中文摘要：

作为钠硫电池陶瓷电解质的核心材料, Na-β-Al2O3粉体对钠硫电池的性能影响很大。实验以聚乙烯吡咯烷酮（PVP）为络合剂, 合成了纳米 Na-β-Al2O3粉体。结果表明, 以 PVP 络合的前驱体形成 Na-β-Al2O3相的温度低至 900 ℃, 相比于传统固相合成法及其他化学合成法有显著的降低, 可有效抑制传统制备Na-β-Al2O3粉体方法中由于高温而导致 Na2O 组份的挥发, 从而避免 Na-β-Al2O3性能的下降。X射线衍射, 扫描电镜和透射电镜对粉体的分析表明, 所获得的粉体为纯相的 Na-β-Al2O3, 粉体粒径 60~70 nm, 分散性好。高分散性的纳米粉体有助于制备高致密度的 Na-β-Al2O3陶瓷。这种粉体制备烧结的 Na-β-Al2O3陶瓷的电导率在 350 ℃可达 0.22 S/cm。

英文摘要：

As the key material of the β-Al2O3 electrolyte of sodium sulfur battery（SSB）, the properties of Na-β-Al2O3 powders play an important role in the performance of SSB. In this study, nanosized Na-β-Al2O3 powders were prepared by Sol-Gel process with polyvinyl pyrrolidone （PVP） as the chelating agent. The phase formation temperature of the Na-β-Al2O3 by the PVP-based process was reduced to 900 ℃, which was much lower than those of conventional SSR and most chemical synthesis methods. The new method can effectively inhibit the performance decline of the Na-β-Al2O3 ce- ramics induced by the volatilization of Na20 at high temperature in the conventional method. The powders were charac- terized by XRD, SEM and TEM techniques. It was demonstrated that the phase was pure and the particles were well dis- persed with diameter of 60-70 nm, which were helpful to the good performance of Na-β-Al2O3 ceramics. In addition, the conductivities of the Na-β-Al2O3 ceramics sintered by the as-prepared powders were measured by AC impedance spec- troscope and the evaluation of the spectra was carried out with increasing temperature from room temperature to 350 ℃. The electrical conductivity of the ceramics at 350 ℃ reached 0.22 S/cm.