Large-Scale Integration of the Ion-Reinforced Phytic Acid Layer Stabilizing Magnesium Metal Anode

Area of Science:

• Materials Science
• Electrochemistry
• Energy Storage

Background:

• Rechargeable magnesium batteries (RMBs) are promising for large-scale energy storage.
• Commercialization is hindered by the failure of large Mg metal anodes during fast cycling.
• Need for stable, high-performance Mg anodes is critical for RMB development.

Purpose of the Study:

• To develop a large-scale, stable protective layer for Mg metal anodes.
• To enable uniform Mg plating/stripping and enhance electrochemical performance.
• To demonstrate the practical viability of protected Mg anodes in RMBs.

Main Methods:

• Fabrication of a large-scale ion-reinforced phytic acid (PA) layer with water-oxygen tolerance.
• Preparation of a large-sized PA-Al@Mg electrode.
• Electrochemical testing of symmetric cells, full cells (PA-Al@Mg//Mo6S8), and pouch cells.

Main Results:

• The PA-Al@Mg electrode showed uniform Mg plating/stripping without perforation.
• Symmetric cells achieved ultralong lifespan (2400 h) and high current tolerance (300 h).
• Full cells demonstrated exceptional stability (8000 cycles, 99.8% retention), and pouch cells showed stable operation.

Conclusions:

• The ion-reinforced phytic acid layer effectively stabilizes large Mg metal anodes.
• This approach significantly enhances the cycling life and stability of RMBs.
• The findings provide crucial insights for the practical application of RMBs in energy storage.