Energy Storage Science and Technology ›› 2020, Vol. 9 ›› Issue (5): 1284-1299.doi: 10.19799/j.cnki.2095-4239.2020.0119

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Research progress on NASICON-structured sodium solid electrolytes and their derived solid state sodium batteries

Jing YANG1(), Gaozhan LIU1,2, Lin SHEN1,2, Xiayin YAO1,2()   

  1. 1.Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences, Ningbo 315201, Zhejiang, China
    2.University of Chinese Academy of Sciences, Beijing 100049, China
  • Received:2020-03-25 Revised:2020-04-02 Online:2020-09-05 Published:2020-09-08
  • Contact: Xiayin YAO E-mail:yangjing@nimte.ac.cn;yaoxy@nimte.ac.cn

Abstract:

Owing to the low cost and abundance of sodium sources, sodium-ion batteries are considered one of the most competitive alternatives to lithium-ion batteries. However, the application of flammable organic liquid electrolytes in sodium ion batteries has potential safety hazards, including leakage, combustion, and even explosion. Due to its high safety, good stability, low cost, and environmental friendliness, NASICON-structured solid electrolytes can replace liquid electrolytes and separators to realize solid-state sodium batteries; this is becoming a new research hotspot in the field of energy storage. However, the ionic conductivity of NASICON-structured solid electrolytes needs to be further improved and high interface resistance between electrodes and solid electrolytes currently limit its further application. In this short review, the major crystalline structures and the sodium-ion migration mechanism of the NASICON-structured solid electrolyte are introduced and the main factors affecting the bulk conductivity and grain boundary conductivity are analyzed. Strategies to improve the bulk conductivity and grain boundary conductivity in recent years are summarized, showing that proper ion substitution and improvements in the phase purity and density are effective ways to improve the ionic conductivity. In addition, challenges for interface engineering and some interfacial modification methods in NASICON-structured solid electrolyte-based solid-state sodium batteries are presented, indicating that the exploration of novel modified materials and composite electrolytes is expected to further improve the interface properties. Finally, possible research directions and development trends of NASICON-structured solid electrolyte-based solid-state sodium batteries are discussed.

Key words: sodium solid electrolyte, NASICON structure, ionic conductivity, interfacial modification, solid state sodium battery

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