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Sodium Ion Conductivity in Superionic IL-Impregnated Metal-Organic Frameworks: Enhancing Stability Through Structural
Vahid Nozari1, Courtney Calahoo1, Joshua M Tuffnell2,3
1Otto Schott Institute of Materials Research, University of Jena, Jena, Germany.
Scientific Reports
|February 28, 2020
Summary
This study enhances sodium ion conductivity in metal-organic frameworks (MOFs) using ionic liquids. Partially amorphized ZIF-8 MOFs show high conductivity and improved stability for advanced electrolytes.
Area of Science:
- Materials Science
- Electrochemistry
- Solid-State Chemistry
Background:
- Metal-organic frameworks (MOFs) offer tunable host-guest interactions for composite electrolytes.
- Developing high-performance electrolytes is crucial for sodium-ion battery technology.
Purpose of the Study:
- To achieve high sodium ion conductivity in MOF-based composite electrolytes.
- To improve the stability of MOF/ionic liquid composites under ambient conditions.
Main Methods:
- Impregnation of zeolitic imidazolate framework ZIF-8 with a sodium-salt-containing ionic liquid (IL).
- Partial amorphization of the ZIF-8 backbone via ball-milling.
- Characterization of ionic conductivity and composite stability.
Main Results:
- Achieved ionic conductivity exceeding 2 × 10⁻⁴ S·cm⁻¹ at room temperature.
- Demonstrated low activation energy (0.26 eV) for Na⁺ conduction.
- Enhanced composite stability up to 20 days under ambient conditions through partial amorphization.
- Maintained superionic behavior despite decreased crystallinity.
Conclusions:
- The developed MOF/IL composite exhibits the highest reported Na⁺ ion conduction performance for MOF-based electrolytes at room temperature.
- Partial amorphization enhances composite stability by reducing IL exudation and contaminant interaction.
- Interconnected 3D pore networks are critical for efficient ion conduction in MOF/IL blends, more so than pore symmetry.
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