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Surface Functionalization of Metal-Organic Frameworks for Improved Moisture Resistance

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Metal-Organic Framework for Aluminum based Energy Storage Devices: Utilizing Redox Additives for Significant

Puja De¹, Surbhi Priya², Joyanti Halder¹

¹Department of Physics, Indian Institute of Technology Kharagpur, Kharagpur 721302, India.

ACS Applied Materials & Interfaces

|May 11, 2024

Summary

Researchers developed a new approach for aluminum-ion batteries (AIBs) using a redox additive electrolyte and ZIF 67 framework. This method significantly enhances discharge capacity and cycling stability, improving AIB performance.

Keywords:

Aqueous electrolyte Diffusion Metal organic frameworks Rechargeable Al-ion battery Redox additive

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Area of Science:

Materials Science
Electrochemistry
Energy Storage

Background:

Sluggish kinetics in aluminum-ion batteries (AIBs) limit performance.
Current strategies like morphology tuning offer limited improvements.

Purpose of the Study:

To enhance the performance of AIBs by addressing kinetic limitations.
To introduce a novel approach using redox additives and advanced framework materials.

Main Methods:

Utilized ZIF 67, a porous framework material, to facilitate aluminum ion diffusion.
Incorporated potassium ferricyanide as a redox additive in an aqueous aluminum chloride electrolyte.
Assembled Al-ion based BatCap devices with ZIF 67 cathode and derived porous carbon anode.

Main Results:

Achieved a superior discharge capacity of 288 mAh g^-1 at 0.2 A g^-1 with robust cycling stability.
Demonstrated significant enhancement in specific capacity and cycling stability with redox additive modification.
The assembled BatCap device showed an energy density of 86 Wh kg^-1 at 2 KW kg^-1.

Conclusions:

The combination of redox additive modified electrolyte and ZIF 67 framework effectively overcomes kinetic limitations in AIBs.
The developed AIBs exhibit superior performance compared to previously reported aqueous systems.
Ex situ characterization elucidated the mechanism of redox additives in enhancing AIB performance.