期刊
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
卷 54, 期 14, 页码 4325-4329出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.201411109
关键词
carbon materials; chemisorption; doping; electrochemistry; lithium-sulfur batteries
资金
- Office of Vehicle Technologies of the U.S. Department of Energy (DOE) [DE-EE0005475]
- U.S. DOE Office of Science [DE-AC02-06CH11357]
- DOE Office of Energy Efficiency and Renewable Energy (EERE) Postdoctoral Research Award under EERE Vehicles Technology Program [DE-AC05-06OR23100]
Despite the high theoretical capacity of lithium-sulfur batteries, their practical applications are severely hindered by a fast capacity decay, stemming from the dissolution and diffusion of lithium polysulfides in the electrolyte. A novel functional carbon composite (carbon-nanotube-interpenetrated mesoporous nitrogen-doped carbon spheres, MNCS/CNT), which can strongly adsorb lithium polysulfides, is now reported to act as a sulfur host. The nitrogen functional groups of this composite enable the effective trapping of lithium polysulfides on electroactive sites within the cathode, leading to a much improved electrochemical performance (1200 mAh g(-1) after 200 cycles). The enhancement in adsorption can be attributed to the chemical bonding of lithium ions by nitrogen functional groups in the MNCS/CNT framework. Furthermore, the micrometer-sized spherical structure of the material yields a high areal capacity (ca. 6 mAh cm(-2)) with a high sulfur loading of approximately 5 mg cm(-2), which is ideal for practical applications of the lithium-sulfur batteries.
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