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Building Organic-Inorganic Robust Interphases from Deep Eutectic Solution for Highly Stable Mg Metal Anode in
Xuejun Zhou1,2, Guyue Li1,2,3, Yifan Yu1,2,3
1State Key Laboratory of High-Performance Ceramics and Superfine Microstructure, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai, 201899, China.
Small Methods
|December 7, 2023
Summary
A novel deep eutectic solution (DES) strategy effectively modifies magnesium anodes, preventing passivation and enabling stable cycling in magnesium metal batteries (MMBs). This breakthrough enhances interfacial kinetics and reduces overpotential for durable battery performance.
Area of Science:
- Materials Science
- Electrochemistry
- Energy Storage
Background:
- Magnesium metal batteries (MMBs) are hindered by Mg metal passivation and high overpotentials in traditional electrolytes.
- Developing stable and efficient interfaces is crucial for advancing MMB technology.
Purpose of the Study:
- To propose a cost-effective deep eutectic solution (DES) strategy for modifying Mg anodes.
- To enhance the stability and reversibility of Mg plating/stripping behavior in MMBs.
Main Methods:
- A MgCl2-Al-MgCl2 sandwich structure coating was applied to the Mg anode using a DES.
- An organic/nanocrystal hybrid interphase was formed via an in-situ Mg-Al displacement reaction.
- Electrochemical performance was evaluated in Mg(TFSI)2/DME electrolyte with CuS and phenanthraquinone cathodes.
Main Results:
- The DES modification resulted in a compact and stable interphase, minimizing passivation and diffusion barriers.
- Highly reversible Mg anode cycling was achieved, exceeding 5000 hours at 0.1 mA cm-2.
- Low overpotentials were maintained even at high current densities (0.23 V at 1 mA cm-2).
Conclusions:
- The DES-assisted strategy provides a robust and conductive solid electrolyte interphase for MMBs.
- This approach offers a new pathway for designing high-voltage and durable magnesium metal batteries.
- The method effectively addresses key challenges in magnesium metal anode performance.
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