Introduction The lithium ion batteries have been extensively investigated and widely used in energy devices and storage systems.1 However, the limited mineral reserves and high cost of lithium-based compounds hinder to expand its applications.2To overcome these problems, sodium-ion batteries are proposed as potential alternatives for large-scale energy storage because sodium is more abundant and cheaper. Furthermore, transition metal fluorides are expected to deliver more capacity as these can use more than one oxidation states of transition metals when used as active material.Experimental The pre-weighted RGO (reduced graphene oxide) were mixed in ionic liquid and magnetically stirred for 1 hour so that RGO dispersed homogeneously. After that desired amount of iron nitrate was poured slowly into the solution and let it agitated. All the synthesis process was done in dry room.Results and Discussion X-ray diffraction characterization showed that single phase iron fluoride hydrate was successfully prepared. We investigated the hydration degree of iron fluoride hydrate using TGA. Also, we monitored the crystal structural changes of iron fluoride hydrate by temperature dependent in situ XRD. Temperature dependent XRD shows the formation of different compounds at elevated temperature. Electrochemical properties of iron fluoride hydrate composite electrodes against sodium metal were performed in galvanoststic mode and cycled between 1.5-4.5V under constant current at 0.05, 0.1, 0.25 and 0.5C rates. The sample were discharged to 2V, 1.8V, 1.5V and charged to 4.2V, 4.5V for ex situ characterizations (XRD, NEXAFS, XANES) to determine the electrochemical reaction.References Ellis, B. L.; Lee, K. T.; and Nazar, L. F.Chemistry of Materials, 2010  , 22, 691.Yan, Y.; Yin, Y. X.; Guo, Y. G.; and Wan, L. J. Advanced Energy Materials 2014  , 1301584.

Iron fluoride hydrate/graphene nanocomposites as cathode materials for sodium secondary battery applications

248th National Meeting (2014)

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