Journal
NANO-MICRO LETTERS
Volume 11, Issue 1, Pages -Publisher
SHANGHAI JIAO TONG UNIV PRESS
DOI: 10.1007/s40820-019-0259-z
Keywords
Lithium-ion batteries; Nitrogen doping; Cobalt sulfide; Branched carbon nanotubes
Funding
- Natural Science Foundation of Anhui Province [KJ2018A0534]
- research fund of Anhui Science and Technology University [ZRC2014402]
- Materials Science and Engineering Key Discipline Foundation [AKZDXK2015A01]
- Deanship of Scientific Research at King Saud University [1436-011]
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HighlightsA 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 1310mAhg(-1) at a current density of 0.1Ag(-1). AbstractLithium-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 1310mAhg(-1) at a current density of 0.1Ag(-1), and was able to maintain a stable reversible discharge capacity of 1109mAhg(-1) at a current density of 0.5Ag(-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-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.
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