Carbon-Encapsulated Sn at N-Doped Carbon Nanotubes as Anode Materials for Application in SIBs

Boyang Ruan, Hai Peng Guo, Yuyang Hou, Qiannan Liu, Yuanfu Deng, Guohua Chen, Shu Lei Chou, Hua Kun Liu, Jia Zhao Wang

Research output: Journal article publicationJournal articleAcademic researchpeer-review

31 Citations (Scopus)

Abstract

Carbon-encapsulated Sn@N-doped carbon tubes with submicron diameters were obtained via the simple reduction of C@SnO2@N-doped carbon composites that were fabricated by a hydrothermal approach. Sn nanoparticles encapsulated in carbon layers were distributed uniformly on the surfaces of the N-doped carbon nanotubes. The electrochemical performances of the composites were systematically investigated as anode materials in sodium-ion batteries (SIBs). The composite electrode could attain a good reversible capacity of 398.4 mAh g-1when discharging at 100 mA g-1, with capacity retention of 67.3% and very high Coulombic efficiency of 99.7% over 150 cycles. This good cycling performance, when compared to only 17.5 mAh g-1delivered by bare Sn particles prepared via the same method without the presence of N-doped carbon, could be mainly ascribed to the uniform distribution of the precursor SnO2on the substrate of N-doped carbon tubes with three-dimensional structure, which provides more reaction sites to reduce the diffusion distance of Na+, further facilitating Na+-ion diffusion and relieves the huge volume expansion during charging/discharging. These outcomes imply that such a Sn/C composite would provide more options as an anode candidate for SIBs.
Original languageEnglish
Pages (from-to)37682-37693
Number of pages12
JournalACS Applied Materials and Interfaces
Volume9
Issue number43
DOIs
Publication statusPublished - 1 Nov 2017

Keywords

  • 3-D nanotube
  • carbon-encapsulated tin composite
  • hydrothermal approach
  • N-doped carbon nanotubes
  • sodium-ion batteries

ASJC Scopus subject areas

  • Materials Science(all)

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