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  4. Influence of R=Y, Gd, Sm on crystallization and sodium ion conductivity of Na5RSi4O12 phase
 
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2022
Journal Article
Titel

Influence of R=Y, Gd, Sm on crystallization and sodium ion conductivity of Na5RSi4O12 phase

Abstract
New sodium-based battery concepts require solid electrolytes as ion conducting separators. Besides NaSICON and b-Al2O3 in the Na2O-R2O3-SiO2 system (R = rare earth), a rarely noticed glass-ceramic solid electrolyte with the composition Na5RSi4O12 (N5-type) exists. The present study addresses the investigation of the ionic conductivity of Na5RSi4O12 solid electrolytes sintered from pre-crystallized glass-ceramic powders. The sintering behavior (optical dilatometry), the microstructure (SEM/EDX), and phase composition (XRD), as well as electrochemical properties (impedance spectroscopy), were investigated. To evaluate the effect of the ionic radii, Y, Sm and Gd rare elements were chosen. All compositions were successfully synthesized to fully densified compacts having the corresponding conducting N5-type phase as the main component. The densification behavior was in agreement with the melting point, which decreased with increasing ionic radii and specific cell volume. Alternatively, the ionic conductivities of N5-phases decreased from Y to Gd and Sm containing samples. The highest ionic conductivity of 1.82·10-3 S cm-1 at 20 °C was obtained for Na5YSi4O12 composition. The impact of grain boundaries and bulk conductivity on measured values is discussed. A powder-based synthesis method of this glass-ceramic solid electrolyte using different rare earth elements opens possibilities for optimizing ionic conductivity and scalable technological processing by tape casting.
Author(s)
Schilm, Jochen
Fraunhofer-Institut für Keramische Technologien und Systeme IKTS
Anton, Rafael
Fraunhofer-Institut für Keramische Technologien und Systeme IKTS
Wagner, Dörte
Fraunhofer-Institut für Keramische Technologien und Systeme IKTS
Hüttl, Juliane
Fraunhofer-Institut für Keramische Technologien und Systeme IKTS
Kusnezoff, Mihails
Fraunhofer-Institut für Keramische Technologien und Systeme IKTS
Herrmann, Mathias
Fraunhofer-Institut für Keramische Technologien und Systeme IKTS
Kim, Hong Ki
Kyung-Hee-Universität
Lee, Chang Woo
Kyung-Hee-Universität
Zeitschrift
Materials
Funder
Bundesministerium für Bildung und Forschung BMBF (Deutschland)
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DOI
10.3390/ma15031104
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English
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Fraunhofer-Institut für Keramische Technologien und Systeme IKTS
Tags
  • sodium solid state el...

  • ionic conductivity

  • sodium solid state ba...

  • glass ceramics proces...

  • impedance spectroscop...

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