Investigation of ion transport in plasticized polymer electrolytes using electrical equivalent circuit (EEC) modeling

In this study, biopolymer-based solid polymer blend electrolyte (SPBE) films were created from chitosan (CS), poly(2-ethyl-2-oxazoline) (POZ), potassium iodide (KI), and glycerol (GL) using solvent casting. The effect of GL as a plasticizer on the electrical properties of materials was investigated...

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Bibliographic Details
Published in:Journal of materials science. Materials in electronics 2024-04, Vol.35 (11), p.777, Article 777
Main Author: Abdullah, Ranjdar M.
Format: Article
Language:English
Subjects:
Biopolymers
Bulk density
Carrier mobility
Characterization and Evaluation of Materials
Charge density
Chemistry and Materials Science
Chitosan
Current carriers
Dielectric loss
Dielectric properties
Electrical properties
Electrochemical impedance spectroscopy
Electrode polarization
Electrodes
Electrolytes
Equivalent circuits
Flexible components
Ion currents
Ion transport
Low frequencies
Material properties
Materials Science
Optical and Electronic Materials
Polyethylenes
Polyethyloxazoline
Polymer blends
Polymers
Potassium iodides
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Summary:In this study, biopolymer-based solid polymer blend electrolyte (SPBE) films were created from chitosan (CS), poly(2-ethyl-2-oxazoline) (POZ), potassium iodide (KI), and glycerol (GL) using solvent casting. The effect of GL as a plasticizer on the electrical properties of materials was investigated using electrochemical impedance spectroscopy. GL significantly increased dopant salt dissociation, increasing mobile charge density and decreasing bulk resistance ( R b ). This increased ionic conductivity and ion transport in the polymer electrolyte (PE) system, with the samples containing the most GL exhibiting the highest conductivity (3.96 × 10 –4 S/cm). Electrochemical impedance plots revealed distinct conductivity characteristics at electrode interfaces due to double-layer capacitances. Electrical Equivalent Circuit (EEC) analysis was utilized to interpret impedance measurements, revealing improved ion transport after EEC fitting. The theoretical and practical significance of transport parameters derived from the impedance plots was demonstrated. The dielectric properties of PE films were analyzed to gain insight into electrolyte ion conduction and polarization. GL increased dielectric constant ( ε ′ ) and dielectric loss ( ε ′ ′ ) values at low frequencies, thereby enhancing dielectric properties and conductivity through an increase in the number of mobile ions. However, excessive GL diminished dielectric properties due to ion aggregation. Increased loss tangent ( tan δ ) peaks in PE films revealed the impact of GL on charge carrier mobility and resistivity. PE films exhibited negligible real electrical modulus ( M ′ ) at low frequencies in the absence of electrode polarization (EP), while imaginary part of the electrical modulus ( M ′ ′ ) demonstrated a loss peak indicating substantial relaxation. GL incorporation altered relaxation dynamics, which may have implications for particular applications. The study also cast light on the dynamics of material relaxation, which may be pertinent to various applications particularly in flexible electronics.
ISSN:0957-4522
1573-482X
DOI:10.1007/s10854-024-12564-x