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Impregnation of Sulfur into a 2D Pyrene-Based Covalent Organic Framework for High-Rate Lithium-Sulfur Batteries

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 pyene-based 2D COF (Py-COF), we succeed in construction of lithium-sulfur (Li-S) batteries with high-rate capacity and long-term stability. For example, the Py-COF/S cathode can deliver a reversible capacity of 481.2 mAh g1 up to 550 cycles at 5.0 C (1 C = 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 COFs-based Li-S batteries, and more impressively, even beyond some porous carbon-based sulfur host electrodes. Specifically, by using the commercially available porous carbon BP2000 as sulfur host under the same conditions, the thus-prepared electrode can only exhibit a reversible capacity of 265 mAh g1 after 220 cycles at 5.0 C, much lower than that of Py-COF/S electrode. According to cyclic voltammetry analysis, this high performance could be attributed to the fast lithium ions transport in the pores of Py-COF, especially at high rate. These results clearly demonstrate that it is reasonable to design a 2D COF sulfur host for high performance Li-S 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, Accepted Manuscript
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    Impregnation of Sulfur into a 2D Pyrene-Based Covalent Organic Framework for High-Rate Lithium-Sulfur Batteries

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

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