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Lecture

Relationships between sintering method, microstructure and conductivity: the case of NASICON





Scandium-substituted NASICON (Na3.4Sc0.4Zr1.6Si2PO12) is a promising electrolyte material for sodium-ion solid

state batteries, with the highest ionic conductivity reported to date for a NASICON material. Low-temperature

densification and control of microstructure are important factors to enable the low-cost manufacturing of such

new battery type [1]. Non-conventional sintering techniques such as Field Assisted Sintering Technology / Spark

Plasma Sintering (FAST/SPS) and Cold Sintering are therefore investigated and compared to conventional free

sintering. FAST/SPS enables to get rapidly dense samples at lower temperatures than the ones required

by conventional sintering routes and with similar electrical properties. Cold sintering experiments, involving the

addition of aqueous solutions as sintering aids and high mechanical pressure, enable a moderate densification,

but at temperatures as low as 250 °C. Further heat treatments still below the conventional sintering temperature

increased the achieved density and ionic conductivity [2].

References:

[1] S. Naqash et al., Microstructure–conductivity relationship of Na3Zr2(SiO4)2(PO4) ceramics, Journal of the American Ceramic Society, 2019

[2] J. Pereira da Silva et al., Sintering of a sodium-based NASICON electrolyte: a comparative study between cold, field assisted and conventional sintering methods, Journal of the European Ceramic Society, 2019


 

Speaker:
Prof. Dr. Olivier Guillon
Forschungszentrum Jülich GmbH
Additional Authors:
  • Dr. Sahir Naqash
  • Joao Pereira da Silva
    Forschungszentrum Jülich GmbH
  • Dr. Qianli Ma
    Forschungszentrum Jülich GmbH
  • Prof. Alexander Laptev
    Forschungszentrum Jülich GmbH
  • Dr. Doris Sebold
    Forschungszentrum Jülich GmbH
  • Dr. Frank Tietz
    Forschungszentrum Jülich GmbH
  • Prof. Jesus Gonzalez
    Forschungszentrum Jülich GmbH
  • Dr. Martin Bram
    Forschungszentrum Jülich GmbH