Biomimetic Dendrite-Free Multivalent Metal Batteries.

Area of Science:

• Materials Science
• Electrochemistry
• Energy Storage

Background:

• Rechargeable multivalent metal batteries (e.g., zinc and aluminum) offer low cost and safety for energy storage.
• Poor anode-electrolyte compatibility hinders the practical application of these batteries.
• Developing stable and efficient multivalent metal anodes is crucial for advancing energy storage technologies.

Purpose of the Study:

• To design and demonstrate a biomimetic scaffold for efficient multivalent metal plating and stripping.
• To improve the compatibility between metallic anodes (Zn and Al) and electrolytes.
• To enhance the performance and lifespan of rechargeable Zn and Al batteries.

Main Methods:

• Fabrication of a biomimetic scaffold using a parallel-aligned array of fractal copper branches coated with CaTiO3 (CTO).
• Electrochemical testing of Zn and Al anodes within the developed scaffold.
• Utilizing theoretical modeling and experimental investigations to understand the scaffold's mechanism.

Main Results:

• The biomimetic scaffold enabled dendrite-free Zn and Al metal anodes with high reversibility and long cycle life.
• The scaffold demonstrated excellent performance in Zn and Al full batteries.
• Fractal copper arrays facilitated ion diffusion and reduced current densities, while the CTO coating prevented side reactions and ensured uniform ion flux.

Conclusions:

• Confining multivalent metals in the designed biomimetic scaffold significantly improves plating/stripping efficiency.
• The synergistic effect of the fractal copper array and CTO coating addresses key challenges in multivalent metal batteries.
• This work presents a promising strategy for developing next-generation, high-performance multivalent metal batteries for large-scale energy storage.