Dynamic Alloying Codeposition/Costripping for Dendrite-Less Multivalent Metal Batteries.

Area of Science:

• Materials Science
• Electrochemistry
• Energy Storage

Background:

• Multivalent metal batteries offer sustainable, low-cost energy storage solutions.
• Aluminum metal batteries face challenges with dendritic growth at practical operating conditions.

Purpose of the Study:

• To develop a strategy for suppressing aluminum dendrites in aluminum metal batteries.
• To enable stable and high-performance aluminum anodes for large-scale energy storage.

Main Methods:

• An electrochemically driven dynamic alloying codeposition/costripping strategy was employed.
• The strategy utilizes Al-Mn-Cl-active clusters in a chloroaluminate electrolyte.
• This facilitates dynamic Al-Mn codeposition and reversible costripping.

Main Results:

• A smooth, dendrite-free aluminum anode was achieved under practical conditions.
• The aluminum anode demonstrated over 1000 hours of cycling stability at 10 mA cm^-2 and 20 mA h cm^-2.
• Aluminum|graphite cells reached a 4000-cycle lifespan at 24.6 mA cm^-2.

Conclusions:

• The dynamic alloying strategy effectively suppresses aluminum dendrites.
• This approach paves the way for stable, high-rate, dendrite-less multivalent metal anodes.
• The findings are crucial for advancing next-generation large-scale energy storage systems.