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<p>Solid polymer electrolytes based on chitosan: methyl cellulose (CS: MC) blends doped with ammonium nitrate (NH₄NO₃) were systematically developed to investigate the influence of polymer blend ratio on structural and electrochemical properties. Polymer electrolyte films were prepared via solution casting with a fixed NH₄NO₃ concentration of 35 wt% while varying the CS: MC ratios (70:30, 60:40, 50:50, 40:60 and 30:70). Electrochemical impedance spectroscopy revealed a strong dependence of bulk resistance and ionic conductivity on blend composition, with the CS: MC (60:40) sample exhibiting the lowest bulk resistance and the highest room-temperature ionic conductivity of 2.51 × 10<sup>− 5</sup> S·cm<sup>− 1</sup>. Dielectric, modulus, and AC conductivity analyses confirmed enhanced ion mobility, reduced polarization resistance, and faster relaxation dynamics at this optimized ratio. X-ray diffraction combined with Gaussian peak deconvolution showed that the 60:40 blend possessed the lowest degree of crystallinity (21.4%), indicating a predominantly amorphous structure favorable for ion transport. FTIR analysis further confirmed enhanced polymer–salt interactions and effective nitrate ion dissociation at the optimal composition. The strong correlation between reduced crystallinity, enhanced segmental motion, and improved ionic transport demonstrates that polymer blend ratio is a key parameter governing the electrochemical performance of CS: MC electrolytes. These findings highlight the potential of chitosan-based biopolymer blend electrolytes for solid-state electrochemical energy storage applications.</p>

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Optimization of polymer blend ratio for high performance chitosan: methyl cellulose-NH4NO3 solid polymer electrolytes

  • 期刊论文

  • 发表日期：

    2026年5月23日

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  • Safar Saeed Mohammed,
  • Ahmed Hassan Ahmed,
  • Asyar Ahmed Mohammad Amin,
  • Shujahadeen Bakr Aziz,
  • Blnd hassan Mohammednajm,
  • Rezhaw Abdalla Qadir

摘要

Solid polymer electrolytes based on chitosan: methyl cellulose (CS: MC) blends doped with ammonium nitrate (NH₄NO₃) were systematically developed to investigate the influence of polymer blend ratio on structural and electrochemical properties. Polymer electrolyte films were prepared via solution casting with a fixed NH₄NO₃ concentration of 35 wt% while varying the CS: MC ratios (70:30, 60:40, 50:50, 40:60 and 30:70). Electrochemical impedance spectroscopy revealed a strong dependence of bulk resistance and ionic conductivity on blend composition, with the CS: MC (60:40) sample exhibiting the lowest bulk resistance and the highest room-temperature ionic conductivity of 2.51 × 10− 5 S·cm− 1. Dielectric, modulus, and AC conductivity analyses confirmed enhanced ion mobility, reduced polarization resistance, and faster relaxation dynamics at this optimized ratio. X-ray diffraction combined with Gaussian peak deconvolution showed that the 60:40 blend possessed the lowest degree of crystallinity (21.4%), indicating a predominantly amorphous structure favorable for ion transport. FTIR analysis further confirmed enhanced polymer–salt interactions and effective nitrate ion dissociation at the optimal composition. The strong correlation between reduced crystallinity, enhanced segmental motion, and improved ionic transport demonstrates that polymer blend ratio is a key parameter governing the electrochemical performance of CS: MC electrolytes. These findings highlight the potential of chitosan-based biopolymer blend electrolytes for solid-state electrochemical energy storage applications.