Abstract
Energy crisis due to decaying fossil fuels can be tackled by using electrochemical energy storage devices specially Zn-ion battery for their non-flammability, cost-effectiveness and promising energy density. However, its feasibility requires excellent cathode materials with high Zn2+ intercalation activity. In this regard, vanadium-based compounds at nanoscale regime are very effective. This work presents a profound synthesis of VO2 nanowires and a novel approach to improve its cathodic property by blending it with a multifunctional CuWO4 compound. For the first time VO2/CuWO4 nanocomposite is developed as a cathode material of Zn-ion battery to showcase a promising specific capacity of 479.9 mAh/g at 0.3 A/g. A stable capacity retention of 85% is achieved after 1000 cycles. SEM and TEM analyses confirms a considerable size reduction of VO2 and CuWO4 constituent in the nanocomposite against their pristine counterparts. This size reduction phenomenon could establish a synergistic effect between VO2 and CuWO4 for a favourable pseudo behaviour combining diffusion and capacitive controlled activities.
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