Rechargeable Aqueous Aluminum Organic Batteries

Area of Science:

• Electrochemistry
• Materials Science
• Energy Storage

Background:

• Aqueous aluminum-ion batteries (AABs) are promising energy storage systems.
• Current inorganic cathodes face challenges like sluggish kinetics and poor stability due to strong Al³⁺ interactions.
• Limited lattice spacing and rigid structures hinder ion diffusion in conventional materials.

Purpose of the Study:

• To explore organic compounds as cathode materials for AABs.
• To investigate the potential of phenazine (PZ) as a high-performance cathode.
• To understand the mechanism of anion co-intercalation in organic cathodes for AABs.

Main Methods:

• Utilizing phenazine (PZ) as a redox-active organic cathode material in AABs.
• Investigating the Al-complex co-intercalation mechanism facilitated by the flexible organic structure.
• Analyzing the electrochemical performance, including capacity and cyclability.

Main Results:

• Phenazine enables large-size Al-complex co-intercalation, reducing desolvation penalty and Coulombic repulsion.
• The organic cathode exhibits high capacity and excellent cyclability, surpassing most reported AAB cathode materials.
• Demonstrated the viability of anion co-intercalation chemistry in redox-active organic materials.

Conclusions:

• Organic materials, specifically phenazine, offer a promising alternative to inorganic cathodes in AABs.
• Anion co-intercalation is an effective strategy to enhance electrochemical performance in AABs.
• This research paves the way for developing advanced multivalent-ion battery systems.