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From Molecules to Materials: Engineering New Ionic Liquid Crystals Through Halogen Bonding
Published on: March 24, 2018
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MOF-supported crystalline ionic liquid: new type of solid electrolyte for enhanced and high ionic conductivity
Li Feng1, Guo-Qiang Li1, Yu-Kun Li1
1Beijing Key Laboratory for Optical Materials and Photonic Devices, Department of Chemistry, Capital Normal University, Beijing 100048, China. wancq@cnu.edu.cn.
Dalton Transactions (Cambridge, England : 2003)
|March 31, 2022
Summary
A novel solid sodium electrolyte combines an ionic liquid with a metal-organic framework (MOF) for high-performance all-solid-state batteries. This composite exhibits enhanced ion conductivity and stability, offering a new strategy for advanced energy storage solutions.
Area of Science:
- Materials Science
- Electrochemistry
- Nanotechnology
Background:
- High-performance all-solid-state batteries require advanced solid-state electrolytes (SSEs).
- Ionic liquids and metal-organic frameworks (MOFs) offer potential for improved SSE properties.
Purpose of the Study:
- To develop a novel solid sodium electrolyte by integrating an ionic liquid with a functionalized MOF.
- To investigate the ion conduction properties and stability of the resulting composite material.
Main Methods:
- Synthesis of a functionalized MOF (UiO-67-MIMS) and an ionic liquid (EIMS-NaTFSI).
- Formation of a solid composite (EN-1@UiO-67-MIMS) by incorporating the ionic liquid into the MOF channels.
- Characterization of ion conductivity and stability at elevated temperatures.
Main Results:
- The composite electrolyte achieved a high ionic conductivity of 1.02 × 10⁻² S cm⁻¹ at 150 °C, maintained over 30 days.
- Conductivity was 1-2 orders of magnitude higher than the bulk ionic liquid, despite lower ion content.
- The MOF matrix facilitated fast ion transport through ordered pathways.
Conclusions:
- The MOF-based crystalline ionic liquid strategy enables superior ion conduction and stability.
- This approach presents a promising new direction for developing high-performance solid-state electrolytes for sodium-ion batteries.
- The ordered structure within the MOF channels is key to enhanced ionic transport.
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