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<p>A series of potassium ion-conducting nanocomposite polymer electrolytes was fabricated using the solvent casting method, employing poly(ethyl methacrylate) (PEMA) as the polymer matrix, potassium thiocyanate (KSCN) as the electrolyte, and nano-titanium oxide (TiO₂, size ~ 28&#xa0;nm) as the filler. The interaction between PEMA, KSCN, and TiO₂ was confirmed through X-ray diffraction (XRD) analysis, indicating the successful incorporation of the filler into the polymer-salt matrix. Differential Scanning Calorimetric (DSC) analysis further validated these interactions by revealing thermal transitions. The PEMA/KSCN/4 wt% TiO₂ composite exhibited a lower glass transition temperature (T<sub>g</sub>) compared to pure PEMA, highlighting the plasticizing effect of KSCN and TiO₂ on the polymer matrix. The PEMA/KSCN/4 wt% TiO₂ composite showed the highest ionic conductivity of 6.504 × 10⁻⁵ Scm⁻¹ at room temperature, a value 10<sup>2</sup> times greater than that of the PEMA/KSCN system. The diffusion coefficient, ionic mobility, and ion concentration were determined and revealing substantial improvements in the ion transport properties of the prepared system. Scanning Electron Microscopy (SEM) images revealed significant changes in the surface morphology, indicating effective dispersion of TiO₂ nanoparticles within the polymer matrix. This study highlights the enhancement of ionic conductivity, thermal transitions, and microstructural characteristics in potassium ion-conducting nanocomposite polymer electrolytes with the incorporation of nano-TiO₂. The study also demonstrated the suitability of the PEMA/KSCN/4 wt% TiO₂ composite as an electrolyte for primary battery applications, achieving an open circuit voltage (OCV) of 1.38&#xa0;V and sustaining a stable discharge voltage of 1.02&#xa0;V under a 1 MΩ load for over 50&#xa0;h.</p>

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Unveiling conductivity, dielectric, morphological and thermal properties of PEMA-KSCN electrolytes doped with Nano-TiO₂

  • 期刊论文

  • 发表日期：

    2025年6月25日

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  • M. Ulaganathan,
  • S. Jayanthi

摘要

A series of potassium ion-conducting nanocomposite polymer electrolytes was fabricated using the solvent casting method, employing poly(ethyl methacrylate) (PEMA) as the polymer matrix, potassium thiocyanate (KSCN) as the electrolyte, and nano-titanium oxide (TiO₂, size ~ 28 nm) as the filler. The interaction between PEMA, KSCN, and TiO₂ was confirmed through X-ray diffraction (XRD) analysis, indicating the successful incorporation of the filler into the polymer-salt matrix. Differential Scanning Calorimetric (DSC) analysis further validated these interactions by revealing thermal transitions. The PEMA/KSCN/4 wt% TiO₂ composite exhibited a lower glass transition temperature (Tg) compared to pure PEMA, highlighting the plasticizing effect of KSCN and TiO₂ on the polymer matrix. The PEMA/KSCN/4 wt% TiO₂ composite showed the highest ionic conductivity of 6.504 × 10⁻⁵ Scm⁻¹ at room temperature, a value 102 times greater than that of the PEMA/KSCN system. The diffusion coefficient, ionic mobility, and ion concentration were determined and revealing substantial improvements in the ion transport properties of the prepared system. Scanning Electron Microscopy (SEM) images revealed significant changes in the surface morphology, indicating effective dispersion of TiO₂ nanoparticles within the polymer matrix. This study highlights the enhancement of ionic conductivity, thermal transitions, and microstructural characteristics in potassium ion-conducting nanocomposite polymer electrolytes with the incorporation of nano-TiO₂. The study also demonstrated the suitability of the PEMA/KSCN/4 wt% TiO₂ composite as an electrolyte for primary battery applications, achieving an open circuit voltage (OCV) of 1.38 V and sustaining a stable discharge voltage of 1.02 V under a 1 MΩ load for over 50 h.