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3D interconnected porous carbon nanosheet/carbon nanotube as polysulfides reservoir for high performance lithium-sulfur batteries

Abstract

Carbon materials have attracted considerable attention as the host for lithium-sulfur batteries, especially 3D structural carbon matrix. Herein, a novel 3D interconnected porous carbon nanosheet/carbon nanotube (denoted PC/CNT) as polysulfides reservoir is demonstrated by a simple one-pot pyrolysis method. In the designed hybrid carbon matrix, porous carbon nanosheets exhibit hierarchical porous structures for high sulfur loading and effectively strengthen the physical confinement to trap soluble polysulfides, while carbon nanotubes provide a highly and robust conductive pathway which can facilitate electrons transport and maintain the structural integrity. Moreover, 3D interconnected structure combining 1D carbon nanotubes and 2D porous carbon nanosheets is beneficial for rapid electrical/ionic transport and favorable electrolyte infiltration. As a result, the S-PC/CNT composite exhibits outstanding electrochemical performance, with a high active-sulfur utilization, high specific capacity (1485.4, 1300.3 and 1138 mA h g-1 at 0.5, 1 and 2 C, respectively), superior cycle stability (only 0.1% capacity decay per cycle over 400 cycles at 2 C) and excellent rate capability (the reversible capacity of 749 mAh g-1 even at 4C)

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Publication details

The article was received on 12 Sep 2017, accepted on 30 Nov 2017 and first published on 01 Dec 2017


Article type: Paper
DOI: 10.1039/C7NR06805K
Citation: Nanoscale, 2017, Accepted Manuscript
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    3D interconnected porous carbon nanosheet/carbon nanotube as polysulfides reservoir for high performance lithium-sulfur batteries

    W. Yang, W. Yang, A. Song, G. Sun and G. Shao, Nanoscale, 2017, Accepted Manuscript , DOI: 10.1039/C7NR06805K

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