to its enhanced performance.
  • TDEFS is a powerful technique for probing nanoscale ion dynamics in complex materials.