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<p>Solid polymer-blend electrolyte (SPE) films were prepared by blending two polymers, namely polyethylene oxide (PEO) and polyvinylidene fluoride–hexafluoropropylene (PVDF-HFP), and complexing them with sodium hexafluorophosphate (NaPF<sub>6</sub>). This resulted in a mixture referred to as 70PEO:30PVDF-HFP + <i>x</i> wt.% NaPF<sub>6</sub> (where <i>x</i> = 1, 3 5, 7, 9). Studies were conducted to investigate the impact of varying the salt NaPF<sub>6</sub> weight percentage on the optimization of ionic conductivity and the structural and dielectric properties. The alternating current (AC) conductivity, impedance, dielectric behavior, and electric modulus were investigated using electrochemical impedance spectroscopy (EIS), operating between 1&#xa0;Hz and 4&#xa0;MHz. At high frequencies, the AC conductivity of the SPE films follows the Jonscher power law. The ionic conductivity of direct current (DC) was determined using two different techniques. The first method involved finding the perfect fitting of the Jonscher universal power law to the AC conductivity scale, while the second method used the bulk resistance (<i>R</i><sub>b</sub>) of the SPE film to compute the value. The values estimated by the two approaches were almost the same. Up to 7 wt.%, the DC ionic conductivity increased with increasing salt weight percentage, after which it decreased as the salt concentration was further increased. The Arrhenius rule governs the temperature-dependent ionic conductivity between 298&#xa0;K and 333&#xa0;K. At 298&#xa0;K, the blend matrix 70PEO:30PVDF-HFP with 7wt.% NaPF<sub>6</sub> demonstrated the highest ionic conductivity of 4.24 × 10<sup>−6</sup> S/cm.</p>

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Exploring the Impact of NaPF6 Concentration on the Optimization of Ionic Conductivity, Structural and Dielectric Properties of PEO + PVDF-HFP Polymer Blend Electrolytes

  • 期刊论文

  • 发表日期：

    2025年4月23日

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  • I S Ravi Varma,
  • Venkata Ramana Jeedi,
  • Kiran Kumar Ganta,
  • S. Ramesh

摘要

Solid polymer-blend electrolyte (SPE) films were prepared by blending two polymers, namely polyethylene oxide (PEO) and polyvinylidene fluoride–hexafluoropropylene (PVDF-HFP), and complexing them with sodium hexafluorophosphate (NaPF6). This resulted in a mixture referred to as 70PEO:30PVDF-HFP + x wt.% NaPF6 (where x = 1, 3 5, 7, 9). Studies were conducted to investigate the impact of varying the salt NaPF6 weight percentage on the optimization of ionic conductivity and the structural and dielectric properties. The alternating current (AC) conductivity, impedance, dielectric behavior, and electric modulus were investigated using electrochemical impedance spectroscopy (EIS), operating between 1 Hz and 4 MHz. At high frequencies, the AC conductivity of the SPE films follows the Jonscher power law. The ionic conductivity of direct current (DC) was determined using two different techniques. The first method involved finding the perfect fitting of the Jonscher universal power law to the AC conductivity scale, while the second method used the bulk resistance (Rb) of the SPE film to compute the value. The values estimated by the two approaches were almost the same. Up to 7 wt.%, the DC ionic conductivity increased with increasing salt weight percentage, after which it decreased as the salt concentration was further increased. The Arrhenius rule governs the temperature-dependent ionic conductivity between 298 K and 333 K. At 298 K, the blend matrix 70PEO:30PVDF-HFP with 7wt.% NaPF6 demonstrated the highest ionic conductivity of 4.24 × 10−6 S/cm.