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Issue 43, 2010
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Carbonnanocages with nanographene shell for high-rate lithium ion batteries

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Abstract

Carbon nanocages with a nanographene shell have been prepared by catalytic decomposition of p-xylene on a MgO supported Co and Mo catalyst in supercritical CO2 at a pressure of 10.34 MPa and temperatures ranging from 650 to 750 °C. The electrochemical performance of these carbon nanocages as anodes for lithium ion batteries has been evaluated by galvanostatic cycling. The carbon nanocages prepared at a temperature of 750 °C exhibited relatively high reversible capacities, superior rate performance and excellent cycling life. The advanced performance of the carbon nanocages prepared at 750 °C is ascribed to their unique structural features: (1) nanographene shells and the good inter-cage contact ensuring fast electron transportation, (2) a porous network formed by fine pores in the carbon shell and the void space among the cages facilitating the penetration of the electrolyte and ions within the electrode, (3) thin carbon shells shortening the diffusion distance of Li ions, and (4) the high specific surface area providing a large number of active sites for charge-transfer reactions. These carbon nanocages are promising candidates for application in lithium ion batteries.

Graphical abstract: Carbon nanocages with nanographene shell for high-rate lithium ion batteries

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Supplementary files

Article information


Submitted
02 Jun 2010
Accepted
08 Jul 2010
First published
24 Sep 2010

J. Mater. Chem., 2010,20, 9748-9753
Article type
Paper

Carbon nanocages with nanographene shell for high-rate lithium ion batteries

K. Wang, Z. Li, Y. Wang, H. Liu, J. Chen, J. Holmes and H. Zhou, J. Mater. Chem., 2010, 20, 9748
DOI: 10.1039/C0JM01704C

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