Journal
JOURNAL OF ALLOYS AND COMPOUNDS
Volume 768, Issue -, Pages 495-502Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2018.07.226
Keywords
Hierarchical carbon composite; N,S codoping; Freestanding cathode; Cycling performance; Li-S batteries
Categories
Funding
- National Natural Science Foundation of China [21276252, 21776042]
- National Key Research and Development Program of China [2016YFB0101203]
- China MOST (Ministry of Science and Technology) Innovation Team in Key Areas [2016RA4053]
- Fundamental Research Funds for the Central Universities [DUT18RC(4)059]
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Lithium sulfur (Li-S) battery is considered as one of promising energy-storage devices owing to its high energy density and low cost. However, it is still a great challenge to explore stable sulfur cathode with high sulfur loading and good cycling performance. Herein, we report a facile method to prepare N,S co-doped hierarchical pore structured carbon foam @porous carbon (CF@N-SPC) through a carbonation process from resin aerogel coated melamine foam with thiourea as the source for N and S codoping. The close combination of a carbon interconnected skeleton and the resin aerogel derived carbon forms the hierarchical pore structure that improves the electron and ion transport. The prepared CF@N-SPC can be used as a freestanding cathode without a conductive additive and a binder. Due to the synergistic effect of the hierarchical pore structure and N, S codoping, the sulfur loading in the carbon foam-based cathode can reach up to 10.6 mg cm(-2). Owing to these unique merits, the CF@N-SPC/S cathode exhibits high capacity and good cycling performance: it yields a discharge capacity of 1212 mA h g(-1) at 0.1 C with 4.0 mg cm(-2) sulfur loading; it also exhibits a good discharge capacity of 668 mA h g(-1) at 0.5 C when the sulfur loading increases to 10.6 mg cm(-2), capacity retained by 72% in 200 cycles; it experiences a very small capacity decay rate of 0.05% per cycle in 700 cycles at 1 C. Our rational design and facile synthesis of the carbon foam-based freestanding cathode is promising and applicable for development of high performance Li-S batteries. (C) 2018 Elsevier B.V. All rights reserved.
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