NDLI: Intercalated Co(OH)<sub>2</sub>-derived flower-like hybrids composed of cobalt sulfide nanoparticles partially embedded in nitrogen-doped carbon nanosheets with superior lithium storage

Content Provider	Royal Society of Chemistry (RSC)
Author	Yang, Wensheng Lu, Yanluo Bai, Fan Wang, Jun Chen, Xu
Copyright Year	2017
Abstract	Cobalt sulfides are considered as one of the most promising alternative anode materials for high-performance lithium-ion batteries by virtue of their remarkable electrical conductivity and high theoretical capacity. However, the volume expansion of cobalt sulfides and polysulfide shuttling effect during the discharge/charge process result in a poor cycling stability and low rate capability. Herein, we report the designed synthesis of a flower-like structure, including cobalt sulfide nanoparticles with a small particle size partially embedded within the nitrogen-doped carbon nanosheets and few-layer graphene covering the external surface of cobalt sulfides (Co9S8/Co1−xS@NC), by simultaneous decomposition and sulfidation of a metanilic anion intercalated Co(OH)2 precursor. Through adjusting the annealed temperature and the mass ratio of the precursor and S powders, the composition of cobalt sulfides could be easily controlled. Co9S8/Co1−xS@NC prepared under optimized conditions exhibits a high reversible capacity of 1230 mA h g−1 after 110 cycles, excellent rate capability (≈1016, 979, 931, 813 mA h g−1 at the current densities of 200, 500, 1000, and 2000 mA g−1, respectively), and stable cycling performance (≈98.4% capacity retention after 110 cycles). Significantly, this intercalated Co(OH)2-derived strategy can be expanded to the preparation of other metal sulfides and carbon composites for application in other energy conversion and storage devices.
Starting Page	3628
Ending Page	3637
Page Count	10
File Format	HTM / HTML PDF
ISSN	20507488
Volume Number	5
Issue Number	7
Journal	Journal of Materials Chemistry A
DOI	10.1039/c6ta10151h
Language	English
Publisher	Royal Society of Chemistry
Access Restriction	Open
Subject Keyword	Anode Lithium-ion battery Electrical resistivity and conductivity Cobalt Polysulfide Cobalt sulfide Carbon Graphene Ion
Content Type	Text
Resource Type	Article
Subject	Chemistry Renewable Energy, Sustainability and the Environment Materials Science

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