Syntheses of Fe₃O₄ and Fe₃O₄/Graphene Composites and Electrochemical Properties Researches as Anodes for Lithium Ion Batteries

Abstract:

Fe₃O₄ microspheres and its composities with graphene are prepared by the controlled thermal decomposition of an iron alkoxide precursor, which are obtained via an ethylene glycol (EG) mediated solvothermal reaction of ferric chloride hexahydrate (FeCl₃·6H₂O) and sodium acetate (NaAc) with graphene dopings. The resulting Fe₃O₄ microspheres are uniform with a diameter of 0.2-0.5μm. Electrochemical properties of both Fe₃O₄ microspheres and Fe₃O₄/graphene composites are discussed. SEM analysis shows that a large number of Fe₃O₄ particles with spherical morphologies are homogeneously anchored to the rGO sheets surface. Electrochemical results showed that charge and discharge capacities for Fe3O4/graphene composites are larger than those for Fe₃O₄ microspheres electrodes after the 30th cycles which due to the synergistic effect of Fe₃O₄ and graphene. Graphene improves the electronic conductivity of Fe₃O₄ microspheres and increases the interfacial contact area between the Fe₃O₄ microspheres and electrolyte which is benefitable for lithium ion battery. So Fe₃O₄/graphene composites are better anode materials than Fe₃O₄ microspheres.

• Periodical: Advanced Materials Research (Volumes 1033-1034)
• Pages: 155-159
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.1033-1034.155
• Online since: October 2014
• Authors: Li Hua*, Ke Chen, Wen Pan Ke, Liao Chen
• Keywords: Anodes, Fe₃O₄, Fe₃O₄/Graphene Composites, Lithium-Ion Battery

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