期刊
JOURNAL OF MATERIALS CHEMISTRY A
卷 4, 期 19, 页码 7416-7421出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c6ta00483k
关键词
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资金
- National Natural Science Foundation of China [21572170, 21273166]
- Research Fund for the Doctoral Program of Higher Education of China [20130141110008]
- Outstanding Youth Foundation of Hubei Province [2015CFA045]
- Funds for Creative Research Groups of Hubei Province [2014CFA007]
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.
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