Novel Cu(II)-based metal–organic framework STAM-1 as a sulfur host for Li–S batteries

• Published in: Scientific reports 2024-04, Vol.14 (1), p.9232-9232, Article 9232
• Main Authors: Niščáková, V., Almáši, M., Capková, D., Kazda, T., Čech, O., Čudek, P., Petruš, O., Volavka, D., Oriňaková, R., Fedorková, A. S.
• Format: Article
• Language: English
• Subjects: 639/301/299; 639/4077/4079/891; 639/638/440; 639/638/675; Ambient temperature; Carbon dioxide; Cathode materials; Cathodes; Composite materials; Copper; Crystals; Electrons; Energy storage; Humanities and Social Sciences; Infrared spectroscopy; Lithium; Lithium–sulfur battery; Metal–organic framework; multidisciplinary; Photoelectron spectroscopy; Science; Science (multidisciplinary); Spectrum analysis; Sulfur
• ISSN: 2045-2322; 2045-2322
• DOI: 10.1038/s41598-024-59600-8

Due to the increasing demand for energy storage devices, the development of high-energy density batteries is very necessary. Lithium–sulfur (Li–S) batteries have gained wide interest due to their particularly high-energy density. However, even this type of battery still needs to be improved. Novel Cu(II)-based metal–organic framework STAM-1 was synthesized and applied as a composite cathode material as a sulfur host in the lithium–sulfur battery with the aim of regulating the redox kinetics of sulfur cathodes. Prepared STAM-1 was characterized by infrared spectroscopy at ambient temperature and after in-situ heating, elemental analysis, X-ray photoelectron spectroscopy and textural properties by nitrogen and carbon dioxide adsorption at − 196 and 0 °C, respectively. Results of the SEM showed that crystals of STAM-1 created a flake-like structure, the surface was uniform and porous enough for electrolyte and sulfur infiltration. Subsequently, STAM-1 was used as a sulfur carrier in the cathode construction of a Li–S battery. The charge/discharge measurements of the novel S/STAM-1/Super P/PVDF cathode demonstrated the initial discharge capacity of 452 mAh g −1 at 0.5 C and after 100 cycles of 430 mAh g −1 , with Coulombic efficiency of 97% during the whole cycling procedure at 0.5 C. It was confirmed that novel Cu-based STAM-1 flakes could accelerate the conversion of sulfur species in the cathode material.