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Compatible Solid Polymer Electrolyte Based on Methyl Cellulose for Energy Storage Application: Structural,

Shujahadeen B Aziz1,2, Iver Brevik3, Muhamad H Hamsan4

  • 1Hameed majid Advanced Polymeric Materials Research Lab., Physics, College of Science, University of Sulaimani, Qlyasan Street, Sulaimani 46001, Kurdistan Regional Government, Iraq.

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|October 6, 2020
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Summary

Green polymer electrolytes using methyl cellulose (MC) and sodium iodide (NaI) show promising results for electrochemical double-layer capacitors (EDLCs). These electrolytes exhibit good ionic conductivity and stability, making them suitable for energy storage applications.

Keywords:
XRD studyenergy storage devicegreen polymer electrolytesimpedance analysissodium salt

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Polymer Science

Background:

  • Development of sustainable and efficient electrolytes is crucial for advanced energy storage devices.
  • Methyl cellulose (MC) offers a biodegradable and biocompatible base for polymer electrolytes.
  • Electrochemical double-layer capacitors (EDLCs) require electrolytes with high ionic conductivity and stability.

Purpose of the Study:

  • To prepare and characterize green polymer electrolytes based on methyl cellulose for EDLC applications.
  • To investigate the structural, electrical, and electrochemical properties of MC-NaI polymer electrolytes.
  • To evaluate the performance of these electrolytes in an EDLC device.

Main Methods:

  • Preparation of solid polymer electrolytes (SPEs) by incorporating varying concentrations of sodium iodide (NaI) into a methyl cellulose (MC) matrix.
  • Structural analysis using X-ray diffraction (XRD).
  • Electrochemical characterization including impedance spectroscopy, dielectric analysis, linear sweep voltammetry (LSV), and cyclic voltammetry (CV).

Main Results:

  • The addition of NaI increased the amorphous nature of the MC matrix, enhancing conductivity.
  • The highest DC conductivity achieved was 3.01 × 10-3 S/cm with 50 wt.% NaI.
  • The electrolytes demonstrated good ionic conductivity, ion transference numbers up to 0.93, and electrochemical stability up to 1.7 V.
  • EDLCs assembled with the MC-NaI electrolyte achieved a specific capacitance of 94.7 F/g at 10 mV/s.

Conclusions:

  • The MC-NaI system serves as an effective green polymer electrolyte for EDLCs.
  • Ions are the primary charge carriers, with high ion transference numbers observed.
  • The developed electrolytes offer a promising, environmentally friendly alternative for energy storage solutions.