Innovative Methylcellulose-Polyvinyl Pyrrolidone-Based Solid Polymer Electrolytes Impregnated with Potassium Salt: Ion Conduction and Thermal Properties

Abstract

In this research, innovative green and sustainable solid polymer electrolytes (SPEs) based on plasticized methylcellulose/polyvinyl pyrrolidone/potassium carbonate (MC/PVP/K2CO3) were examined. The MC/PVP/K2CO3 SPE system with five distinct ethylene carbonate (EC) concentrations as a plasticizer was successfully designed. Frequency-dependent conductivity plots were used to investigate the conduction mechanism of the SPEs. Electrochemical potential window stability and the cation transfer number of the SPEs were studied via linear sweep voltammetry (LSV) and transference number measurement (TNM), respectively. Additionally, the structural behavior of the SPEs was analyzed using Fourier transform infrared spectroscopy (FTIR), field emission scanning electron microscopy (FESEM), X-ray diffractometry (XRD), and differential scanning calorimetry (DSC) techniques. The SPE film complexed with 15 wt.% EC measured a maximum conductivity of 3.88 × 10−4 Scm−1. According to the results of the transference number examination, cations that record a transference number of 0.949 are the primary charge carriers. An EDLC was fabricated based on the highest conducting sample that recorded a specific capacitance of 54.936 Fg−1 at 5 mVs−1.

Insight into the Effect of Glycerol on Dielectric Relaxation and Transport Properties of Potassium-Ion-Conducting Solid Biopolymer Electrolytes for Application in Solid-State Electrochemical Double-Layer Capacitor

“…The complicated impedance measurements were used to estimate the conductivity values of the mixtures of MC and PC in varied proportions, according to the complex impedance (Z r and Z i ) plot shown in Figure S1. The ionic conductivity of each sample was determined using Equation (2) [18]:…”

“…Methylcellulose (MC) is a common biopolymer synthesized by substituting the OH groups of cellulose with methyl groups [17][18][19]. Thus, MC contains multiple hydrophobic methoxy groups connected to its hydrophilic polysaccharide backbone.…”

“…A glycerol plasticizer was added to the SBE to increase the system's conductivity and potential stability. The major purpose of ultrasonic treatment is to completely homogenize the precursor solution and enhance the miscibility of the PC/MC blend with K 3 PO 4 , and glycerol as ultrasonication is often used to ensure the complete dissociation of salt clusters inside the precursor solution [18]. Electrochemical tests on the samples were carried out utilizing complex impedance spectroscopy, linear sweep voltammetry, and transference number measurement.…”

Optimization of the glass transition temperature of polyvinyl pyrrolidone/polyacrylamide blend films using response surface methodology

“…The amorphousness and carbonyl functional groups (C O) in the side chains of PVP facilitate segmental mobility and complexation with various inorganic salts, respectively. 11 When complexed with Na, and MgSO 4 Á7H 2 O salts at room temperature, the pristine PVP-based electrolytes demonstrated a conductivity of 1.02 Â 10 À9 S/cm. 12 The poor ionic conductivity of pristine PVP-based electrolytes is related to the structural stiffness and higher T g value of the polymer, reducing the flexibility and segmental mobility of the system at room temperature.…”

“…PVP is one of the various polymeric materials being researched as polymeric hosts for electrolyte preparations. The amorphousness and carbonyl functional groups (CO) in the side chains of PVP facilitate segmental mobility and complexation with various inorganic salts, respectively 11 . When complexed with Na, and MgSO 4 ·7H 2 O salts at room temperature, the pristine PVP‐based electrolytes demonstrated a conductivity of 1.02 × 10 −9 S/cm 12 .…”