High-Performance Aqueous Asymmetric Supercapacitor Based on Hybrid Electrodes

Lithium iron orthosilicate (Li2FeSiO4) with an olivine structure is one of the promising cathode materials for energy storage devices due to its properties like high theoretical capacity, eco-friendly, low price, and extreme affluence. Out of all available energy storage devices, supercapacitors have high power density, fast charging-discharging rate, and high stability. Supercapacitors are of two types symmetric and asymmetric on the basis of fabrication. Here we have tested the performance of different asymmetric supercapacitors consisting of Li2FeSiO4 as cathode and FeOOH, MoSe2, Activated carbon, and graphite as different anode materials. The structural analysis of the prepared sample was done by XRD. Exploration of the electrochemical performances of all designed asymmetric supercapacitors was tested using CV, EIS, and GCD techniques. Li2FeSiO4 and MoSe2-based asymmetric supercapacitor exhibited excellent electrochemical properties delivering specific capacitance of 512 F/g at a current density of 3 A/g, low charge transfer resistance of 0.41 Ω with high power density of 4260 W/Kg corresponding to the energy density of 71 Wh/Kg.