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Issue 19, 2016
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A 2D porous porphyrin-based covalent organic framework for sulfur storage in lithium–sulfur batteries

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Abstract

Covalent organic frameworks (COFs) represent an emerging class of porous crystalline materials and have recently shown interesting applications in energy storage. Herein, we report the construction of a cycle-stable sulfur electrode by embedding sulfur into a 2D COF. The designed porphyrin-based COF (Por-COF), featuring a relatively large pore volume and narrow pore size distribution, has been employed as a host material for sulfur storage in Li–S batteries. With a 55% sulfur loading in the composite, the thus-prepared cathode delivers a capacity of 633 mA h g−1 after 200 cycles at 0.5C charge/discharge rates. Therefore, embedding sulfur in the nanopores of the Por-COF significantly improves the performance of the sulfur cathode. Considering the flexible design of COFs, we believe that it is possible to synthesize a 2D COF host with a suitable pore environment to produce more stable Li–S batteries, which may help in exploration of the structure–property relationship between the host material and cell performance.

Graphical abstract: A 2D porous porphyrin-based covalent organic framework for sulfur storage in lithium–sulfur batteries

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Supplementary files

Article information


Submitted
18 Jan 2016
Accepted
06 Apr 2016
First published
06 Apr 2016

J. Mater. Chem. A, 2016,4, 7416-7421
Article type
Paper

A 2D porous porphyrin-based covalent organic framework for sulfur storage in lithium–sulfur batteries

H. Liao, H. Wang, H. Ding, X. Meng, H. Xu, B. Wang, X. Ai and C. Wang, J. Mater. Chem. A, 2016, 4, 7416
DOI: 10.1039/C6TA00483K

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