J. Mater. Sci. Technol. ›› 2023, Vol. 157: 154-162.DOI: 10.1016/j.jmst.2023.01.054

• Research Article • Previous Articles     Next Articles

Superior plating/stripping performance through constructing an artificial interphase layer on metallic Mg anode

Bangpeng Yanga,b, Liuyan Xiaa,b, Rong Lia,b, Guangsheng Huanga,b,*, Shuangshuang Tana,b, Zhongting Wanga,b,*, Baihua Qua,b, Jingfeng Wanga,b, Fusheng Pana,b   

  1. aCollege of Materials Science and Engineering, Chongqing University, Chongqing 400044, China;
    bNational Engineering Research Center for Magnesium Alloys, College of Materials Science and Engineering, Chongqing University, Chongqing 400044, China
  • Received:2022-10-20 Revised:2023-01-16 Accepted:2023-01-30 Published:2023-09-10 Online:2023-09-07
  • Contact: *College of Materials Science and Engineering, Chongqing University, Chongqing 400044, China. E-mail addresses: gshuang@cqu.edu.cn (G. Huang), wang.zhongting@cqu.edu.cn (Z. Wang).

Abstract: Rechargeable magnesium batteries (RMBs) have attracted tremendous attention in energy storage applications in term of high abundance, high specific capacity and remarkable safety of metallic magnesium (Mg) anode. However, a serious passivation of Mg anode in the conventional electrolytes leads to extremely poor plating/stripping performance, further hindering its applications. Herein, we propose a convenient method to construct an artificial interphase layer on Mg anode by substitution and alloying reactions between SbCl3 and Mg. This Sb-based artificial interphase layer containing mainly MgCl2 and Mg3Sb2 endows the significantly improved interfacial kinetics and electrochemical performance of Mg anode. The overpotential of Mg plating/stripping in conventional Mg(TFSI)2/DME electrolytes is vastly reduced from over 2 V to 0.25-0.3 V. Combining experiments and calculations, we demonstrate that under the uniform distribution of MgCl2 and Mg3Sb2, an electric field with a favorable potential gradient is formed on the anode surface, which enables swift Mg2+ migration. Meanwhile, this layer can inhibit the decomposition of electrolytes to protect anode. This work provides an in-depth exploration of the artificial solid-electrolyte interface (SEI) construction, and a more achievable and safe path to realize the application of metallic Mg anode in RMBs.

Key words: Rechargeable magnesium batteries, Metallic Mg anode, Artificial solid-electrolyte interface, Interfacial modification, Anode protection