A solid polymer electrolyte (SPE) film with improved mechanical and thermal stability has drawn significant attention in the field of polymer research due to their technological applications in energy storage devices. We have explored the electrical properties of the blend SPE composed of 20 wt. % poly(ethylene oxide), 80 wt. % polyvinylidene fluoride, and 35 wt. % NH₄I by introducing a plasticizer ethylene carbonate (EC). A significant enhancement of electrical conductivity has been found in the composite SPE containing 80 wt. % of EC. We have confirmed the formation of a hydrogen bonding network between the carbonyl group (C=O) of EC and the cations ${\mathrm{N}\mathrm{H}}_4^{+}$. Therefore, EC facilitates the new coordination sites via the hydrogen bonding network with the cations ${\mathrm{N}\mathrm{H}}_4^{+}$, which eventually leads to the enhancement of conductivity up to a maximum value of 1.2 × 10⁻⁴ S/cm at 80 wt. % of EC. The increase in the relative percentage of contact ions over free ions at 80% of EC, as estimated from the FTIR study, is thus intriguing. Therefore, we have proposed an ion transport mechanism based on ion hopping through different coordinating sites mediated by EC. Dielectric relaxation of the composite SPE has been best delineated by a two-parameter Mittag-Leffler function. The exponents obtained from the fit of the experimental decay function with the two-parameter Mittag-Leffler function in the entire time domain are positive and less than one, suggesting non-Debye relaxation in the polymer composite system under investigation.

中文翻译：

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增塑剂碳酸亚乙酯促进共混聚合物电解质中新的离子配位位点：通过两参数Mittag-Leffler函数介电弛豫

由于其在储能装置中的技术应用，具有改善的机械和热稳定性的固体聚合物电解质（SPE）膜在聚合物研究领域引起了极大的关注。我们已经探索了由20 wt。％聚环氧乙烷，80 wt。重量的聚偏二氟乙烯，和35重量％。％的NH ₄我通过引入增塑剂的碳酸亚乙酯（EC）。已经发现在包含80wt。％的SPE的复合SPE中，电导率显着提高。EC的百分比。我们已经确认了EC的羰基（C = O）与阳离子之间形成了氢键网络${\mathrm{ñ}\mathrm{H}}_4^{+}$。因此，EC通过与阳离子的氢键网络促进了新的配位点${\mathrm{ñ}\mathrm{H}}_4^{+}$最终导致电导率的提高，在80 wt。％时最大值达到1.2×10 ^-4 S / cm。EC的百分比。根据FTIR研究估计，在EC为80％的情况下，接触离子相对于游离离子的相对百分比的增加令人着迷。因此，我们提出了一种基于通过EC介导的不同配位位点进行离子跳跃的离子传输机制。复合SPE的介电弛豫最好用两参数Mittag-Leffler函数来描述。在整个时域中，从实验衰减函数与两参数Mittag-Leffler函数的拟合中获得的指数为正且小于1，这表明所研究的聚合物复合体系中的非德拜弛豫。