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<p>This study investigates the impact of ethylene carbonate (EC) as a plasticizer in poly(ethylene oxide) (PEO) and poly(vinylidene fluoride-co-hexafluoropropylene) (PVDF-HFP) polymer blend electrolytes doped with sodium hexafluorophosphate (NaPF<sub>6</sub>). Using solution casting technique, polymer electrolyte membranes with varying EC concentrations (0–10 wt%) were synthesized and characterized through XRD, FTIR, DSC, SEM, impedance spectroscopy, and dielectric analysis. Key findings reveal that an 8 wt% EC composition optimally balances amorphization and structural integrity, achieving a maximum ionic conductivity of 1.49 × 10<sup>−4</sup> S/cm at room temperature. This enhancement is attributed to reduced crystallinity, increased segmental motion, and improved ion dissociation. Morphological studies confirm reduced phase separation and improved homogeneity at the optimal EC concentration. structural and electric and dielectric analyses highlight the superior ionic mobility, reduced activation energy, and extended DC conductivity plateau for the 8% EC system, underscoring its suitability for advanced energy applications.</p>

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Enhanced ionic conductivity in sodium-ion polymer electrolytes: The role of ethylene carbonate in optimizing NaPF6 based PEO:PVDF-HFP polymer electrolytes

  • 期刊论文

  • 发表日期：

    2025年4月24日

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  • I S Ravi Varma,
  • Venkata Ramana Jeedi,
  • Kiran Kumar Ganta,
  • Rayudu Katuri,
  • N Kundana,
  • G Upender,
  • Ch Venkata Koti Reddy,
  • V. Suryanarayana,
  • S. Ramesh

摘要

This study investigates the impact of ethylene carbonate (EC) as a plasticizer in poly(ethylene oxide) (PEO) and poly(vinylidene fluoride-co-hexafluoropropylene) (PVDF-HFP) polymer blend electrolytes doped with sodium hexafluorophosphate (NaPF6). Using solution casting technique, polymer electrolyte membranes with varying EC concentrations (0–10 wt%) were synthesized and characterized through XRD, FTIR, DSC, SEM, impedance spectroscopy, and dielectric analysis. Key findings reveal that an 8 wt% EC composition optimally balances amorphization and structural integrity, achieving a maximum ionic conductivity of 1.49 × 10−4 S/cm at room temperature. This enhancement is attributed to reduced crystallinity, increased segmental motion, and improved ion dissociation. Morphological studies confirm reduced phase separation and improved homogeneity at the optimal EC concentration. structural and electric and dielectric analyses highlight the superior ionic mobility, reduced activation energy, and extended DC conductivity plateau for the 8% EC system, underscoring its suitability for advanced energy applications.