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Ternary Confine-Functional Sulfur Composite with a Host-Sulfur-Container Architecture for Lithium/Sulfur Batteries

Abstract

In this work, a ternary confine-functional sulfur composite with Host-Sulfur-Container structure is designed and synthesized for high performance lithium sulfur batteries. The host in this unique architecture is a porous carbon, which contains interconnected tunnels macropores and with meso/micropores on the tunnel walls of the macropores. These hierarchical pores have synergistic effect to adsorb sulfur in their pore spaces, and provide more nucleation sites to direct the uniform coating of sulfur. Moreover, the interconnected porous structure can facilitate the electron transfer and ensure high sulfur utilization as well. Furthermore, the container of poly(3,4-ethylenedioxythiophene) layer improves the conductivity of the electrode, prevent the diffusion of dissolved polysulfide, and remit the volume expansion during charge-discharge processes. As a result, the electrode of poly(3,4-ethylenedioxythiophene)/ sulfur / porous carbon composite with Host-Sulfur-Container architecture maintains a reversible capacity of 831.9 mAh g-1 after 200 cycles at the current density of 0.5 C and presents a long-term cycling stability with 0.088% capacity decay per cycle over 500 cycles at 1 C. It indicates that the prepared Host-Sulfur-Container composite is a promising cathode material for lithium-sulfur batteries, and the hierarchical tunnel pores carbon host with meso/micropores inside shows great potential in the energy storage field.

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Publication details

The article was received on 03 Aug 2018, accepted on 07 Sep 2018 and first published on 10 Sep 2018


Article type: Paper
DOI: 10.1039/C8NR06252H
Citation: Nanoscale, 2018, Accepted Manuscript
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    Ternary Confine-Functional Sulfur Composite with a Host-Sulfur-Container Architecture for Lithium/Sulfur Batteries

    Y. Wang, X. Liang, J. Yun, P. Shi, P. Lu, Y. Sun and H. Xiang, Nanoscale, 2018, Accepted Manuscript , DOI: 10.1039/C8NR06252H

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