Interfacial electric field effect enhances magnesium anode dynamics and stability

Achieving high-performance anodes relies on the coupled effects of interfacial electric fields and controllable deposition morphology. Previous strategies, such as interface modification, structural design, or electrolyte additive incorporation, have improved interface stability to some extent. However, these approaches have primarily focused on constructing physical barrier layers, failing to deeply regulate the electric field at the electrode-electrolyte interface.

In this study, a metal phthalocyanine compound, copper phthalocyanine (CuPc), is employed as an artificial interlayer to modify the magnesium metal surface (CuPc@Mg). Leveraging its unique conjugated 18π-electron system and the synergistic effect of the Cu–N₄ active centers, a highly delocalized electron cloud network is constructed. This effectively modulates the interfacial electric field distribution, significantly reduces the charge transfer barrier, and promotes uniform transport and deposition of magnesium ions. This work provides a new direction for the practical implementation of magnesium metal anodes and offers important insights into interface design for other metal-based batteries.

The work titled “Interfacial electric field effects enhance the kinetics and stability of magnesium metal anodes for rechargeable magnesium batteries”, was published in Advanced Powder Materials (Available online on 21 August 2025).