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Lignin-Based Gel Polymer Electrolyte for Cationic Conductivity.

Nabi S Shabanov1,2, Kamil Sh Rabadanov1, Malik M Gafurov1

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Researchers developed a novel gel-polymer electrolyte from modified lignin, achieving high cationic conductivity and lithium ion transport. This sustainable biopolymer electrolyte shows promise for advanced electrochemical applications.

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bio-sourced materialsgel polymer electrolyteslithium cation transfer

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Area of Science:

  • Materials Science
  • Polymer Chemistry
  • Electrochemistry

Background:

  • Lignin, a natural biopolymer from *Pinus sylvestris*, is an abundant and renewable resource.
  • Developing sustainable electrolytes is crucial for next-generation energy storage devices.
  • Existing electrolytes often face limitations in conductivity and ion transport.

Purpose of the Study:

  • To prepare and characterize a gel-polymer electrolyte (GPE) using chemically modified lignin.
  • To investigate the ionic conductivity and ion transport mechanisms within the lignin-based GPE.
  • To evaluate the potential of this novel biopolymer electrolyte for electrochemical applications.

Main Methods:

  • Sulfonation and chlorination of lignin to enable mono-ionic conductivity.
  • Synthesis of a composite gel-polymer electrolyte with polyvinyl alcohol.
  • Impedance spectroscopy to determine electronic characteristics and conductivity.
  • Qualitative and quantitative analysis, including quantum-chemical calculations.

Main Results:

  • Successfully synthesized a lignin-based GPE with predominantly cationic conductivity.
  • Achieved a specific volume conductivity of 2.48 × 10-4 S cm-1.
  • Attained a record lithium cation transference number (tLi+) of 0.89.
  • Established correlations between chemical modification, GPE structure, and ionic conductivity.

Conclusions:

  • Chemically modified lignin can serve as a viable matrix for high-performance gel-polymer electrolytes.
  • The developed GPE exhibits competitive conductivity and superior lithium ion transport.
  • This research offers insights into tailoring biopolymer electrolytes for enhanced electrochemical performance.