Facile Fabrication of Core-Shell Structure Fe3O4@C Nanodots for Enhanced Lithium-Sulfur Batteries

doi:10.1007/s40195-020-01104-1

Abstract

Abstract:

Lithium sulfur battery (LSB) is widely considered as a next-generation battery system due to its high theoretical energy density of 2567 Wh kg^-1. However, several inherent issues obstruct the business application of LSB. To address these issues, we assemble core-shell structure Fe₃O₄@C nanodots with 5 nm diameter as a valid sulfur host via a convenient organic pyrolysis treatment followed by calcination. The nanosized Fe₃O₄ particles could expose more chemisorption sites and inhibit the polysulfides shuttle. Moreover, the carbon layer could not only increase the conductivity but also ensure structural integrity during cyclic process. Furthermore, the mesoporous channels around Fe₃O₄@C could supply sufficient space to load sulfur and physically restrict the shuttle of polysulfides. Thus, the resultant S/Fe₃O₄@C cathode shows a highly initial capacity of 1089 mAh g^-1 at 0.2 C, even retains 655 mAh g^-1 over 200 cycles at 1 C.

Key words: Fe₃O₄, Nanodots, Cathode, Lithium-sulfur batteries

Xiang-Rui He, Yu-Jiao Zhang, Li-Fan Yang, Ji-Lu Zhao, Hong-Tai Li, Yi-Bo Gao, Bao Wang, Xiao-Dong Guo. Facile Fabrication of Core-Shell Structure Fe₃O₄@C Nanodots for Enhanced Lithium-Sulfur Batteries[J]. Acta Metallurgica Sinica (English Letters), 2021, 34(3): 410-416.

Figures/Tables 6

Fig. 1 Schematic illustration of the structure of Fe3O4@C host and S/Fe3O4@C composite cathode

Fig. 2 a SEM image of Fe3O4@C, b TEM image of Fe3O4@C, c SEM image of S/Fe3O4@C and corresponding Fe, O, C, S element mappings

Fig. 3 a XRD patterns of S/Fe3O4@C, sulfur and Fe3O4@C, b N2 adsorption/desorption isotherms, c pore size distribution pattern of Fe3O4@C, d TGA curve of Fe3O4@C in air, e TGA curve of S/Fe3O4@C in Ar atmosphere, f Raman spectrum of Fe3O4@C

Fig. 4 XPS spectra of Fe3O4@C composite: a survey, b Fe 2p, c O 1 s, d C 1 s

Fig. 5 a CV curves of S/Fe3O4@C cathode at 0.1 mV s-1 in the potential window from 1.7 to 2.8 V, b galvanostatic charge-discharge curves of the S/Fe3O4@C electrode at different cycles, c rate capability of S/Fe3O4@C and S/C cathodes from 0.1 C to 2 C, d galvanostatic charge-discharge curves of the S/Fe3O4@C electrode under varied currents from 0.1 C to 2 C

Fig. 6 a Cycle performance of S/Fe3O4@C and S/C cathodes at 0.2 C, b cycle performance of S/Fe3O4@C and S/C cathodes at 1 C

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Facile Fabrication of Core-Shell Structure Fe₃O₄@C Nanodots for Enhanced Lithium-Sulfur Batteries

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