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Engineering Multi-Chambered Carbon Nanospheres@Carbon as Efficient Sulfur Hosts for Lithium-Sulfur Batteries

Abstract

Despite the advantages of high theoretical capacity and energy density, lithium-sulfur (Li-S) batteries still suffered from poor electrochemical performance resulted from the accelerated shuttle effect of polysulfides and the intrinsically low electroactivity of elemental sulfur. Herein, we report an updated core-shell sulfur host material based on the core-shell carbon encapsulated multi-chambered carbon nanospheres (MCCN@C) for Li-S batteries. The hierarchical and micro-mesoporous core in MCCN@C can allow the high sulfur loading (83.1 wt.%) and serve as the physical barriers to block the polysulfide dissolution, and the carbon shell can provide additional physical confinements for improving the retention of soluble polysulfides. Moreover, the well-designed conductive networks of MCCN@C material by interconnected carbon chambers can promote the fast electron transfer and electrolyte penetration. In Li-S batteries, MCCN-S@C composite cathodes deliver significantly enhanced electrochemical performance with high reversible capacity of 1,163 mAh g-1 at 0.2 C after 100 cycles, remarkable rate capability (626 mAh g-1 at 5.0 C) and ultrahigh long-term cycle stability under high rates (651 mAh g-1 after 1,000 cycles at 2.0 C with 0.032% capacity decay per cycle). More importantly, MCCN@C-S composite cathode with 3.6 mg cm-2 sulfur also delivers a high and stable electrochemical performance over 200 cycles.

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Publication details

The article was received on 29 Mar 2018, accepted on 14 May 2018 and first published on 16 May 2018


Article type: Paper
DOI: 10.1039/C8TA02911C
Citation: J. Mater. Chem. A, 2018, Accepted Manuscript
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    Engineering Multi-Chambered Carbon Nanospheres@Carbon as Efficient Sulfur Hosts for Lithium-Sulfur Batteries

    S. wu, Q. Cao, M. Wang, T. Yu, H. Wang and S. Lu, J. Mater. Chem. A, 2018, Accepted Manuscript , DOI: 10.1039/C8TA02911C

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