Liquid Metal Composites Enabled High-Safety Flexible Solid-State Aluminum Batteries

Area of Science:

• Materials Science
• Electrochemistry
• Energy Storage

Background:

• Rechargeable aluminum batteries (RABs) offer safe, low-cost stationary energy storage.
• Aluminum anode instability (dendrite growth, corrosion) limits RAB cycle life.

Purpose of the Study:

• To develop a stable aluminum anode for enhanced rechargeable aluminum battery performance.
• To address aluminum anode instability issues limiting cycle life.

Main Methods:

• Fabrication of a composite anode (Al20-LM-Ti) with aluminum microparticles semi-embedded in EGaIn.
• Structural analysis and electrochemical testing of the composite anode in symmetric and full cells.
• Mechanical and thermal stress testing to evaluate reliability.

Main Results:

• The Al20-LM-Ti anode demonstrated resistance to electrolyte corrosion and suppressed aluminum dendrite growth.
• Symmetric cells achieved stable cycling over 2200-3000 hours at high current densities (1-3 mA cm-2).
• A full cell (Al20-LM-Ti//graphite) operated stably for over 39,000 cycles at 1.5 A g-1.

Conclusions:

• The novel composite anode design significantly enhances the stability and cycle life of rechargeable aluminum batteries.
• The material exhibits exceptional reliability under extreme mechanical and thermal stress.
• This anode strategy holds promise for advancing high-performance aluminum batteries and other electrochemical systems.