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Reassessment of Electrical and Dielectric Properties in the Borophosphate Glass System: A Promising Solid Electrolyte for High-Temperature Batteries

  • 0Faculty of Sciences Ben M'sik, Laboratory of Physical-Chemistry, Materials and Catalysis (LCPMC), University Hassan II of Casablanca, 20670 Casablanca, Morocco.
The Journal of Physical Chemistry. B +

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August 28, 2024

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August 28, 2024

View abstract on PubMed

Summary

This summary is machine-generated.

This study reveals high-temperature electrical properties of sodium borophosphate glasses, identifying a promising solid electrolyte for batteries. Enhanced ionic mobility is linked to network structure and free volume expansion.

Area Of Science

  • Materials Science
  • Solid-State Chemistry
  • Electrochemistry

Background

  • Ternary sodium borophosphate glasses are explored for solid electrolyte applications.
  • Understanding high-temperature electrical and dielectric properties is crucial for battery performance.

Purpose Of The Study

  • Investigate the conduction mechanism in sodium borophosphate glasses at high temperatures.
  • Evaluate their potential as solid electrolytes in high-temperature batteries.
  • Analyze the relationship between glass structure, electrical properties, and ionic mobility.

Main Methods

  • Synthesized ternary sodium borophosphate glasses (30Na2O-(70-x)B2O3-xP2O5).
  • Measured high-temperature electrical conductivity and dielectric properties.
  • Analyzed glass structure and correlated it with conduction mechanisms using the large-polaron (QMT) model.

Main Results

  • A glass composition with B2O3/P2O5 = 1 showed conductivity ~10^-4 S/cm at 250 °C.
  • Dielectric analysis indicated favorable properties for ionic conduction.
  • Discontinuity in glass transition temperature at 14 mol % P2O5 linked to depolymerization and NBO formation.
  • Ionic mobility continuously enhanced with molar volume, driven by free volume and reduced Coulombic effects.

Conclusions

  • Sodium borophosphate glasses exhibit promising high-temperature conductivity for solid electrolyte applications.
  • Conduction mechanism is explained by the large-polaron tunneling model.
  • Network structure, depolymerization, and free volume significantly influence ionic mobility and overall performance.