Flexible freestanding Fe2O3-SnOx-carbon nanofiber composites for Li ion battery anodes

Bhavana N. Joshi, Seongpil An, Yong Il Kim, Edmund P. Samuel, Kyo Yong Song, Il Won Seong, Salem S. Al-Deyab, Mark T. Swihart, Wooyoung Yoon, Suk Goo Yoon

Research output: Contribution to journalArticle

16 Citations (Scopus)

Abstract

We demonstrate electrospun ternary Fe2O3-SnOx-carbon nanofiber (CNF) composites as high-performance, flexible, and freestanding anodes for Li ion batteries (LIBs). In the ternary composites, the CNF matrix accommodates volume changes of Fe and Sn during lithiation and delithiation, while also providing short Li ion diffusion pathways, which ultimately enhances the capacity of the LIB. The concentrations of Fe and Sn were varied to find the optimal composition. Higher Sn content increased capacity at slow discharge rates, but decreased capacity at higher discharge rates. Increasing Fe to Sn ratio improved performance at high discharge rates. The Fe2O3-SnOx-CNF composite fabricated at a Fe:Sn weight ratio of 3:1 exhibited a reversible capacity value of 756 mAh·g−1 after 55 cycles. The materials and methods demonstrated here are unique in producing a flexible, free-standing mat with high gravimetric capacity using a simple and scalable production process.

Original languageEnglish
Pages (from-to)259-266
Number of pages8
JournalJournal of Alloys and Compounds
Volume700
DOIs
Publication statusPublished - 2017 Apr 5

Keywords

  • Carbon nanofiber
  • Electrospinning
  • FeO
  • Freestanding
  • Lithium ion battery
  • SnO

ASJC Scopus subject areas

  • Mechanics of Materials
  • Mechanical Engineering
  • Metals and Alloys
  • Materials Chemistry

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    Joshi, B. N., An, S., Kim, Y. I., Samuel, E. P., Song, K. Y., Seong, I. W., Al-Deyab, S. S., Swihart, M. T., Yoon, W., & Yoon, S. G. (2017). Flexible freestanding Fe2O3-SnOx-carbon nanofiber composites for Li ion battery anodes. Journal of Alloys and Compounds, 700, 259-266. https://doi.org/10.1016/j.jallcom.2017.01.057