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Ti3C2T nanosheet@Cu/Fe-MOF separators for high-performance lithium-sulfur batteries: an experimental and density
Maryam Sadat Kiai1, Srikanth Ponnada2,3, Omer Eroglu4
1Center for BioNano Interactions, School of Chemistry, University College of Dublin, Belfield, Dublin 4, Ireland. maryam.kiai@ucd.ie.
Dalton Transactions (Cambridge, England : 2003)
|December 1, 2023
Summary
Novel coatings on glass fiber separators using MXene and metal-organic frameworks (MOFs) significantly improve lithium-sulfur (Li-S) battery performance by trapping polysulfides and preventing dendrite growth, enhancing capacity and stability.
Area of Science:
- Materials Science
- Electrochemistry
- Energy Storage
Background:
- Lithium-sulfur (Li-S) batteries offer high theoretical energy density but suffer from capacity fading due to the polysulfide shuttle effect and lithium dendrite formation.
- Existing separators limit the practical application of Li-S batteries.
Purpose of the Study:
- To develop novel separator coatings for high-performance Li-S batteries.
- To address capacity fading and dendrite issues in Li-S battery technology.
Main Methods:
- Coating glass fiber separators with Ti3C2Tx (MXene) nanosheets combined with either Fe-MOF or Cu-MOF.
- Characterizing the electrochemical performance of the modified separators in Li-S cells.
- Performing ab initio calculations to understand the mechanism of polysulfide dissociation.
Main Results:
- MXene/MOF coated separators effectively trapped polysulfides and mitigated Li dendrite growth.
- Cells with Cu-MOF/MXene and Fe-MOF/MXene separators showed superior capacities of 1100 and 1131 mA h g-1 after 300 cycles, respectively.
- Significant improvements in discharge capacity, coulombic efficiency, and cycling stability were observed compared to bare glass fiber separators.
Conclusions:
- The developed MXene/MOF coatings are highly effective in enhancing Li-S battery performance.
- The combination of MXene's conductivity and MOF's sieving properties provides a synergistic effect for polysulfide confinement and dendrite suppression.
- Ab initio calculations confirmed the role of MXene in dissociating lithium polysulfides, validating the experimental observations.
