Electrical properties and electrochemical performances of Na sub(2)O doped solid electrolytes for supercapacitor application

Abstract

A series of Na sub(2)O-doped glassy systems, represented as xNa sub(2)O - (1 - x)(0.3 PbCl sub(2) - 0.1 ZnO - 0.6V sub(2)O sub(5)), with x values of 0, 0.05, 0.1, and 0.2, were prepared using a melt quenching method. The electrical conductivity of as-developed samples was examined over a wide range of temperatures and frequencies. High-frequency dispersion in the AC conductivity spectra was indicated by the frequency exponent (n) values, which suggest a percolation type of motion for charge carriers. The power law pre-factor (A) was utilized to investigate the strong composition dependence of the system. Variations in power factors (n and S values) may be attributed to mixed charge carrier conduction. Additionally, Na sup(+) intercalation pseudocapacitance might facilitate rapid ion diffusion through one-dimensional, two-dimensional, or three-dimensional transport pathways that involve Faradaic charge transfer. Notably, the specific capacitance (C sub(sp)) increases from 60.51Fg sup(-1) for x=0 to 88.57Fg sup(-1) for x=0.05, highlighting significant enhancement due to greater open surface area. This suggests that the current system can be considered a supercapacitor within the category of pseudocapacitance-diffusion-controlled Faradaic systems. Furthermore, the specific energy shows an increase of 6.3 percent, while the specific power decreases by 20 percent with the addition of a small amount of Na to the host system. These characteristics underscore the potential of this system as an effective supercapacitor.