Executive Summary : | The COP26 commitment of net-zero emission by 2070 requires the replacement of conventional fossil fuels with sustainable sources. However, the intermittent nature of these renewable energy sources limits their exclusive exploration. To ensure uninterrupted energy supply, new energy storage devices are needed. Li-ion batteries (LIBs) have been a game-changer, but due to the natural scarcity of Li, cost is a concern. Na-ion batteries (SIBs) have emerged as a solution, but they have poor energy density and longer cyclability. Hybrid Li-ion capacitors (HLCs) have been developed to bridge the performance gap between battery and supercapacitors, but face the same concern of limited natural stock of Li. Hybrid Na-ion Capacitors (HSCs) are emerging as promising candidates for low-cost and sustainable energy devices. Research on HSCs is still in infancy due to the size difference between Li+ and Na+. Polyanionic NaSICON type materials have shown great promise, and scientists have attempted to tune their properties by doping and compositing with other metals and materials. This proposal aims to tune the electronic structure of a relatively less explored NaSICON type material Na3V2(PO4)3 (NVP) through doping with different transition metals and electronegative elements. The resulting doped-NVP will be in situ composited with waste plastic derive carbon sheet (W-car) to obtain a doped-NVP/W-car composite. The device assembly will be done using neat W-car as an anode. Based on the electrochemical performance of the doped-NVP/W-car (cathode)// W-car (anode) devices, the best combination will be chosen and further optimized to scale up the process for real applications. |