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Issue 43, 2011
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Bottom-up in situ formation of Fe3O4nanocrystals in a porous carbon foam for lithium-ion battery anodes

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Abstract

A facile and scalable process for the in situ formation of Fe3O4 nanocrystals in a pre-formed carbon foam (CF) (Fe3O4/CF) was developed, which involved impregnation of an aqueous iron nitrate solution onto CF followed by controlled thermal treatment in an inert atmosphere. N2adsorption/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 Fe3O4 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.

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

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Supplementary files

Article information


Submitted
20 Jul 2011
Accepted
30 Aug 2011
First published
28 Sep 2011

J. Mater. Chem., 2011,21, 17325-17330
Article type
Paper

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

T. Yoon, C. Chae, Y. Sun, X. Zhao, H. H. Kung and J. K. Lee, J. Mater. Chem., 2011, 21, 17325
DOI: 10.1039/C1JM13450G

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