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Issue 33, 2019
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Polypyrrole coated hollow metal–organic framework composites for lithium–sulfur batteries

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Abstract

Polypyrrole (PPy) coated hollow metal–organic framework (MOF) composites are synthesized through a simple melt-diffusion method followed by a water-phase dissolution process. Here, we used zeolitic imidazolate framework-67 (ZIF-67) as a precursor and then coated it with a PPy layer (ZIF-67-S-PPy) to prepare a lithium–sulfur battery (Li–S battery) electrode material. The special hollow structure can effectively inhibit device volumetric expansion caused by generated heat. Furthermore, this work also obtained a series of samples containing sulfur to explore the appropriate sulfur ratio. After electrochemical testing, the composites with a sulfur ratio of 60% achieved the highest specific capacity (1092.5 mA h g−1) among the tested samples, and 353.6 mA h g−1 remained after 200 cycles. The specific capacities of ZIF-67-S, S-PPy and sulfur without a host were 599.8 mA h g−1, 328.7 mA h g−1, and 364.8 mA h g−1, respectively, at 0.1C. The results indicated that the capacity of polymer-coated hollow MOF composite electrodes was obviously improved by the designed synthesis strategy, suggesting its potential for high-performance Li–S batteries.

Graphical abstract: Polypyrrole coated hollow metal–organic framework composites for lithium–sulfur batteries

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Publication details

The article was received on 31 May 2019, accepted on 24 Jun 2019 and first published on 04 Jul 2019


Article type: Paper
DOI: 10.1039/C9TA05812E
J. Mater. Chem. A, 2019,7, 19465-19470

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    Polypyrrole coated hollow metal–organic framework composites for lithium–sulfur batteries

    P. Geng, S. Cao, X. Guo, J. Ding, S. Zhang, M. Zheng and H. Pang, J. Mater. Chem. A, 2019, 7, 19465
    DOI: 10.1039/C9TA05812E

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