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<p>The thermal transport properties of Na<sub>3</sub>Zr<sub>2</sub>Si<sub>2</sub>PO<sub>12</sub> (NZSP), a NaSICON-type solid electrolyte widely explored for solid-state sodium-ion batteries, are investigated in this work. Specific heat and thermal conductivity measurements were conducted from cryogenic to high temperatures to elucidate the phonon transport behavior. NZSP exhibits a Debye temperature of 370&#xa0;K and a sound velocity of 2962&#xa0;m·s<sup>−1</sup>, reflecting a relatively soft lattice. A peak in thermal conductivity is observed near 95&#xa0;K, followed by a plateau above ~ 200&#xa0;K, where the thermal conductivity approaches the amorphous limit. The room-temperature thermal conductivity is measured to be 1.01 ± 0.06 W·m<sup>−1</sup>·K<sup>−1</sup>. The calculated Grüneisen parameter for NZSP is 0.70. At low temperatures, the thermal conductivity of NZSP falls between those of NaZr<sub>2</sub>(PO<sub>4</sub>)<sub>3</sub> and Na<sub>4</sub>Zr<sub>2</sub>Si<sub>3</sub>O<sub>12</sub>, consistent with the trend in Grüneisen parameters. These results indicate that NZSP exhibits intermediate lattice anharmonicity, likely arising from the partial occupancy of sodium sites. This study provides valuable insights into thermal transport in sodium-ion solid electrolytes, which are essential for effective thermal management and the development of high-performance solid-state sodium-ion batteries.</p> Graphical abstract <p></p>

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Low thermal conductivity and lattice anharmonicity of NaSICON-type solid electrolyte Na3Zr2Si2PO12

  • 期刊论文

  • 发表日期：

    2025年11月3日

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  • Yi-Tian Wang,
  • Qian-Ru Jia,
  • Shu-Chen Li,
  • Li Shi,
  • Yu-Tao Li,
  • Xi Chen

摘要

The thermal transport properties of Na3Zr2Si2PO12 (NZSP), a NaSICON-type solid electrolyte widely explored for solid-state sodium-ion batteries, are investigated in this work. Specific heat and thermal conductivity measurements were conducted from cryogenic to high temperatures to elucidate the phonon transport behavior. NZSP exhibits a Debye temperature of 370 K and a sound velocity of 2962 m·s−1, reflecting a relatively soft lattice. A peak in thermal conductivity is observed near 95 K, followed by a plateau above ~ 200 K, where the thermal conductivity approaches the amorphous limit. The room-temperature thermal conductivity is measured to be 1.01 ± 0.06 W·m−1·K−1. The calculated Grüneisen parameter for NZSP is 0.70. At low temperatures, the thermal conductivity of NZSP falls between those of NaZr2(PO4)3 and Na4Zr2Si3O12, consistent with the trend in Grüneisen parameters. These results indicate that NZSP exhibits intermediate lattice anharmonicity, likely arising from the partial occupancy of sodium sites. This study provides valuable insights into thermal transport in sodium-ion solid electrolytes, which are essential for effective thermal management and the development of high-performance solid-state sodium-ion batteries.

Graphical abstract