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- Title
MOF-derived Fe<sub>7</sub>S<sub>8</sub>–Fe<sub>2</sub>O<sub>3</sub> heterojunction as separator coating for efficient catalysis of lithium polysulfide in Li-sulfur battery.
- Authors
Wang, Jun; Zhang, Jian-Hui; Zhao, Wen-Hua; Hou, Yong; Xu, Run-Kai; Lin, Zhi-Rui; Zhong, Xiao-Na; Pan, Xue-Xue
- Abstract
In this paper, the Fe7S8–Fe2O3/NCF composite is vulcanized with Fe-BTT/NCF composite as the precursor and used as an overlay material of the separator for Li-sulfur batteries. Fe2O3 can rapidly capture lithium polysulfides, and Fe7S8 can effectively catalyze polysulfide lithium. Homogeneous Fe7S8–Fe2O3 heterostructures cooperate with each other to inhibit the shuttle effect of polysulfide lithium. In the condition of sulfur loading of 1.5 mg/cm2, the Li-sulfur battery assembled with Fe7S8–Fe2O3/NCF as the overlay separator has an initial capacity of 1054.5 mAh/g at 1C, and the ultimate specific capacity is kept at 651.0 mAh/g after 300 long-term cycles. It can maintain 564.0 mAh/g even at a tremendous current density of 5 C. At the same time, even in the case of an excessive sulfur mass of 4.7 mg/cm2, the reversible capacity density can still be maintained at 890.1 mAh/g for the following 50 cycles. An appropriate example of designing a functional separator from this work can inhibit shuttle effects efficiently.
- Subjects
LITHIUM sulfur batteries; HETEROJUNCTIONS; CATALYSIS; SURFACE coatings; POLYSULFIDES; HETEROSTRUCTURES
- Publication
Journal of Nanoparticle Research, 2024, Vol 26, Issue 2, p1
- ISSN
1388-0764
- Publication type
Article
- DOI
10.1007/s11051-024-05930-7