Citation: Sunbin Yang, Huanglin Dou, Feng Li, Jiajun Chen, Zhenxin Zhao, Xiaoming Qiu, Xiaomin Wang. Achieving internal reversible plating/stripping by designing three-dimensional magnesiophilic gradient conductivity scaffolds for rechargeable Mg batteries[J]. Chinese Chemical Letters, ;2026, 37(7): 111080. doi: 10.1016/j.cclet.2025.111080 shu

Achieving internal reversible plating/stripping by designing three-dimensional magnesiophilic gradient conductivity scaffolds for rechargeable Mg batteries

College of Materials Science and Engineering, Taiyuan University of Technology, Taiyuan 030024, China

wangxiaomin@tyut.edu.cn

Received Date: 25 January 2025
Revised Date: 3 March 2025
Accepted Date: 12 March 2025
Available Online: 13 March 2025

Figures(4)

The direct utilization of magnesium (Mg) metal as the anode of Mg batteries is significantly susceptible to passivation in conventional electrolytes, which critically hinders Mg plating and stripping. To address this issue, a synergistic effect of the three-dimensional (3D) scaffolds’ dispersive current strategy and the gradient conductivity artificial layer effectively promotes internal reversible Mg plating and stripping. In this study, we have synthesized 3D magnesiophilic gradient conductivity scaffolds (Sn@Ni), featuring an electronic insulation layer, uniform Mg²⁺ transport channels, and a high specific surface area, through in situ ion-exchange reactions. It is observed that the plate-like metal chloride insulation provides the necessary potential gradient to prevent electrolyte decomposition and Mg deposition on the surface. Furthermore, the magnesiophilic metal tin (Sn) effectively lowers the nucleation barrier of Mg, enhancing the uniform diffusion of Mg. Additionally, the high specific surface area of the nickel foam skeleton effectively mitigates current density and regulates Mg deposition behavior. As a result, the Sn@Ni 3D gradient conductivity scaffolds exhibit an exceptionally low Mg nucleation overpotential (52 mV) under 500 μA/cm². Moreover, the Sn@Ni-Mg gradient conductivity anode, produced by plating Mg onto Sn@Ni, demonstrates a symmetric cell capable of sustaining an ultra-long stable reversible cycle exceeding 2800 h (5300 cycles). Full cells with Mo₆S₈ cathode also show an impressive capacity retention of 95.6% after 500 cycles at 1 C. This breakthrough provides a novel approach to anode design, presenting potential advancements for next-generation Mg batteries.
- Mg metal anodes,
- Passivation,
- Artificial solid-electrolyte interface,
- Anode protection,
- Three dimensional materials
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