Macroporous Fe3O4/carbon composite microspheres with a short Li+ diffusion pathway for the fast charge/discharge of lithium ion batteries

Seung Ho Choi, You Na Ko, Kyeong Youl Jung, Yun Chan Kang

Research output: Contribution to journalArticlepeer-review

33 Citations (Scopus)

Abstract

Macroporous Fe3O4/carbon composite and core-shell Fe3O4@carbon composite microspheres have been prepared by means of one-pot spray pyrolysis. The addition of polystyrene (PS) nanobeads to a spray solution containing an iron salt and poly(vinylpyrrolidone) (PVP) led to macroporous Fe3O4/carbon composite microspheres, the carbon and iron components of which are uniformly distributed over the entire composite microsphere. The pore-size distribution curve for the macroporous Fe3O4/carbon composite shows distinct peaks at around 10 and 80 nm. An electrode prepared from the macroporous Fe3O 4/carbon composite microspheres showed better cycling and rate performances than an electrode formed from core-shell Fe3O 4@carbon composite microspheres. The initial discharge and charge capacities of the macroporous Fe3O4/carbon composite microsphere electrode were determined to be 1258 and 908 mA h g-1 at 2 A g-1, respectively, and the corresponding initial coulombic efficiency was 72 %. The composite microsphere electrode cycled 500 times at 5 A g-1 showed a high discharge capacity of 733 mA h g-1.

Original languageEnglish
Pages (from-to)11078-11083
Number of pages6
JournalChemistry - A European Journal
Volume20
Issue number35
DOIs
Publication statusPublished - 2014 Aug 25
Externally publishedYes

Keywords

  • batteries
  • energy storage
  • iron
  • nanostructures
  • porous materials
  • spray pyrolysis

ASJC Scopus subject areas

  • Catalysis
  • Organic Chemistry

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