无机材料学报 ›› 2022, Vol. 37 ›› Issue (2): 189-196.DOI: 10.15541/jim20210486

所属专题: 【能源环境】超级电容器,锂金属电池,钠离子电池和水系电池(202312)

• 研究论文 • 上一篇    下一篇

钠离子电池Na3Zr2Si2PO12陶瓷电解质的喷雾干燥法制备及性能优化

李榅凯, 赵宁, 毕志杰, 郭向欣   

  1. 青岛大学 物理科学学院, 青岛 266071
  • 收稿日期:2021-08-04 修回日期:2021-09-17 出版日期:2022-02-20 网络出版日期:2021-10-21
  • 作者简介:李榅凯(1996-), 男, 硕士研究生. E-mail: 1594070907@qq.com
  • 基金资助:
    国家自然科学基金(51771222, 22005163, 52002197); “泰山学者”计划(ts201712035); 青岛创业创新领军人才计划(193210zhc)

Na3Zr2Si2PO12 Ceramic Electrolytes for Na-ion Battery: Preparation Using Spray-drying Method and Its Property

LI Wenkai, ZHAO Ning, BI Zhijie, GUO Xiangxin   

  1. College of Physical Sciences, Qingdao University, Qingdao 266071, China
  • Received:2021-08-04 Revised:2021-09-17 Published:2022-02-20 Online:2021-10-21
  • Contact: ZHAO Ning, assistant professor. E-mail: n.zhao@qdu.edu.cn; GUO Xiangxin, professor. E-mail: xxguo@qdu.edu.cn
  • About author:LI Wenkai(1996-), male, Master candidate. E-mail: 1594070907@qq.com
  • Supported by:
    National Natural Science Foundation of China (51771222, 22005163, 52002197); Taishan Scholars Program (ts201712035); Project of Qingdao Talents in Entrepreneurship and Innovation (193210zhc)

摘要: 目前钠离子电池采用的有机电解液存在易燃易爆等安全隐患, 迫切需要开发高性能的固体电解质材料。其中NASICON型Na3Zr2Si2PO12电解质具有宽电化学窗口、高机械强度、对空气稳定、高离子电导率等优点, 应用前景广阔。但已有研究的陶瓷生坯由于黏结剂包覆不均匀导致生坯内部气孔较多, 难以烧成高致密、高离子电导的陶瓷电解质。本研究采用喷雾干燥法, 在Na3Zr2Si2PO12颗粒表面均匀包覆黏结剂的同时对颗粒进行球形造粒, 实现颗粒接近正态分布的粒度级配, 从而有效提高了颗粒间接触、降低了陶瓷坯体的孔隙率。制备的Na3Zr2Si2PO12陶瓷电解质的致密度达到97.5%, 室温离子电导率达到6.96×10-4 S∙cm-1, 远高于常规方法的致密度(88.1%)和离子电导率(4.94×10-4 S∙cm-1)。

关键词: 固体电解质, 喷雾干燥法, 致密度, 离子电导率, Na3Zr2Si2PO12

Abstract: Na-ion batteries, which currently use flammable and explosive organic electrolytes, now urgently need to develop high performance sodium ion solid electrolyte to realize more safe and practical application. Na3Zr2Si2PO12 is one of the most promising solid sodium electrolytes for its wide electrochemical window, high mechanical strength, superior air stability and high ionic conductivity. But its inhomogeneous mixing of the ceramic particles with the binders causing much more pores in the green bodies makes it difficult to obtain high-density and high-conductivity ceramic electrolytes after sintering. Herein, the spray drying method was used to enable Na3Zr2Si2PO12 particles uniformly coated with binders and granulated into spherical secondary ones. The as-prepared normal distributed particles can effectively contact each other and reduce porosity of ceramic green body. After sintering, Na3Zr2Si2PO12 ceramic pellets via the spray drying show relative density of 97.5% and ionic conductivity of 6.96×10-4 S∙cm-1 at room temperature. In contrast, the relative density and room-temperature ionic-conductivity of Na3Zr2Si2PO12 ceramic pellets prepared without the spray-drying are only 88.1% and 4.94×10-4 S∙cm-1, respectively.

Key words: solid electrolyte, spray-drying method, density, ionic conductivity, Na3Zr2Si2PO12

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