Cobalt Sulfide Confined in N-Doped Porous Branched Carbon Nanotubes for Lithium-Ion Batteries
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LETTER
Cite as Nano-Micro Lett. (2019) 11:29 Received: 18 February 2019 Accepted: 15 March 2019 © The Author(s) 2019
https://doi.org/10.1007/s40820-019-0259-z
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 * Yongsheng Zhou, [email protected]; Xueji Zhang, [email protected] College of Chemistry and Materials Engineering, Anhui Science and Technology University, Bengbu 233030, People’s Republic of China 2 Key Laboratory of Inorganic Coating Materials CAS, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 200050, People’s Republic of China 1
3
4
5
6
Key Laboratory of Interface Science and Engineering in Advanced Materials, Ministry of Education, Taiyuan University of Technology, Taiyuan 030024, People’s Republic of China Beijing Key Laboratory for Bioengineering and Sensing Technology, Research Center for Bioengineering and Sensing Technology, School of Chemistry and Bioengineering, University of Science and Technology Beijing, 30 Xueyuan Road, Haidian District, Beijing 100083, People’s Republic of China Department of Zoology, College of Science, King Saud University, Riyadh, Saudi Arabia Department of Zoology, GC University, Faisalabad, Pakistan
HIGHLIGHTS • A novel hierarchical structure constructed by encapsulating cobalt sulfide nanowires within nitrogen-doped porous branched carbon nanotubes (NBNTs) is designed for lithium-ion batteries. • 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.
ABSTRACT Lithium-ion batteries (LIBs) are considered new gen‑
Charge storage mechanism
eration of large-scale energy-storage devices. However, LIBs suffer from a lack of desirable anode materials with excellent specific capac‑
ity and cycling stability. In this work, we design a novel hierarchi‑
Co9S8@NBNT
cal 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 capac‑
Separator
e−
e−
Li ion Li metal
ity of 1109 mAh g−1 at a current density of 0.5 A g−1 with coulombic
Li+ in micro/mesopore
e−
efficiency reaching almost 100% for 200 cycles. The excellent rate and cycling capabilities can be ascribed to the hierarchical porosity of the one-dimensional Co9S8@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 Vol.:(0123456789)
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