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Promoting polysulfide conversion by catalytic ternary Fe3O4/carbon/graphene composites with ordered microchannels for ultrahigh-rate lithium-sulfur batteries

Abstract

As a promising energy storage system, the sluggish reaction kinetics and shuttle effect caused by the dissolution of lithium polysulfide limit the practical application for Lithium-sulfur (Li-S) batteries and their substantial commercialization. Herein, a significant improvement of conversion kinetics and areal sulfur loading is achieved by an ordered microchannel graphene scaffold with incorporated catalytic Fe3O4 nanocrystals and porous carbon as a multifunctional sulfur host. The synergy between the polar catalytic Fe3O4 nanocrystals and porous carbon frameworks enables a strong polysulfides anchoring effect and a fast polysulfides conversion rate. Thus, the 3D ternary Fe3O4/porous carbon/graphene aerogel demonstrates ultrahigh rate performance of 755 mAh g-1 at 3 C and a high areal capacity of 6.24 mAh cm-2 at a sulfur loading of 7.7 mg cm-2. Moreover, the promoted reaction kinetics and reliable cycliability are revealed by visible evolution of polysulfides detected using in situ X-ray diffraction (XRD), and the enhanced chemical anchoring of polysulfides is disclosed by density functional theory (DFT) calculation, which are vital to the superb lithium sulfur batteries. This work provides a promising approach to develop multifunctional 3D interconnected porous aerogel with metal oxide nanocrystals for high-performance Li-S batteries, especially those suffer from low sulfur loading and inferior rate performance.

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Publication details

The article was received on 17 Jun 2019, accepted on 09 Sep 2019 and first published on 27 Sep 2019


Article type: Paper
DOI: 10.1039/C9TA06489C
J. Mater. Chem. A, 2019, Accepted Manuscript

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    Promoting polysulfide conversion by catalytic ternary Fe3O4/carbon/graphene composites with ordered microchannels for ultrahigh-rate lithium-sulfur batteries

    M. Ding, S. Huang, Y. Wang, J. Hu, M. E. Pam, S. fan, Y. shi, Q. Ge and H. Y. Yang, J. Mater. Chem. A, 2019, Accepted Manuscript , DOI: 10.1039/C9TA06489C

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