Carbon Nanotube Supported Fluorine Substituted Iron Phthalocyanine Enabling Boosted Polysulfide Redox Conversion Kinetics and Cyclic Stability
Zhao, Jiaqi (Shaanxi University of Science and Technology)
Xu, Zhanwei (Shaanxi University of Science and Technology)
Zhang, Yujiao (Ramu NiCo Management (MCC) Limited)
Jin, Qingzhu (Shaanxi University of Science and Technology)
Guo, Longhua (Shaanxi University of Science and Technology)
Chen, Siyu (Institut Català de Nanociència i Nanotecnologia)
Shen, Xuetao (Shaanxi University of Science and Technology)
Li, Jiayin (Shaanxi University of Science and Technology)
Li, Zhi (National Institute for Nanotechnology (Canada))

Data:	2025
Resum:	The sluggish transition and shuttle of polysulfides (LiPS) significantly hinder the application and commercialization of Li−S batteries. Herein, carbon nanotubes (CNTs) supported 10 nm sized iron Hexadecafluorophthalocyanine (FePcF/CNTs) are prepared using a solid synthesis approach. The well-exposed FePcF molecular improve the LiPS capture efficiency and redox kinetics by its central Fe−N units and F functional groups. The strong electron withdraw F groups significantly promote the conjugate effect and decrease the steric hindrance during mass migration procedure. Distribution of relaxation time (DRT) analysis shows that the Fe−N units exhibit strong affinity towards LiPS and the F groups further improve the Li diffusion rate in LiS nucleation and oxidation procedure, accomplishing a porous surface on cathode. As a result, the FePcF/CNTs separator exhibits a high initial capacity of 1136. 2 mAh g at 0. 2 C, outstanding rate capacity of 624. 9 mAh g at 5 C and superior long-term stability at 2 C surviving 300 cycles with a low capacity decay of 0. 43 ‰ per cycle.
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Llengua:	Anglès
Document:	Article ; recerca ; Versió acceptada per publicar
Matèria:	F substituent group ; Iron phthalocyanine ; Polysulfide ; Shuttle effect ; Lithium sulfur batteries
Publicat a:	ChemSusChem, Vol. 18, Issue 2 (January 2025) , art. e202400451, ISSN 1864-564X

DOI: 10.1002/cssc.202400451

Disponible a partir de: 2026-01-31 Postprint

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