Vanadium pentoxide (V2O5) as an electrode material, has attracted a great attention due to its stable layered crystal structures and high faradiac activity. Unfortunately, low electronic conductivity and Li+ ion diffusion of V2O5 are two limiting factors to prepare high energy, high power electrodes for supercapacitors. These limitations can be overcome by using nanostructured V2O5, which exhibits higher Li+ ion diffusion rates. Moreover, combining V2O5 with conducting materials greatly enhances the electronic conductivity of the composite electrodes. However, in many applications binders are used to combine V2O5 and carbon materials. These binder materials degrade the overall performance of electrode materials by introducing extra weight and nonconducting void spaces. In this study, we prepared all nanostructured, freestanding graphene-V2O5 nanowire (Gr-VNW) composite paper electrodes without using binders. These composite paper electrodes were used as the anode of the coin cell type (CR2032) supercapacitors.  Cyclic voltammetry and charge/ discharge measurements were performed in 2 V potential window using 1M Lithium bis(trifluoromethanesulfonamide) (LiTFSI) in acetonitrile as an electrolyte. The effect of the graphene and VNW composition on the capacitive behavior was studied by varying the compositions of the electrode. The optimized Gr-VNW paper electrode exhibits an energy density of 38.7 Wh/Kg and a power density of 4.0 kW/Kg. The specific capacity of 80 F/g was calculated for the device based on the total weight of the electrodes.

Binder free, flexible graphene/V<sub>2</sub>O<sub>5 </sub>nanowire composite electrodes for supercapacitors

244th National Meeting (2012)

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Binder free, flexible graphene/V2O5 nanowire composite electrodes for supercapacitors

Binder free, flexible graphene/V₂O₅nanowire composite electrodes for supercapacitors