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Author Spotlight: Magnetometric Characterization of Intermediates in the Solid-State Electrochemistry of Redox-Active Metal-Organic Frameworks
Published on: June 9, 2023
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Functional metal-organic framework boosting lithium metal anode performance via chemical interactions
Wen Liu1, Yingying Mi1,2, Zhe Weng1
1Department of Chemistry and Energy Sciences Institute , Yale University , 810 West Campus Drive , West Haven , CT 06516 , USA .
Chemical Science
|June 20, 2017
Summary
This study introduces metal-organic frameworks (MOFs) to improve lithium metal batteries. Coating separators with NH2-MIL-125(Ti) MOF enables dendrite-free lithium deposition, enhancing battery stability and efficiency.
Area of Science:
- Materials Science
- Electrochemistry
- Battery Technology
Background:
- Lithium metal batteries offer high energy density but are limited by dendrite growth and low coulombic efficiency.
- Uniform lithium deposition is crucial for stable cycling and battery longevity.
Purpose of the Study:
- To investigate metal-organic framework (MOF) materials for enhancing lithium metal electrode performance.
- To demonstrate molecular-structure functionalization for improved ion transport and lithium deposition.
Main Methods:
- Modification of commercial polypropylene separators with a titanium-based MOF (NH2-MIL-125(Ti)).
- Electrochemical testing of Li|Cu and Li|Li symmetric cells with modified separators.
Main Results:
- Achieved dendrite-free dense lithium deposition.
- Demonstrated stable Li plating/stripping cycling with high coulombic efficiency (98.5% average over 200 cycles in Li|Cu cells).
- Li|Li symmetric cells cycled over 1200 hours without short-circuiting.
Conclusions:
- NH2-MIL-125(Ti) coated separators significantly improve lithium metal electrode stability.
- Amine substituents in NH2-MIL-125(Ti) promote uniform lithium nucleation and enhance Li+ transference numbers.
- MOF functionalization is a powerful strategy for next-generation high-energy-density batteries.
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