In this work, the synthesis of Na₃Zr₂Si₂PO₁₂ (NZSP) solid electrolytes is demonstrated through a low temperature and rapid microwave sintering process and its application in Na-ion batteries is investigated. The quickly and uniformly heating of microwave sintering can inhibit the excessive grain growth significantly, resulting in the fine grained NZSP electrolyte with high relative density of 96%. The obtained NZSP electrolyte sintered by microwave heating at 850 °C for 30 min shows high room temperature ionic conductivity of 2.511 × 10⁻⁴ S cm⁻¹, which is comparable to that of sample synthesized by solid-state sintering method at 1200 °C for 720 min. The application of the resultant NZSP electrolyte in Na-ions batteries is evaluated by assembling Na₃V₂(PO₄)₃/C|NZSP|Na solid sodium battery. Discharge specific capacity of 75.7 mAh g⁻¹ with a capacity retention rate of 81.97% is recorded after 100 cycles at 0.5C. This work reports the microwave sintering synthesis of NZSP solid electrolyte with fascinating advantages of energy-saving and time-saving, driving the application of inorganic solid electrolyte in solid batteries.

在这项工作中，通过低温快速微波烧结工艺演示了Na ₃ Zr ₂ Si ₂ PO ₁₂（NZSP）固体电解质的合成，并研究了其在Na离子电池中的应用。快速而均匀地加热微波烧结可以显着抑制晶粒的过度生长，从而产生具有96％的高相对密度的细粒NZSP电解质。通过在850°C微波加热烧结30分钟而获得的NZSP电解质显示出2.511×10 ^-4  S cm ^-1的高室温离子电导率与在1200°C 720分钟下通过固态烧结法合成的样品相当。通过组装Na ₃ V ₂（PO ₄）₃ / C | NZSP | Na固体钠电池，评估所得NZSP电解质在Na离子电池中的应用。在0.5C下循环100次后，记录了放电比容量为75.7mAh g ^-1，容量保持率为81.97％。这项工作报道了NZSP固体电解质的微波烧结合成方法，具有节能省时的迷人优点，推动了无机固体电解质在固体电池中的应用。