Metallophilic Non-van der Waals Roll-ups Engineered for Long-Life Metal Batteries

Area of Science:

• Materials Science
• Electrochemistry
• Nanotechnology

Background:

• Metal hybrid electrodes offer high theoretical capacities for advanced batteries.
• High surface tension between molten metals and composites limits practical applications.

Purpose of the Study:

• To engineer novel materials addressing the incompatibility of molten metals with composite battery components.
• To enhance the performance and stability of metal-based battery electrodes.

Main Methods:

• Synthesis of unique metallophilic non-van der Waals (non-vdW) roll-ups from scrolled transition metal carbides (MXenes).
• Characterization of the roll-ups' structure, thermal stability, and interaction with molten metals (Li, Ga, Mg).
• Fabrication and testing of metal hybrid foils and magnesium battery anodes.

Main Results:

• Achieved stable, nano-sized hollow roll-ups with abundant dangling bonds and thermal stability up to 800 °C.
• Demonstrated strong chemical bonding and capillary forces between roll-ups and molten metals, creating metallophilic properties.
• Reduced surface tension in metal composites, enabling thin, high-strength foils (e.g., Mg foil with 204 MPa tensile strength).
• Developed magnesium battery anodes exhibiting 90.0% capacity retention after 500 cycles.

Conclusions:

• The novel non-vdW roll-ups overcome molten metal incompatibility issues in battery electrodes.
• These materials facilitate the creation of robust, high-performance metal hybrid electrodes for advanced energy storage.
• The developed magnesium battery anode shows significant potential for long-term cycling stability.