Bottom-up in situ formation of Fe3O4 nanocrystals in a porous carbon foam for lithium-ion battery anodes

Taegyun Yoon, Changju Chae, Yang Kook Sun, Xin Zhao, Harold H. Kung, Jung Kyoo Lee

Research output: Contribution to journalArticle

175 Citations (Scopus)

Abstract

A facile and scalable process for the in situ formation of Fe 3O4 nanocrystals in a pre-formed carbon foam (CF) (Fe 3O4/CF) was developed, which involved impregnation of an aqueous iron nitrate solution onto CF followed by controlled thermal treatment in an inert atmosphere. N2 adsorption/desorption and BET measurements showed that the CF was a mesoporous carbon with a high pore volume and specific surface area. Transmission electron microscopy, scanning electron microscopy, X-ray diffraction measurement, thermogravimetric analysis, and X-ray photoelectron spectroscopy (XPS) revealed that 5-50 nm Fe3O 4 nanocrystals at a high loading of 78.7 wt% were formed preferentially in the confined pores of CF. When tested for anode material in a Li ion half-cell, the Fe3O4/CF composite was far superior to unsupported Fe3O4 nanocrystals, exhibiting significantly improved Coulombic efficiencies and cycling stability and achieving >780 mA h g-1 after 50 deep charge-discharge cycles with >95% cycling efficiency.

Original languageEnglish
Pages (from-to)17325-17330
Number of pages6
JournalJournal of Materials Chemistry
Volume21
Issue number43
DOIs
Publication statusPublished - Nov 21 2011

ASJC Scopus subject areas

  • Chemistry(all)
  • Materials Chemistry

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