Real-Time Observation of Anion Reaction in High Performance Al Ion Batteries

Area of Science:

• Materials Science
• Electrochemistry
• Energy Storage

Background:

• Aluminum ion batteries (AIBs) are gaining attention due to high capacities and abundant resources.
• Carbon materials are promising cathodes for AIBs, but further development is needed.

Purpose of the Study:

• To synthesize flexuous graphite (FG) for AIBs.
• To investigate the AlCl4- intercalation mechanism in FG.
• To understand the electrochemical behavior of FG as an AIB cathode.

Main Methods:

• Synthesis of flexuous graphite (FG) via thermal shock treatment.
• In-situ scanning electron microscope (SEM) for real-time intercalation observation.
• In-situ X-ray diffraction (XRD) and Raman spectroscopy to analyze electrochemical behavior.

Main Results:

• FG demonstrates a unique integrated intercalation-adsorption mechanism.
• Intercalation occurs above 1.5 V, while adsorption occurs below 1.5 V.
• Achieved high capacity (≥140 mAh/g), long-term stability (>8000 cycles), and excellent rate performance (93 mAh/g at 7.5 A/g).

Conclusions:

• FG is a highly flexible and effective cathode material for AIBs.
• The integrated intercalation-adsorption mechanism is key to FG's superior performance.
• FG offers a promising pathway for developing high-performance, stable aluminum ion batteries.