MOF-74(M) (M = Mg(II), Fe(II), Ni(II)) frameworks to enable accelerated redox kinetics for Li–S batteries
Year: 2025
Type: article
Abstract: This study presents the development of a composite electrode material for lithium–sulphur (Li–S) batteries, combining MOF-74 with carbon black and sulphur. The MOF-74 structures, incorporating Ni(II), Mg(II), and Fe(II) metal ions, were synthesized via a solvothermal method and used to encapsulate sulphur. The microporous nature of MOF-74 facilitates the physical confinement and storage of sulphur, potentially enhancing the performance of Li–S batteries. The investigation focuses on how different central metal ions in MOF-74 influence the performance of sulphur-based electrodes. Among the metal ions studied, Fe(II) and Mg(II) were selected for their low toxicity, cost-effectiveness, and availability, while Ni(II) was included for its high catalytic properties. The materials were thoroughly characterized using infrared spectroscopy, thermogravimetric analysis, scanning electron microscopy, powder X-ray diffraction, elemental analysis and X-ray photoelectron spectroscopy. The thermal stability and textural properties of the materials were assessed, showing that MOF-74(Mg) exhibited the highest stability, followed by MOF-74(Ni) and MOF-74(Fe). Nitrogen adsorption/desorption measurements indicated that the specific surface area and pore volume varied with activation temperature, impacting the material’s performance. Among the tested materials, MOF-74(Ni) exhibited the strongest interaction with sulfur, as confirmed by XPS analysis. Electrochemical tests revealed that the S/MOF-74(Ni) electrode demonstrated superior stability and capacity retention with a minimal capacity fading rate of 0.001% per cycle over 200 cycles, achieving a reversible capacity of 465 mAh g −1 and a capacity retention of 99.75%. In contrast, the S/MOF-74(Fe) electrode showed significantly reduced performance. A structure–performance correlation was established to assess sulfur interaction, electrode stability, and degradation behavior. Overall, the results highlight that MOF-74(Ni) offers the most promising performance due to its effective sulphur immobilization and superior electrochemical properties compared to MOF-74(Mg) and MOF-74(Fe).
Source: Scientific Reports
Institutions: University of Limerick, Brno University of Technology, University of Pavol Jozef Šafárik, Jagiellonian University, Slovak Academy of Sciences, Institute of Experimental Physics of the Slovak Academy of Sciences, Centre National de la Recherche Scientifique, Aix-Marseille Université, Matériaux Divisés, Interfaces, Réactivité, Electrochimie
Language: English
Subfield: Electrical and Electronic Engineering
Field: Engineering
Domain: Physical Sciences
Open Access status: gold
Estimated APC paid: $2,690
Awards: Multinary Compound Si, Ge and Sn Derived Nanocrystals: Composition, Shape and Heterostructure Control via Solution Methods (NanoIVCrystals), G2418828327, Research infrastructure CzechNanoLab, Monolitické, hierarchicky porézne MOF-uhlíkové kompozity pre environmentálne aplikácie, NEILLSBAT - Nanostructured Electrodes and Ionic Liquid Electrolytes for Ultra High Energy Density Lithium Sulfur Batteries, G4782150172, Carbon-Based Materials Development for Sulfur Cathodes and High-Capacity Lithiated Silicon Anodes in LiSi-S Batteries, G5098725405, G5172154266, Confirm Centre for Smart Manufacturing, G6358972985, MAREI_Phase 2, AMBER_Phase 2, G7709587500
OpenAlex ID: W4415787540