FeOOH/graphene oxide composite as anode for lithium ion battery

P.S. MARTÍNEZ; M.A. ZENSICH; F. RUIZ; G.M. MORALES; M.S. MORENO

Congreso; 20th Topical Meeting of the International Society of Electrochemistry, Advances in Lithium and Hydrogen Electrochemical Systems for Energy Conversion and Storage; 2017

The development of new electrode materials for lithium-ion battery is a field very active due to the growing performances required to the batteries. Composite materials have gained relevance due to the possibilities of improvements in the material properties and its synthesis in a more efficient way. Also, they offer a wide morphology control, aspect that is relevant for battery charge-discharge kinetic.Iron compounds as oxides and oxyhydroxides (FeOOH), are widely studied for its applications in areas such as environmental, industrial, geology, biology and medicine [1]. Also, FeOOH has been recently reported as a high capacity anode for lithium battery [2]. The synthesis of this material is interesting due to the simplicity of it and because small changes in the synthesis variables enables to obtain different morphologies and size in the material. On the other hand, graphene oxide (GO) has a number of applications because of its high reactivity due to the presence of oxygen containing functional groups on its surfaces. In this work, we present the synthesis of unsupported FeOOH and supported FeOOH/GO compounds, obtained from iron(III) chloride and iron(III) nitrate, as sources of iron, at different reaction times and at 80°C. The samples were characterized by X-ray diffraction, HRTEM, electron diffraction and electrochemical measurements. Our results shows that the use of GO allows to control the particle size as can be clearly seen in figure 1. The obtained compounds depends on the iron source used being β-FeOOH for iron chloride and ferrihydrite for iron nitrate. We also found the conversion of ferrihydrite to hematite for long reaction times. We also present the results of electrochemical characterization for the supported and unsupported materials.