Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/65831
Title: Ultrafine cobalt sulfide nanoparticles encapsulated hierarchical n-doped carbon nanotubes for high-performance lithium storage
Authors: Li, X
Fu, N
Zou, J
Zeng, X
Chen, Y
Zhou, L 
Lu, W
Huang, H 
Keywords: Cobalt Sulfide
Hierarchical N-doped carbon nanotubes
Lithium-ion battery
ZIF-67
Issue Date: 2017
Publisher: Pergamon Press
Source: Electrochimica acta, 2017, v. 225, p. 137-142 How to cite?
Journal: Electrochimica acta 
Abstract: Nanostructured cobalt sulfide based materials with rational design are attractive for high-performance lithium-ion batteries. In this work, we report a multistep method to synthesize ultrafine cobalt sulfide nanoparticles encapsulated in hierarchical N-doped carbon nanotubes (CoSx@HNCNTs). Co-based zeolitic imidazolate framework (ZIF-67) nanotubes are obtained from the reaction between electrospun polyacrylonitrile/cobalt acetate and 2-methylimidazole, followed by the dissolution of template. Next, a combined calcination and sulfidation process is employed to convert the ZIF-67 nanotubes to CoSx@HNCNTs. Benefited from the compositional and structural features, the as-prepared nanostructured hybrid materials deliver superior lithium storage properties with high capacity of 1200 mAh g−1 at 0.25 A g−1. More importantly, a remarkable capacity of 1086 mAh g−1 can be maintained after 100 cycles at the current density of 0.5 A g−1. Even at a high rate of 5 A g−1, a reversible capacity of 592 mAh g−1 after 1600 cycles can still be achieved.
URI: http://hdl.handle.net/10397/65831
ISSN: 0013-4686
DOI: 10.1016/j.electacta.2016.12.127
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