Fast-charging aluminium-chalcogen batteries resistant to dendritic shorting

Area of Science:

• Electrochemistry
• Materials Science
• Energy Storage

Background:

• Metal-based batteries offer high energy density but face challenges with dendrite formation and recyclability.
• Existing aluminum battery technologies are hindered by low capacity compounds and high polarization in room-temperature ionic liquids.

Purpose of the Study:

• To develop a rapidly charging, high-performance aluminum-chalcogen battery.
• To overcome the limitations of dendrite formation and low charge rates in metal-based batteries.

Main Methods:

• Utilized a molten-salt electrolyte (NaCl-KCl-AlCl3) with high AlCl3 content for facile Al3+ desolvation.
• Employed elemental chalcogen as the positive electrode material.
• Investigated the multi-step conversion pathway between aluminum and chalcogen for rapid charging.

Main Results:

• Demonstrated a bidirectional, rapidly charging aluminum-chalcogen battery capable of charging at up to 200C.
• Achieved hundreds of cycles at high charging rates without aluminum dendrite formation.
• Projected cell-level cost to be less than one-sixth of current lithium-ion technologies.

Conclusions:

• The developed aluminum-chalcogen battery chemistry is a promising low-cost, rechargeable, fire-resistant, and recyclable energy storage solution.
• Earth-abundant materials and operation at moderately elevated temperatures enhance its scalability and sustainability.
• This technology addresses key limitations of current battery systems, paving the way for safer and more economical energy storage.