Electrocatalysis of polysulfide conversion via sulfur–cobalt CoS2 on a carbon nanotube surface as a cathode for high-performance lithium–sulfur batteries

doi:10.1007/s10008-019-04301-w

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	Electrocatalysis of polysulfide conversion via sulfur–cobalt CoS2 on a carbon nanotube surface as a cathode for high-performance lithium–sulfur batteries
	Su, Wenxiao 1; Feng, Wangjun 1,2; Wang, Shejun 3; Chen, Linjing 1; Li, Miaomiao 1; Song, Changkun 1
刊名	Journal of Solid State Electrochemistry
	2019-07-19
卷号	23 期号:7 页码:2097-2105
关键词	Association reactions Carbon disulfide Carbon nanotubes Cathodes Electric discharges Electrocatalysis Electrocatalysts Growth kinetics Kinetics Lithium Lithium batteries Lithium compounds Reaction kinetics Sulfur Charge and discharge Cobalt disulphide Electrical conductivity Electrochemical kinetics Electrochemical reactions High energy densities Initial discharge capacities Number of active sites
ISSN号	14328488
DOI	10.1007/s10008-019-04301-w
英文摘要	Lithium–sulfur batteries received intense attention because of their high-energy density and inexpensive active material. However, the poor electrical conductivity of sulfur, shuttle effect, and slow electrochemical kinetics hinder their application. Herein, cobalt disulfides uniformly in situ grow on the surface of carbon nanotubes to prepare a three-dimensional carbon nanotubes-cobalt disulfide composite material as the sulfur host. The in situ growth cobalt disulfides on the carbon nanotube is confirmed to play the role of electrocatalyst, triggering the oxidation reaction of Li2S6 and Li2S4 at a higher potential, which promotes the conversion of Li2S6 to Li2S4 and Li2S4 to Li2S2, respectively, and significantly enhances the electrochemical reaction kinetics during the charge and discharge process. Particularly, the carbon nanotubes-cobalt disulfide-20 composite provides a suitable number of active sites for Li2S6 and Li2S4 and exerts an initial discharge capacity of 1253 mA h g−1 at 0.1 C and a retentive capacity of 84% after 200 cycles at 0.2 C. © 2019, Springer-Verlag GmbH Germany, part of Springer Nature.
WOS研究方向	Electrochemistry
语种	英语
出版者	Springer New York LLC
WOS记录号	WOS:000474477800014
内容类型	期刊论文
源URL	[http://ir.lut.edu.cn/handle/2XXMBERH/114313]
专题	理学院
作者单位	1.School of Science, Lanzhou University of Technology, Lanzhou; Gansu; 730050, China; 2.State Key Laboratory of Advanced Processing and Recycling Nonferrous Metals, Lanzhou University of Technology, Lanzhou; 730050, China; 3.Department of Basic Course, Lanzhou Institute of Technology, Lanzhou; 730050, China
推荐引用方式 GB/T 7714	Su, Wenxiao,Feng, Wangjun,Wang, Shejun,et al. Electrocatalysis of polysulfide conversion via sulfur–cobalt CoS2 on a carbon nanotube surface as a cathode for high-performance lithium–sulfur batteries[J]. Journal of Solid State Electrochemistry,2019,23(7):2097-2105.
APA	Su, Wenxiao,Feng, Wangjun,Wang, Shejun,Chen, Linjing,Li, Miaomiao,&Song, Changkun.(2019).Electrocatalysis of polysulfide conversion via sulfur–cobalt CoS2 on a carbon nanotube surface as a cathode for high-performance lithium–sulfur batteries.Journal of Solid State Electrochemistry,23(7),2097-2105.
MLA	Su, Wenxiao,et al."Electrocatalysis of polysulfide conversion via sulfur–cobalt CoS2 on a carbon nanotube surface as a cathode for high-performance lithium–sulfur batteries".Journal of Solid State Electrochemistry 23.7(2019):2097-2105.