Abstract
Plasticized lithium-ion-based-conducting polymer blend electrolytes based on poly(vinyl alcohol) (PVA):chitosan (CS) polymer was prepared using a solution cast technique. The conductivity of the polymer electrolyte system was found to be 8.457 × 10−4 S/cm, a critical factor for electrochemical device applications. It is indicated that the number density (n), diffusion coefficient (D), and mobility (μ) of ions are increased with the concentration of glycerol. High values of dielectric constant and dielectric loss were observed at low frequency region. A correlation was found between the dielectric constant and DC conductivity. The achieved transference number of ions (tion) and electrons (te) for the highest conducting plasticized sample were determined to be 0.989 and 0.011, respectively. The electrochemical stability for the highest conducting sample was 1.94 V, indicated by linear sweep voltammetry (LSV). The cyclic voltammetry (CV) response displayed no redox reaction peaks through its entire potential range. Through the constructing electric double-layer capacitor, the energy storage capacity of the highest conducting sample was investigated. All decisive parameters of the EDLC were determined. At the first cycle, the specific capacitance, internal resistance, energy density, and power density were found to be 130 F/g, 80 Ω, 14.5 Wh/kg, and 1100 W/kg, respectively.
Highlights
The use of environmentally friendly electrolytes is one of the hot topics in secondary lithium batteries studies
The dielectric properties and relaxation dynamics of polymer electrolytes based on poly(vinyl alcohol) (PVA):CS:LiClO4 plasticized with glycerol have been analyzed for the first time
In order to calculate the decisive parameters of the Electrochemical double-layer capacitor (EDLC), such as equivalent series resistance (Res ), specific capacitance from charge–discharge (CCD ), energy (E), and power density (P), the current density was kept at 0.5 mA/cm2
Summary
The use of environmentally friendly electrolytes is one of the hot topics in secondary lithium batteries studies. Natural SPEs—mainly starch, cellulose, chitosan (CS), carrageenan, and agarose—have recently drawn significant attention This is because of their potential uses in electrochemical devices, such as electrochromic devices, high energy density batteries, sensors, EDLC, and fuel cells [9,10,11]. The analysis of ionic conductivity of polymer electrolytes via dielectric properties provides insight into the eligibility of polymer of interest in large scale It is well-known that the study of dielectric relaxation phenomena leads to understanding ion transport mechanisms, including the extent of ionic/molecular interaction in SPE systems [35]. The highest conducting electrolyte was employed in the fabrication of EDLCs. In the current work, the dielectric properties and relaxation dynamics of polymer electrolytes based on PVA:CS:LiClO4 plasticized with glycerol have been analyzed for the first time. The dielectric and electrical modulus properties of plasticized polymer electrolyte PVA:CS:LiClO4 and its energy storage capacity (i.e., electric double-layer capacitor) have been studied
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