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MOF derived Porous N-Co3O4@N-C nanododecahedral Wrapped With Reduced Graphene Oxide as High Capacity Cathodes for Lithium-Sulfur Batteries

Abstract

Lithium–sulfur (Li-S) battery has been regarded as a highly promising rechargeable energy-storage system due to its high energy density of 2567 Wh kg-1. Moderating the dissolution of lithium polysulfides (LiPSs) and enhancing the conductivity of the sulfur cathode are main factors for the successful application of Li-S batteries. Here, we demonstrated an approach to tackle these two barriers at once by design porous N-Co3O4@N-C nanododecahedral, this composite derived from ZIF-67 by a facile pyrolysis method, realizing the effective doping of nitrogen both into the Co3O4 and carbon framework, simutaneously achieving well-defined porous structure. After wrapping with reduced graphene oxide (rGO), this porous N-Co3O4@N-C/rGO cathode supports high sulfur loading (5.89 mg cm-2) and yields excellent stability (611 mA h g-1 at 2 C after 1000 cycles). We further combined the ex situ Raman, ex situ X-ray Photoelectron Spectroscopy, UV-vis absorption spectra and first-principles calculations, confirming that N-Co3O4@N-C/rGO nanododecahedral can effectively bind LiPSs in the electrode over cycles. It proved that the cobalt oxides in the porous N-Co3O4@N-C nanododecahedral have strong affinity for binding LiPSs. The simultaneously doping of nitrogen both into the coablt oxides and carbon framework not only strengthens the binding energy for LiPSs absorption, but also improves the overall conductivity of the nanododecahedral. Meanwhile, the interconnected porous structure contributes to the electron transfer and alleviates the volume changes of active materials during cycling.

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Publication details

The article was received on 22 Nov 2017, accepted on 11 Jan 2018 and first published on 11 Jan 2018


Article type: Paper
DOI: 10.1039/C7TA10272K
Citation: J. Mater. Chem. A, 2018, Accepted Manuscript
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    MOF derived Porous N-Co3O4@N-C nanododecahedral Wrapped With Reduced Graphene Oxide as High Capacity Cathodes for Lithium-Sulfur Batteries

    J. Xu, W. Zhang, Y. Chen, H. fan, D. Su and G. Wang, J. Mater. Chem. A, 2018, Accepted Manuscript , DOI: 10.1039/C7TA10272K

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