Electrochemical Mechanism for FeS 2 /C Composite in Lithium Ion Batteries with Enhanced Reversible Capacity

Shengping Wang and Jingxian Yu
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Shengping Wang: Faculty of Material Science and Chemistry, China University of Geosciences, Wuhan 430074, China
Jingxian Yu: ARC Centre of Excellence for Nanoscale BioPhotonics (CNBP), School of Chemistry and Physics, The University of Adelaide, Adelaide, SA 5005, Australia

Energies, 2016, vol. 9, issue 4, 1-9

Abstract: Nanoscale FeS 2 was synthesized via a simple hydrothermal method and was decorated by hydrothermal carbonization (FeS 2 @C). The structural properties of the synthesized materials detected by X-ray diffraction (XRD), together with the morphologies characterized by scanning electron microscopy (SEM) and transmission electron microscopy (TEM) indicated that the hydrothermal carbonization only had an impact on the morphology of pyrite. Additionally, the electrochemical performance of the coated pyrite in Li/FeS 2 batteries was evaluated by galvanostatic discharge-charge tests and electrochemical impedance spectroscopy (EIS). The results showed that the initial capacity of FeS 2 @C was 799.2 mAh·g ?1 (90% of theoretical capacity of FeS 2 ) and that of uncoated FeS 2 was only 574.6 mAh·g ?1 . XRD and ultraviolet (UV) visible spectroscopy results at different depths of discharge-charge for FeS 2 were discussed to clarify the electrochemical mechanism, which play an important part in Li/FeS 2 batteries.

Keywords: composites; electrochemical measurements; electrochemical properties (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2016
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