Gang-In Lee, Deok-Hye Park, Ji-Hwan Kim, Jae-Sung Jang, So-Yeon Ahn, Young-Kwang Kim, Jong-Won Lim, Ji-Min Hong, Se-Jun Park, Min-Jae Kim, Se-Yeon Jang, Kyung-Won Park
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引用次数: 0
Abstract
Lithium–sulfur batteries (LSBs) have received attention as next-generation electrochemical power sources owing to their high theoretical capacities and energy densities. Despite these merits, LSBs face critical problems, such as the dissolution and shuttle effect of lithium polysulfides (LiPSs), during their operation. In this study, Fe-zeolitic imidazolate framework (Fe-ZIF)-derived carbon nanofibers (Fe/N-CNFs) were fabricated using electrospinning and in situ growth. In particular, for the doping with Fe and N, the increased electronic density of the doped structure at the Fermi level was confirmed through density of state calculations. Furthermore, according to density functional theory (DFT) calculations, the Fe/N-CNFs with FeNx active sites exhibited improved chemical affinity between Fe and S and enhanced adsorption properties for LiPSs, suppressing the dissolution of LiPSs and promoting fast conversion reactions and enhanced sulfur redox kinetics. The cell assembled with the electrospun Fe/N-CNFs as the cathode with sulfur showed a retention of 78% at a high rate of 2.0C. The enhanced electrochemical performance and stability of the LSB with Fe/N-CNFs can be attributed to the high electrical conductivity and excellent conversion reaction of the LiPSs on the FeNx active sites.
期刊介绍:
The Journal of Materials Chemistry A, B & C covers a wide range of high-quality studies in the field of materials chemistry, with each section focusing on specific applications of the materials studied. Journal of Materials Chemistry A emphasizes applications in energy and sustainability, including topics such as artificial photosynthesis, batteries, and fuel cells. Journal of Materials Chemistry B focuses on applications in biology and medicine, while Journal of Materials Chemistry C covers applications in optical, magnetic, and electronic devices. Example topic areas within the scope of Journal of Materials Chemistry A include catalysis, green/sustainable materials, sensors, and water treatment, among others.