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Solid State Ionics, Vol.319, 1-6, 2018
Electrophoretically deposited alpha-Fe2O3 and TiO2 composite anchored on rGO with excellent cycle performance as anode for lithium ion batteries
Two nanostructured oxides, alpha-Fe2O3 and TiO2 with a particle diameters 50 nm and 21 nm, were mixed with graphene oxide (GO). Composite thin films on a stainless steel substrate were obtained by electrophoretic deposition (EPD) procedure from water suspensions: alpha-Fe2O3/GO, TiO2/GO and alpha-Fe2O3/TiO2/GO. Subsequently reduction of as-prepared thin films was performed. Thicknesses of acquired films were evaluated in the range of 2-6 mu m. Structure and morphology were investigated as well as electrochemical properties of all samples were studied. The results revealed that alpha-Fe2O3/TiO2/rGO (in this article denoted as FTGO) exhibited the specific discharge capacity of 790 mAh.g(-1) after 150 cycles at the current density 100 mA.g(-1). The improved electrochemical properties were obtained due to rGO uniform dispersion within inter-space of alpha-Fe2O3 and TiO2 as well as synergic effect between both metal and graphene oxides. Additionally, rGO not only has excellent electron conductivity, but also can alleviate the solid-electrolyte interphase film formation. Prepared composite exhibit excellent cycle performance, coulombic efficiency (66%) and rate capability. Therefore, FTGO ternary structure material has perspective application as lithium ion battery anode in comparison with a alpha-Fe2O3/rGO and TiO2/rGO composites. The results showed obtained composite is a promising anode material for high energy and long cycle life lithium ion batteries.