Toward High-Performance Metal-Organic-Framework-Based Quasi-Solid-State Electrolytes: Tunable Structures and...

Area of Science:

• Materials Science
• Electrochemistry
• Nanotechnology

Background:

• Metal-organic frameworks (MOFs) show promise for electrochemical applications due to their tunable structures.
• Designing MOF-based electrolytes for high-energy lithium batteries remains a challenge.

Purpose of the Study:

• To systematically investigate the effects of MOF pore apertures and open metal sites on ion transport and electrochemical stability.
• To develop advanced quasi-solid-state electrolytes for high-energy lithium batteries.

Main Methods:

• Design and synthesis of nanocrystalline MOFs.
• Advanced characterization techniques.
• Ab initio molecular dynamics simulations.

Main Results:

• MOFs with non-redox-active metal centers exhibit wider electrochemical stability windows.
• Pore aperture is critical for lithium salt uptake and ionic conductivity.
• Open metal sites facilitate salt dissociation, improve Li-ion mobility, and increase transference number.

Conclusions:

• Rational design of MOFs can lead to superior quasi-solid-state electrolytes.
• Structure-property relationships in MOFs are key for developing advanced lithium battery electrolytes.
• Demonstrated excellent battery performance with commercial cathodes.