Investigation of structural, dielectric, and AC conductivity response in potassium-based polymer electrolytes: Tailoring PEO-PVDF blends for enhanced performance

IF 3.3 4区材料科学 Q3 CHEMISTRY, PHYSICAL Solid State Ionics Pub Date : 2025-04-01 Epub Date: 2025-02-26 DOI:10.1016/j.ssi.2025.116811

Venkata Ramana Jeedi , Kiran Kumar Ganta , Rayudu Katuri , N. Kundana , Malla Reddy Yalla , Anji Reddy Polu , Firdaus Mohamad Hamzah

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Abstract

Polymer electrolyte membranes comprising Poly(ethylene Oxide) and Poly(vinylidene Fluoride) blends complexed with KNO₃ were developed using the solution casting technique by varying the polymers. These systems were extensively characterized through X-Ray Diffractogram, Fourier Transform Infrared, and SEM to analyze their complexation behavior, functional groups, and morphology. The ionic conductivity and electrical characteristics were investigated via impedance spectroscopy over a frequency up to 10 MHz. Dielectric properties, including the dielectric constant (ε'), dielectric loss (ε"), relaxation time (τ), and modulus (M' and M"), were also examined. The AC conductivity profile revealed a frequency-independent plateau, indicating ion migration as the primary contributor to conductivity. The 80PEO:20PVDF composition exhibited the highest ionic conductivity (1.60 × 10⁻⁴ S.cm⁻¹) and the least activation energy, attributed to efficient ion dissociation and structural reorganization due to the interactions between PEO and PVDF molecules.

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钾基聚合物电解质的结构、介电和交流电导率响应研究：为增强性能而定制PEO-PVDF共混物

采用溶液浇铸技术，通过改变聚合物，制备了由聚环氧乙烷和聚偏氟乙烯共混物与KNO3络合组成的聚合物电解质膜。通过x射线衍射图、傅里叶红外变换和扫描电镜对这些体系进行了广泛的表征，分析了它们的络合行为、官能团和形态。通过阻抗谱在10 MHz频率上研究了离子电导率和电学特性。介质性能包括介电常数（ε′）、介电损耗（ε′）、弛豫时间（τ）和模量（M′和M′）。交流电导率谱显示了一个与频率无关的平台，表明离子迁移是电导率的主要贡献者。80PEO:20PVDF表现出最高的离子电导率（1.60 × 10−4 S.cm−1）和最低的活化能，这是由于PEO和PVDF分子之间的相互作用导致的有效的离子解离和结构重组。

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来源期刊

Solid State Ionics 物理-物理：凝聚态物理

CiteScore

6.10

自引率

3.10%

发文量

152

审稿时长

58 days

期刊介绍： This interdisciplinary journal is devoted to the physics, chemistry and materials science of diffusion, mass transport, and reactivity of solids. The major part of each issue is devoted to articles on: (i) physics and chemistry of defects in solids; (ii) reactions in and on solids, e.g. intercalation, corrosion, oxidation, sintering; (iii) ion transport measurements, mechanisms and theory; (iv) solid state electrochemistry; (v) ionically-electronically mixed conducting solids. Related technological applications are also included, provided their characteristics are interpreted in terms of the basic solid state properties. Review papers and relevant symposium proceedings are welcome.