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<p>The structural, electrical, and optical characteristics of biopolymer electrolytes are derived from tamarind seed polysaccharide (TSP) and doped with sodium iodide (NaI) at various concentrations. TSP is highlighted as a biodegradable, renewable, nontoxic biopolymer with excellent film-forming ability, thermal stability, and functional groups that facilitate effective salt dissociation and ion transport. This justification aligns the material choice with the sustainability and performance objectives of the study. The films were fabricated by employing the solution casting method utilizing TSP:NaI ratios of 100:00, 90:10, 80:20, and 70:30. x-Ray diffraction analysis substantiated the presence of a predominantly amorphous structure in the 80:20 composite, which facilitated enhanced ionic mobility. Alternating-current (AC) impedance spectroscopy demonstrated the highest ionic conductivity (4.27 × 10<sup>−6</sup> S cm<sup>−1</sup>) for this high composition. Investigations of dielectric properties and tangent loss illustrated significant energy storage capabilities along with minimal energy dissipation within the same composition. Optical evaluations revealed the peak absorbance, extinction coefficient, and refractive index, indicating its potential applicability in UV-blocking technologies. The optical bandgap exhibited a decrease with the increase in NaI concentration. The conductance and absorption coefficients further corroborated this improvement. Moreover, the membrane exhibited consistent electrochemical performance in sodium-ion battery discharge assessments, maintaining a plateau voltage of 1.52&#xa0;V over 21&#xa0;h.</p>

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Unveiling the Dielectric Response, Energy Bandgap, and Discharge Studies of Na+ Ion Biopolymer Electrolytes from TSP

  • 期刊论文

  • 发表日期：

    2026年4月30日

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  • M. Keerti,
  • M. Gnana Kiran,
  • P. S. V. Nandini,
  • Shaik Babu,
  • N. Krishna Jyothi,
  • P. V. Raja Shekar,
  • M. C. Rao,
  • Nageswara Rao Medikondu,
  • K. Swapna,
  • A. Venkateswara Rao

摘要

The structural, electrical, and optical characteristics of biopolymer electrolytes are derived from tamarind seed polysaccharide (TSP) and doped with sodium iodide (NaI) at various concentrations. TSP is highlighted as a biodegradable, renewable, nontoxic biopolymer with excellent film-forming ability, thermal stability, and functional groups that facilitate effective salt dissociation and ion transport. This justification aligns the material choice with the sustainability and performance objectives of the study. The films were fabricated by employing the solution casting method utilizing TSP:NaI ratios of 100:00, 90:10, 80:20, and 70:30. x-Ray diffraction analysis substantiated the presence of a predominantly amorphous structure in the 80:20 composite, which facilitated enhanced ionic mobility. Alternating-current (AC) impedance spectroscopy demonstrated the highest ionic conductivity (4.27 × 10−6 S cm−1) for this high composition. Investigations of dielectric properties and tangent loss illustrated significant energy storage capabilities along with minimal energy dissipation within the same composition. Optical evaluations revealed the peak absorbance, extinction coefficient, and refractive index, indicating its potential applicability in UV-blocking technologies. The optical bandgap exhibited a decrease with the increase in NaI concentration. The conductance and absorption coefficients further corroborated this improvement. Moreover, the membrane exhibited consistent electrochemical performance in sodium-ion battery discharge assessments, maintaining a plateau voltage of 1.52 V over 21 h.