BARC/PUB/2020/0058

 
 

Structural and electrochemical performance studies for nanocomposites of carbon with Fe3C or Mn-Substituted (Fe3C/Fe3O4) as anodes for Li-batteries

 
     
 
Author(s)

Gangwar, A.; Sharma, A.; Shaw, S. K.; Meena, S. S.; and others
(SSPD)

Source

Applied Surface Science, 2020. Vol. 533: Article no. 147474

ABSTRACT

The nanocomposites of Fe3O4 or Fe3 CorFe3O4/Fe3C with carbon are exploited as anode materials for Li-ion batteries due to their higher theoretical capacities. The present work depicts the charging capacity of nano-composites (~5–25 nm) of carbon with Fe3C or MnrFe3-r/Mns Fe3-sO4(where 0.2 ≤ r+s ≥0.7). These composites are synthesized using an inexpensive urea assisted sol –gel route which are then heat treated at 700 °Cin an inert atmosphere. The x-ray and electron diffractions validate the presence of Fe3C, Fe3O4, and carbon phases in the samples. The X-ray photoelectron spectroscopy depicts the oxidation states for the elements of nanocomposite M7FOC. Mössbauer spectroscopy further supports the findings of earlier studies. The electrode kinetics and the electrochemical performance for the materials are assessed by Voltammograms and Galvanostatic lithiation/delithiation plots. The specific charge capacities and Coulombic efficiencies with re-spect to cycle numbers at room temperature are also evaluated. The optimum specific capacity of ~1261 mAhg−1is observed for M7FOC sample whereas its reversible specific lithiation capacity is found to be around 841mAh g−1 after the initial cycle at the rate of C/20.

 
 
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