24August2019

Nano-Micro Letters

Cobalt Sulfide Confined in N-doped Porous Branched Carbon Nanotubes for Lithium-Ion Batteries

Yongsheng Zhou1, 2, *, Yingchun Zhu2, Bingshe Xu3, Xueji Zhang4, *, Khalid A. Al-Ghanim5, Shahid Mahboob5, 6

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Nano-Micro Lett. (2019) 11: 29

First Online: 29 March 2019 (Letter)

DOI:10.1007/s40820-019-0259-z

*Corresponding author. E-mail: yszhou1981@gmail.com (Yongsheng Zhou); zhangxueji@ustb.edu.cn (Xueji Zhang)

 

Abstract

 


Toc

Lithium-ion batteries (LIBs) are considered new generation of large-scale energy-storage devices. However, LIBs suffer from a lack of desirable anode materials with excellent specific capacity and cycling stability. In this work, we design a novel hierarchical structure constructed by encapsulating cobalt sulfide nanowires within nitrogen-doped porous branched carbon nanotubes (NBNTs) for LIBs. The unique hierarchical Co9S8@NBNT electrode displayed a reversible specific capacity of 1310 mAh g‒1 at a current density of 0.1 A g−1, and was able to maintain a stable reversible discharge capacity of 1109 mAh g−1 at a current density of 0.5 A g−1 with coulombic efficiency reaching almost 100% for 200 cycles. The excellent rate and cycling capabilities can be ascribed to the hierarchical porosity of the one-dimensionalCo9S8@NBNT internetworks, the incorporation of nitrogen doping, and the carbon nanotube confinement of the active cobalt sulfide nanowires offering a proximate electron pathway for the isolated nanoparticles and shielding of the cobalt sulfide nanowires from pulverization over long cycling periods.


 

Keywords

Lithium-ion batteries; Nitrogen doping; Cobalt sulfide; Branched carbon nanotubes

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