The Study of Electrical and Electrochemical Properties of Magnesium Ion Conducting CS: PVA Based Polymer Blend Electrolytes: Role of Lattice Energy of Magnesium Salts on EDLC Performance

Abstract

Plasticized magnesium ion conducting polymer blend electrolytes based on chitosan (CS): polyvinyl alcohol (PVA) was synthesized with a casting technique. The source of ions is magnesium triflate Mg(CF3SO3)2, and glycerol was used as a plasticizer. The electrical and electrochemical characteristics were examined. The outcome from X-ray diffraction (XRD) examination illustrates that the electrolyte with highest conductivity exhibits the minimum degree of crystallinity. The study of the dielectric relaxation has shown that the peak appearance obeys the non-Debye type of relaxation process. An enhancement in conductivity of ions of the electrolyte system was achieved by insertion of glycerol. The total conductivity is essentially ascribed to ions instead of electrons. The maximum DC ionic conductivity was measured to be 1.016 × 10−5 S cm−1 when 42 wt.% of plasticizer was added. Potential stability of the highest conducting electrolyte was found to be 2.4 V. The cyclic voltammetry (CV) response shows the behavior of the capacitor is non-Faradaic where no redox peaks appear. The shape of the CV response and EDLC specific capacitance are influenced by the scan rate. The specific capacitance values were 7.41 F/g and 32.69 F/g at 100 mV/s and 10 mV/s, respectively. Finally, the electrolyte with maximum conductivity value is obtained and used as electrodes separator in the electrochemical double-layer capacitor (EDLC) applications. The role of lattice energy of magnesium salts in energy storage performance is discussed in detail.

Structural, Electrical and Electrochemical Properties of Glycerolized Biopolymers Based on Chitosan (CS): Methylcellulose (MC) for Energy Storage Application

“…The leaf-like shape of the CV curve is observed at a higher scan rate turned to a rectangular-like shape when the scan rates are reduced. The factors that affect these changes could be the porosity of carbon electrodes and the internal resistance presence during the scanning process [ 101 , 102 ]. The non-Faradaic process means the EDLC’s charge storage mechanism depends on ion buildup at the interfaces between electrodes and electrolytes [ 48 , 66 ].…”

Bio-Based Plasticized PVA Based Polymer Blend Electrolytes for Energy Storage EDLC Devices: Ion Transport Parameters and Electrochemical Properties

“…This study has shown that dielectric properties of the PE are highest with incorporation of 50 wt.% of glycerol. This indicates the existence of a large number of charge carrier and thus relatively high conductivity [77].…”

A Polymer Blend Electrolyte Based on CS with Enhanced Ion Transport and Electrochemical Properties for Electrical Double Layer Capacitor Applications

“…Aniskari et al [68] also reported the highest conducting electrolyte also had the highest percentage of free ions. By employing the percentage of free ions for each electrolyte, the transport parameters of number density (n), ionic mobility (µ), and diffusion coefficient (D), can be calculated using the Equations (16)- (18), where N A is Avogadro's constant, M represents the number of moles of glycerol, and e is the elementary charge. V Total is the total volume of the polymer electrolytes.…”

“…It has been reported that EDLC has higher power density and easier fabrication methods compared to Faradaic capacitor or pseudocapacitor [ 15 , 16 , 17 ]. Activated carbon is the most commonly used active material in the electrodes of an EDLC [ 18 , 19 , 20 ]. Various activated carbons have been synthesized from different sources such as nori-based [ 21 ], tofu-based [ 22 ], dimocarpus longan-based [ 23 ], coconut shell-based [ 24 ], and many more.…”