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NaZr2(PO4)3 - a cubic langbeinite-type sodium-ion solid conductor.

Sergey N Marshenya1, Alexey G Scherbakov1, Artem D Dembitskiy1

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Researchers synthesized langbeinite-type sodium zirconium phosphate (NaZr2(PO4)3) for solid electrolytes. This material exhibits good Na+ conductivity and electrochemical stability, crucial for sodium-ion batteries.

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Area of Science:

  • Materials Science
  • Solid-State Chemistry
  • Electrochemistry

Background:

  • Synthesizing langbeinite-type phosphates with small cations like sodium (Na+) is difficult due to NaSICON phase formation.
  • High-temperature solid-state reactions often yield undesired phases, hindering the development of novel solid electrolytes.

Purpose of the Study:

  • To develop a synthesis route for langbeinite-type sodium zirconium phosphate (NaZr2(PO4)3).
  • To investigate the crystal structure, thermal behavior, and sodium-ion (Na+) conductivity of the synthesized material.
  • To evaluate its potential as a solid electrolyte for sodium-ion batteries.

Main Methods:

  • Mechanochemically activated ion-exchange reaction between ammonium zirconium phosphate (NH4Zr2(PO4)3) and sodium nitrate (NaNO3).
  • X-ray diffraction (XRD) for crystal structure refinement.
  • Fourier-transformed infrared spectroscopy (FTIR) for validation.
  • Thermal analysis (up to 730 °C).
  • Electrochemical impedance spectroscopy (EIS) for conductivity measurements.
  • Density functional theory (DFT) calculations for bandgap and electrochemical stability.

Main Results:

  • Successfully synthesized langbeinite-type NaZr2(PO4)3 via a mechanochemical ion-exchange route.
  • NaZr2(PO4)3 exhibits stability up to 730 °C, with negative thermal expansion between 25-500 °C.
  • Achieved Na+ conductivity of 1 × 10^-6 S cm^-1 at 225 °C with low electronic conductivity and a wide electrochemical stability window (1.39-4.18 V vs. Na/Na+).

Conclusions:

  • Langbeinite-type NaZr2(PO4)3 is a promising candidate for solid electrolytes in sodium-ion batteries.
  • The developed synthesis method overcomes challenges associated with langbeinite-type phosphate synthesis.
  • Further research into langbeinite-structured phosphates could lead to advanced battery materials.