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Konjac glucomannan derived biodegradable superionic solid-state electrolyte films for devising economically viable

Sushant Wakekar1, Laxmi Pasupuleti1, Bapan Jana2

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Biodegradable konjac glucomannan (KG) and sodium iodide (NaI) films were synthesized for solid-state electrolytes. The best-performing KG-NaI film offers high conductivity and stability for flexible energy storage devices.

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Polymer Science

Background:

  • Solid-state electrolytes are crucial for advanced energy storage devices.
  • Developing biodegradable and cost-effective electrolyte materials remains a significant challenge.
  • Konjac glucomannan (KG) offers a sustainable and abundant biopolymer platform.

Purpose of the Study:

  • To synthesize and characterize biodegradable solid-state electrolyte films.
  • To investigate the electrochemical properties of KG-NaI composites.
  • To evaluate the performance of these electrolytes in flexible supercapacitors.

Main Methods:

  • Synthesis of konjac glucomannan (KG) and sodium iodide (NaI) composite films (KGNaI-x, x = 31-69 wt%).
  • Characterization of film flexibility, biodegradability, and ionic conductivity.
  • Fabrication and electrochemical testing of supercapacitors using the optimized KGNaI-69 electrolyte.

Main Results:

  • The KGNaI-69 film demonstrated excellent flexibility and biodegradability.
  • Achieved a high sodium superionic conductivity of 77.9 mS cm-1.
  • The supercapacitor exhibited outstanding electrochemical efficiency and retained 84.4% capacitance after 5000 cycles.

Conclusions:

  • Biodegradable KG-NaI composite films are promising solid-state electrolytes.
  • The KGNaI-69 electrolyte enables high-performance flexible supercapacitors.
  • This work highlights the potential of biopolymer-based electrolytes for sustainable energy storage.