O. Eksik, R. Yavuz, N. Karatepe
İstanbul Technical University,
Keywords: lithium ion battery, graphene, nanocomposite
Summary:Graphene-based nanocomposites have been demonstrated to be promising high-capacity anodes for lithium ion batteries to satisfy the ever growing demands for higher capacity, longer cycle life and better high-rate performance. In this study, graphene–metal based anode materials which have high mechanical, electrochemical, electrical and thermal properties were synthesized. To synthesize graphene-based composite anode materials, primarily bulk graphite was oxidized by using modified Hummers method and then graphite oxide was reduced to nano graphene material through thermal exfoliation method. By virtue of this technique, from bulk graphite good quality graphene in high quantities were obtained. Finally, nano metal particle silisium dioxide (SiO2) were added into the graphene nano structure to produce graphene-metal hybrid material. Structural characterization of the obtained samples were characterized by surface electron microscope (SEM), X-Ray Diffraction (XRD) and Raman Spectroscopy. Also prepared composite sample and graphene have been formed to lithium ion coin cells and battery performances have been observed by galvanostatic measurement techniques.