Energy Storage Science and Technology ›› 2023, Vol. 12 ›› Issue (5): 1380-1391.doi: 10.19799/j.cnki.2095-4239.2023.0324

• Special Issue on Key Materials and Recycling Technologies for Energy Storage Batteries • Previous Articles     Next Articles

Research progress on sodium metal anode modified by artificial interface layer

Yongshi YU1(), Xianming XIA1, Hongyang HUANG1, Yu YAO2, Xianhong RUI1, Guobin ZHONG3, Wei SU3(), Yan YU2()   

  1. 1.School of Materials and Energy, Guangdong University of Technology, Guangzhou 510006, Guangdong, China
    2.Department of Materials Science and Engineering, University of Science and Technology of China, Hefei 230026, Anhui, China
    3.China Southern Powergrid Technology Co. , Ltd. , Guangzhou 510080, Guangdong, China
  • Received:2023-05-06 Revised:2023-05-15 Online:2023-05-05 Published:2023-05-29
  • Contact: Wei SU, Yan YU E-mail:2112102083@mail2.gdut.edu.cn;jxhwsu@163.com;yanyumse@ustc.edu.cn

Abstract:

Sodium metal anode is considered as the superior anode material due to its high specific capacity, low redox potential, and abundant resources. However, the problems of unstable solid electrolyte interface (SEI) and sodium dendritic growth have seriously hindered its practical application. It is thus essential to adopt appropriate strategies to achieve stable and efficient use of sodium metal anode. Generally, the construction of an artificial interface layer on the surface of the sodium metal anode can not only effectively achieve uniform sodium deposition, but also effectively mitigate the volume change and sodium dendrite growth during the electrochemical process. Therefore, this review focuses on the research progress on sodium metal anode modified by artificial interface layer. Firstly, the basic properties of spontaneously formed SEI films are discussed. Generally, they suffer from poor stability, poor toughness and low mechanical strength. To address these issues, the construction of inorganic, organic and inorganic-organic artificial interfacial layers to protect sodium metal anodes for dendrite-free sodium deposition/exfoliation is proposed. Sodium-contained inorganic materials usually have the advantages of high shear modulus, corrosion resistance, structural stability, and high ionic conductivity, but are brittle; organic materials usually have structural designability, functional group diversity, and high mechanical toughness, but are poorly stable; the inorganic-organic composite protective film combines the advantages of the above two and can build an artificial interface layer with excellent comprehensive performance. The implementation methods and modification effects of these three artificial interface films are elaborated in this paper. Finally, it is suggested to continuously optimize the artificial interfacial films as well as to use advanced characterization techniques, theoretical calculations and simulations to study the mechanisms of interfacial stability in depth.

Key words: sodium metal anode, sodium dendrite, solid electrolyte interface, artificial interfacial layer

CLC Number: