欢迎访问《人工晶体学报》官方网站,今天是 分享到:

人工晶体学报 ›› 2026, Vol. 55 ›› Issue (4): 634-641.DOI: 10.16553/j.cnki.issn1000-985x.2025.0212

• 研究论文 • 上一篇    下一篇

Sc2O3含量对钠快离子导体Na3Sc2(PO4)3固体电解质合成的影响

宋嘉恒(), 李国华(), 田琳, 张凯政   

  1. 辽宁科技大学材料与冶金学院,鞍山 114051
  • 收稿日期:2025-10-03 出版日期:2026-04-20 发布日期:2026-05-19
  • 通信作者: 李国华,副教授。E-mail:liguohuagui97@163.com
  • 作者简介:宋嘉恒(2002—),男,湖南省人,硕士研究生。E-mail:songjiahenglyqh@163.com

Effect of Sc2O3 Content on Synthesis of Sodium Fast-Ion Conductor Na3Sc2(PO4)3 Solid Electrolyte

SONG Jiaheng(), LI Guohua(), TIAN Lin, ZHANG Kaizheng   

  1. School of Material and Metallurgy,University of Science and Technology Liaoning,Anshan 114051,China
  • Received:2025-10-03 Online:2026-04-20 Published:2026-05-19

摘要: 本文以氧化钪、碳酸钠和磷酸二氢铵为原料,通过固相反应法合成NASICON型钠离子固体电解质Na3Sc2(PO43,研究了氧化钪含量对烧结性能、物相组成、微观结构和离子电导率的影响。利用X射线衍射仪(XRD)、扫描电子显微镜(SEM)对电解质进行了表征,采用电化学交流阻抗谱(EIS)进行了电化学性能测试。结果表明,氧化钪含量为21.49%(质量分数)时,材料呈现正比例NASICON型Na3Sc2(PO43,且结构致密、结晶度高、晶粒尺寸均匀,具有最大的晶胞体积,室温离子电导率最高,达8.79×10-6 S/cm。氧化钪过量会抑制晶粒生长,并形成钠缺陷Na2.63Sc2(PO43相,钠空位增多、晶格发生畸变,孔隙率上升,离子电导率下降;氧化钪不足则引起晶胞缩小和玻璃相覆盖晶界,阻碍离子迁移,同样不利于离子传输,降低离子电导率。因此,精确控制化学计量比对于优化NASICON型Na3Sc2(PO43电解质的结构和提高其离子电导率至关重要。

关键词: 钠离子电池; 固体电解质; Na3Sc2(PO43; 氧化钪; 离子电导率; 微观结构

Abstract: In this paper, NASICON-type sodium-ion solid electrolyte Na3Sc2(PO43 was synthesized by solid-state reaction method using scandium oxide, sodium carbonate and ammonium dihydrogen phosphate as raw materials. The effects of scandium oxide content on sintering properties, phase composition, microstructure and ionic conductivity were studied. The electrolytes were characterized using X-ray diffraction (XRD), scanning electron microscopy (SEM), and electrochemical performance was tested by electrochemical impedance spectroscopy (EIS). The results indicate that a proportional NASICON-type Na3Sc2(PO43 is obtained when the scandium oxide content is 21.49% (mass fraction), at which the synthesized materials exhibits a dense microstructure, high crystallinity, uniform grain size, and the largest unit cell volume. Consequently, it demonstrates the highest room-temperature ionic conductivity of 8.79×10-6 S/cm. An excess of scandium oxide inhibites grain growth and forms the sodium-deficient Na2.63Sc2(PO43 phase. The sodium vacancies increase, the lattice distortion occurs, the porosity increases, and the ionic conductivity decreases. The lack of scandium oxide causes cell shrinkage and glass phase covering grain boundaries, hindering ion migration, which is also not conducive to ion transport and reducing ion conductivity. Therefore, precise stoichiometric control is critical for optimizing the structure and enhancing the ionic conductivity of NASICON-type Na3Sc2(PO43 electrolytes.

Key words: sodium-ion battery; solid electrolyte; Na3Sc2(PO43; scandium oxide; ionic conductivity; microstructure

中图分类号: