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Issue 32, 2019
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Hierarchical porous Fe/N doped carbon nanofibers as host materials for high sulfur loading Li–S batteries

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Abstract

Improving the sulfur utilization and cycling stability especially under high sulfur loading (>2 mg cm−2) is challenging due to the poor conductivity of sulfur and high soluble nature of polysulfides. Herein, we develop novel self-supporting carbon nanofibers with hierarchical porous structures and Fe/N absorption/nucleation centers (Fe/N-HPCNF) as high performance sulfur hosts via a facile co-spinning method. The highly interior porous carbon fiber structure provides good electrolyte infiltration, stable conductive networks and sufficient surfaces for fast Li+/electron transport and sulfur redox while maintaining high sulfur area loading. In addition, the abundant Fe/N heteroatoms evenly dispersed in the fiber strongly restrain polysulfide diffusion through a chemisorption effect and meanwhile regulate homogeneous sulfur nucleation, enhancing the stability of cathodes. Consequently, S@Fe/N-HPCNF cathodes realize a high initial specific capacity of 1273 mA h g−1 (areal capacity: 4.5 mA h cm−2) and long cycle life over 500 cycles with a high sulfur loading of 3.5 mg cm−2. A stable capacity of 6.6 mA h cm−2 is achieved even under 9 mg cm−2 sulfur. What's more, a pouch cell prototype with an ultrahigh sulfur area density (54 mg cm−2) was assembled and successfully lighted 10 yellow light-emitting diodes (LED), demonstrating the convenient scale-up of our S@Fe/N-HPCNF cathodes.

Graphical abstract: Hierarchical porous Fe/N doped carbon nanofibers as host materials for high sulfur loading Li–S batteries

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Supplementary files

Article information


Submitted
23 May 2019
Accepted
19 Jul 2019
First published
22 Jul 2019

Nanoscale, 2019,11, 15156-15165
Article type
Paper

Hierarchical porous Fe/N doped carbon nanofibers as host materials for high sulfur loading Li–S batteries

M. Jiang, R. Wang, K. Wang, S. Gao, J. Han, J. Yan, S. Cheng and K. Jiang, Nanoscale, 2019, 11, 15156
DOI: 10.1039/C9NR04408F

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