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Issue 35, 2018
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Impregnation of sulfur into a 2D pyrene-based covalent organic framework for high-rate lithium–sulfur batteries

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Abstract

Two-dimensional covalent organic frameworks (2D COFs) have recently attracted increasing attention in energy storage devices. Herein, by loading 70 wt% sulfur into a pyrene-based 2D COF (Py-COF), we succeeded in the construction of lithium–sulfur (Li–S) batteries with high-rate capacity and long-term stability. The Py-COF/S cathode can deliver a reversible capacity of 481.2 mA h g−1 for up to 550 cycles at 5.0C (1C = 1680 mA g−1), which is 73.8% of the initial capacity with a decay rate of 0.048% per cycle. This is a benchmark among all reported COF-based Li–S batteries, and more impressively, even beyond the performances of some porous carbon-based sulfur host electrodes. Specifically, by using commercially available porous carbon BP2000 as the sulfur host under the same conditions, the thus-prepared electrode can only exhibit a reversible capacity of 265 mA h g−1 after 220 cycles at 5.0C, much lower than that of the Py-COF/S electrode. According to cyclic voltammetry analysis, this high performance could be attributed to the fast lithium ion transport in the pores of Py-COF, especially at a high rate. These results clearly demonstrate that it is reasonable to design a 2D COF sulfur host for high performance Li–S batteries.

Graphical abstract: Impregnation of sulfur into a 2D pyrene-based covalent organic framework for high-rate lithium–sulfur batteries

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Publication details

The article was received on 10 Jun 2018, accepted on 08 Aug 2018 and first published on 09 Aug 2018


Article type: Paper
DOI: 10.1039/C8TA05508D
Citation: J. Mater. Chem. A, 2018,6, 17186-17191
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    Impregnation of sulfur into a 2D pyrene-based covalent organic framework for high-rate lithium–sulfur batteries

    Y. Meng, G. Lin, H. Ding, H. Liao and C. Wang, J. Mater. Chem. A, 2018, 6, 17186
    DOI: 10.1039/C8TA05508D

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