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Related Experiment Videos

Anomalous ionic conductivity increase in Li2S + GeS2 + GeO2 glasses.

Youngsik Kim1, Jason Saienga, Steve W Martin

  • 1Department of Materials Science and Engineering, Iowa State University, 2220 Hoover Hall, Ames, Iowa 50011, USA.

The Journal of Physical Chemistry. B
|August 18, 2006
PubMed
Summary

The addition of germanium dioxide (GeO2) to sulfide glasses initially boosts ionic conductivity by widening cation pathways. However, excessive GeO2 addition contracts the glass structure, hindering ion movement and reducing conductivity in these materials for Li batteries.

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Area of Science:

  • Materials Science
  • Solid-state Chemistry
  • Electrochemistry

Background:

  • Oxide-doped chalcogenide glasses exhibit anomalous ionic conductivity behavior.
  • Initial oxide addition significantly increases conductivity, followed by a decrease with further additions.
  • Understanding this phenomenon is crucial for developing advanced Li battery electrolytes.

Purpose of the Study:

  • To investigate the ionic conductivity of oxide-doped chalcogenide glasses.
  • To elucidate the mechanism behind the anomalous conductivity changes.
  • To correlate structural changes with conductivity variations using the Anderson and Stuart model.

Main Methods:

  • Measurement of ionic conductivities in 0.5Li(2)S + 0.5[(1 - x)GeS(2) + xGeO(2)] glasses.
  • Analysis of activation energy changes with varying GeO(2) content.

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  • Application of the Anderson and Stuart model to interpret structural effects on conductivity.

    • Main Results:

    • A 5 mol% GeO(2) addition increased ionic conductivity from 4.3 x 10(-5) to 1.5 x 10(-4) (Omega cm)(-1) and decreased activation energy.
    • Further GeO(2) addition monotonically decreased conductivity and increased activation energy.
    • The 'doorway' radius between cation sites increased with initial oxide addition, facilitating ion transport.

    Conclusions:

    • The initial increase in conductivity is attributed to an increased 'doorway' radius, easing ion movement.
    • Subsequent oxide additions contract the glass structure, reducing the 'doorway' radius and conductivity.
    • The Anderson and Stuart model successfully explains the observed conductivity anomalies in these glasses.