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Issue 29, 2018
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2D holey cobalt sulfide nanosheets derived from metal–organic frameworks for high-rate sodium ion batteries with superior cyclability

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Abstract

Sodium ion batteries (SIBs) for large-scale grid applications are facing great challenges in terms of development of high-performance electrode materials and screening of suitable electrolytes. Herein, a versatile and scalable protocol for synthesizing two-dimensional (2D) holey cobalt sulfide (h-Co4S3) nanosheets is demonstrated for high-rate and long-life SIBs in an ether-based electrolyte of 1.0 M NaCF3SO3 in diglyme. The 2D h-Co4S3 nanosheets are prepared by sulfuration of leaf-like cobalt based metal–organic frameworks (CoMOFs), and subsequent annealing treatment. Benefiting from the nanosheet nature of in-plane nanopores (10–30 nm), ultra-thinness (<30 nm), crumpled morphology, and micron-scale lateral size that can provide more active sites and enhanced sodiation/desodiation kinetics, the resulting h-Co4S3 nanosheets achieve a high reversible capacity of 571 mA h g−1 at 0.1 A g−1, and long-life cycling stability with a retention of 80% after 400 cycles for SIBs. Furthermore, theoretical simulation reveals the enhanced structural stability of h-Co4S3 nanosheets with a lower binding energy (0.31 eV) of the Co–O bond in the ether-based electrolyte than that in the carbonate-based electrolyte. Notably, the h-Co4S3 anode offers an exceptional rate capacity of 257 mA h g−1 at 12 A g−1, outperforming most reported cobalt sulfide-based anodes. This strategy will pave a new way to rationally construct MOF-derived 2D nanostructures for various energy-related applications.

Graphical abstract: 2D holey cobalt sulfide nanosheets derived from metal–organic frameworks for high-rate sodium ion batteries with superior cyclability

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Publication details

The article was received on 13 Jun 2018, accepted on 02 Jul 2018 and first published on 02 Jul 2018


Article type: Paper
DOI: 10.1039/C8TA05612A
Citation: J. Mater. Chem. A, 2018,6, 14324-14329
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    2D holey cobalt sulfide nanosheets derived from metal–organic frameworks for high-rate sodium ion batteries with superior cyclability

    Y. Dong, W. Shi, P. Lu, J. Qin, S. Zheng, B. Zhang, X. Bao and Z. Wu, J. Mater. Chem. A, 2018, 6, 14324
    DOI: 10.1039/C8TA05612A

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