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<p>High-performance solid polymer electrolytes (SPEs) are needed for safe, low-cost energy storage. This study develops a chitosan (CS)–poly(vinyl alcohol) (PVA) blend SPE complexed with sodium thiocyanate (NaSCN) and supplemented with Al<sub>2</sub>O<sub>3</sub> nanoparticles, plasticized by glycerol (10–50&#xa0;wt%). Free-standing films were prepared by solution casting and characterized to elucidate glycerol’s role in structure–transport relationships. X-ray diffraction indicates a predominantly amorphous matrix with a linear decrease in crystallinity from 23.63% (EY1) to 15.29% (EY5). FTIR spectroscopy evidences hydrogen bonding between glycerol and polymer chains and enhanced salt–polymer complexation. Electrochemical impedance spectroscopy shows a drop in bulk resistance from 217.69&#xa0;kΩ (EY1) to 0.994&#xa0;kΩ (EY5), and a rise in DC conductivity from 0.0215 to 7.0771&#xa0;µS&#xa0;cm<sup>−1</sup> (≈329-fold). Glycerol also accelerates ion dynamics, reducing the relaxation time from 4.849 to 1.892&#xa0;µs and promoting faster dielectric relaxation. The combined effects of glycerol-induced plasticization and nanoparticle-assisted complexation yield flexible, highly amorphous membranes with improved ionic transport. These results identify CS/PVA–NaSCN–Al<sub>2</sub>O<sub>3</sub>–glycerol films as cost-effective, processable SPEs with promising characteristics for sustainable energy storage applications.</p>

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Molecular-level insights into glycerol-assisted ion transport and dielectric behavior of CS–PVA–NaSCN–Al2O3 polymer electrolytes

  • 期刊论文

  • 发表日期：

    2025年11月24日

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  • Karukh Ali Babakr,
  • Ibrahim Nazem Qader,
  • Hazhar Hamad Rasul,
  • Shujahadeen Bakr Aziz,
  • Safar Saeed Mohammed,
  • Dlshad Aziz Hamid,
  • Ibrahim Luqman Salih,
  • Peshawa Hassan Mahmood,
  • Pshdar Ahmed Ibrahim,
  • Abubakr Wsu Muhammed,
  • Bala Talib Ali,
  • Peyman Aspoukeh,
  • Hossein Khojasteh,
  • Samir Mustafa Hamad

摘要

High-performance solid polymer electrolytes (SPEs) are needed for safe, low-cost energy storage. This study develops a chitosan (CS)–poly(vinyl alcohol) (PVA) blend SPE complexed with sodium thiocyanate (NaSCN) and supplemented with Al2O3 nanoparticles, plasticized by glycerol (10–50 wt%). Free-standing films were prepared by solution casting and characterized to elucidate glycerol’s role in structure–transport relationships. X-ray diffraction indicates a predominantly amorphous matrix with a linear decrease in crystallinity from 23.63% (EY1) to 15.29% (EY5). FTIR spectroscopy evidences hydrogen bonding between glycerol and polymer chains and enhanced salt–polymer complexation. Electrochemical impedance spectroscopy shows a drop in bulk resistance from 217.69 kΩ (EY1) to 0.994 kΩ (EY5), and a rise in DC conductivity from 0.0215 to 7.0771 µS cm−1 (≈329-fold). Glycerol also accelerates ion dynamics, reducing the relaxation time from 4.849 to 1.892 µs and promoting faster dielectric relaxation. The combined effects of glycerol-induced plasticization and nanoparticle-assisted complexation yield flexible, highly amorphous membranes with improved ionic transport. These results identify CS/PVA–NaSCN–Al2O3–glycerol films as cost-effective, processable SPEs with promising characteristics for sustainable energy storage applications.