Formation of graphene-encapsulated CoS2 hybrid composites with   hierarchical structures for high-performance lithium-ion batteries

doi:10.1039/c7ra07068c

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	Formation of graphene-encapsulated CoS2 hybrid composites with hierarchical structures for high-performance lithium-ion batteries
	Tao, Shi ; Huang, Weifeng ; Xie, Hui ; Zhang, Jing ; Wang, Zhicheng ; Chu, Wangsheng ; Qian, Bin ; Song, Li
刊名	RSC ADVANCES
	2017
关键词	X-RAY-ABSORPTION IMPROVED ELECTROCHEMICAL PERFORMANCE ENERGY-STORAGE ANODE MATERIAL HOLLOW MICROSPHERES ELECTRODE MATERIALS COBALT SULFIDES OXIDE CONVERSION NANOPARTICLES
DOI	10.1039/c7ra07068c
英文摘要	Transitionmetal sulfides (TMSs) are considered as themost promising alternative anodematerials for advanced lithium-ion batteries (LIBs). Here, we report a hierarchically structured CoS2 nanosphere/graphene (CoS2/G) composite, fabricated by a simple hydrothermal method. This composite, assembled with CoS2 nanoparticles uniformly distributed on the graphene, exhibits excellent electrochemical performance. In particular, the CoS2/G electrode material delivers a high rate capability of around 398 mA h g(-1) at a current density of 3500 mA g(-1). Moreover, a discharge capacity of about 400 mA h g(-1) can be obtained after 1000 cycles at a current density of 500 mA g(-1). X-ray absorption spectroscopy is used to characterize the sample for the first time, and the results demonstrate that CoS2/G is reduced to metallic Co and Li2S when discharged to 0.01 V. In subsequent charge-discharge processes, the metallic Co cannot be fully oxidized to CoS2, which is the main cause of capacity loss for the CoS2 electrode.; National Natural Science Foundation of China [11275227, 11605002, 11605201, 616040215]; China Postdoctoral Science Foundation [2015M580925]; Youth Innovation Promotion Association, CAS; Natural Science Foundation of Jiangsu Educational Department [15KJA430001]; Six-talent Peak of Jiangsu Province [2012-XCL-036]; SCI(E); ARTICLE; 63; 39427-39433; 7
语种	英语
内容类型	期刊论文
源URL	[http://ir.pku.edu.cn/handle/20.500.11897/475858]
专题	工学院
推荐引用方式 GB/T 7714	Tao, Shi,Huang, Weifeng,Xie, Hui,et al. Formation of graphene-encapsulated CoS2 hybrid composites with hierarchical structures for high-performance lithium-ion batteries[J]. RSC ADVANCES,2017.
APA	Tao, Shi.,Huang, Weifeng.,Xie, Hui.,Zhang, Jing.,Wang, Zhicheng.,...&Song, Li.(2017).Formation of graphene-encapsulated CoS2 hybrid composites with hierarchical structures for high-performance lithium-ion batteries.RSC ADVANCES.
MLA	Tao, Shi,et al."Formation of graphene-encapsulated CoS2 hybrid composites with hierarchical structures for high-performance lithium-ion batteries".RSC ADVANCES (2017).