Design and synthesis of bubble-nanorod-structured Fe2O3-Carbon nanofibers as advanced anode material for li-ion batteries

Jung Sang Cho, Young Jun Hong, Yun Chan Kang

Research output: Contribution to journalArticle

328 Citations (Scopus)

Abstract

A structure denoted as a "bubble-nanorod composite" is synthesized by introducing the Kirkendall effect into the electrospinning method. Bubble-nanorod-structured Fe2O3-C composite nanofibers, which are composed of nanosized hollow Fe2O3 spheres uniformly dispersed in an amorphous carbon matrix, are synthesized as the target material. Post-treatment of the electrospun precursor nanofibers at 500°C under 10% H2/Ar mixture gas atmosphere produces amorphous FeOx-carbon composite nanofibers. Post-treatment of the FeOx-carbon composite nanofibers at 300°C under air atmosphere produces the bubble-nanorod-structured Fe2O3-C composite nanofibers. The solid Fe nanocrystals formed by the reduction of FeOx are converted into hollow Fe2O3 nanospheres during the further heating process by the well-known Kirkendall diffusion process. The discharge capacities of the bubble-nanorod-structured Fe2O3-C composite nanofibers and hollow bare Fe2O3 nanofibers for the 300th cycles at a current density of 1.0 A g-1 are 812 and 285 mA h g-1, respectively, and their capacity retentions measured from the second cycle are 84 and 24%, respectively. The hollow nanospheres accommodate the volume change that occurs during cycling. The unique structure of the bubble-nanorod-structured Fe2O3-C composite nanofibers results in their superior electrochemical properties by improving the structural stability during long-term cycling.

Original languageEnglish
Pages (from-to)4026-4035
Number of pages10
JournalACS Nano
Volume9
Issue number4
DOIs
Publication statusPublished - 2015 Apr 28

Keywords

  • bubble nanorod
  • carbon composite
  • electrospinning
  • lithium ion battery
  • nanofibers

ASJC Scopus subject areas

  • Materials Science(all)
  • Engineering(all)
  • Physics and Astronomy(all)

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