FeS2/C composite as an anode for lithium ion batteries with enhanced reversible capacity

Carbon coated FeS2 (FeS2/C) composite is prepared via a simple solid state reaction using glucose as carbon source. The porous FeS2 particles are uniformly surrounded by the amorphous carbon coating. As an anode material for lithium ion batteries, the FeS2/C composite exhibits higher reversible capa...

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Bibliographic Details
Published in:Journal of power sources 2012-11, Vol.217, p.229-235
Main Authors: Zhang, D., Mai, Y.J., Xiang, J.Y., Xia, X.H., Qiao, Y.Q., Tu, J.P.
Format: Article
Language:English
Subjects:
Anodes
Applied sciences
Carbon
Carbon coating
Carbon-carbon composites
Coating
Cycle performance
Cycles
Direct energy conversion and energy accumulation
Electrical engineering. Electrical power engineering
Electrical power engineering
Electrochemical conversion: primary and secondary batteries, fuel cells
Exact sciences and technology
Iron disulfide
Lithium ion battery
Lithium-ion batteries
Materials
Scanning electron microscopy
X-rays
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Summary:Carbon coated FeS2 (FeS2/C) composite is prepared via a simple solid state reaction using glucose as carbon source. The porous FeS2 particles are uniformly surrounded by the amorphous carbon coating. As an anode material for lithium ion batteries, the FeS2/C composite exhibits higher reversible capacity and better cycling performance than the unmodified FeS2. The specific capacity of the FeS2/C composite after 50 cycles is 495 mAh g−1, much higher than that of FeS2 (345 mAh g−1). In order to investigate the effect of carbon coating, the cycled electrodes have been analyzed by X-ray diffraction (XRD), scanning electron microscopy (SEM) and X-ray photoelectron spectroscopy (XPS). The improvement is attributed to the introduction of carbon coating, which can enhance the conductivity, reduce the dissolution of sulfur and corrosion from HF, and stabilize the porous structure during cycling. ► FeS2/C composite is prepared by a simple solid state reaction for the first time. ► The result of XPS shows the carbon coating can reduce the corrosion from HF. ► The result of ICP shows the carbon coating can reduce the dissolution of sulfur. ► FeS2/C composite shows superior electrochemical performance.
ISSN:0378-7753
1873-2755
DOI:10.1016/j.jpowsour.2012.05.112