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Perfluoroaryl-elemental sulfur SNAr chemistry in covalent triazine frameworks with high sulfur contents for lithium-sulfur batteries

Cited 68 time in Web of Science Cited 67 time in Scopus
Authors
Je, Sang Hyun; Kim, Hyeon Jin; Kim, Jiheon; Choi, Jang Wook; Coskun, Ali
Issue Date
2017-12
Citation
Advanced Functional Materials, Vol.27 No.47, p. 1703947
Keywords
elemental sulfurlithium-sulfur batterynucleophilic aromatic substitutionporous organic polymertrimerization
Abstract
In order to address the challenges associated with lithium-sulfur batteries with high energy densities, various approaches, including advanced designs of sulfur composites, electrolyte engineering, and functional separators, are lately introduced. However, most approaches are effective for sulfur cathodes with limited sulfur contents, i.e., < 80 wt%, imposing a significant barrier in realizing high energy densities in practical cell settings. Here, elemental sulfur-mediated synthesis of a perfluorinated covalent triazine framework (CTF) and its simultaneous chemical impregnation with elemental sulfur via SNAr chemistry are demonstrated. SNAr chemistry facilitates the dehalogenation and nucleophilic addition reactions of perfluoroaryl units with nucleophilic sulfur chains, achieving a high sulfur content of 86 wt% in the resulting CTF. The given sulfur-impregnated CTF, named SF-CTF, exhibits a specific capacity of 1138.2 mAh g(-1) at 0.05C, initial Coulombic efficiency of 93.1%, and capacity retention of 81.6% after 300 cycles, by utilizing homogeneously distributed sulfur within the micropores and nitrogen atoms of triazine units offering high binding affinity toward lithium polysulfides.
ISSN
1616-301X
URI
https://hdl.handle.net/10371/164665
DOI
https://doi.org/10.1002/adfm.201703947
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College of Engineering/Engineering Practice School (공과대학/대학원)Dept. of Chemical and Biological Engineering (화학생물공학부)Journal Papers (저널논문_화학생물공학부)
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