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.
Highlights
The solid polymer electrolytes (SPEs) were applied for lithium batteries since 1979 [1].Over decades, it has become one of the main components in electrochemical devices, such as proton batteries and electrochemical double-layer capacitor (EDLC)
The polyvinyl alcohol (PVA) attachment with OH groups along the main chain is sufficient to have a strong intramolecular and intermolecular is quite close to the previous report [41]
The preparation of CS: PVA: Mg(CF3 SO3 )2 :glycerol polymer electrolytes was performed via a solution cast methodology
Summary
The solid polymer electrolytes (SPEs) were applied for lithium batteries since 1979 [1]. PVA is a nontoxic polymer characterized by enrichment with polar oxygen atom within the vinyl alcohol groups, which facilitates complexation with cations, forming unique polymer electrolyte complexes [13,14] It possesses relatively high dielectric strength, high chemical stability, reasonable charge storage capacity, dopant-dependent electric, optical properties, and abrasion resistance [15]. Nowadays, activated carbon is found to be utilized that have better performance than other materials owing to reasonable chemical durability, big surface area, and good electronic conductivity [34] In dealing with this material, the mechanism of energy storage in EDLC is explained that on the basis of the non-Faradaic mechanism whereby a double layer at the interfacial area is formed as a result of ion accumulation [35]. The relatively high conducting electrolyte is utilized in the fabrication of EDLC
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