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Cellulose and Pectic Polysaccharides01:15

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 Every plant cell has a cell wall that protects the cell, provides structural support, and gives the cell shape. Cellulose, the main structural component of the plant cell wall, makes up over 30% of plant matter. It is the most abundant organic compound on earth.  Cellulose is an unbranched polysaccharide composed of linear chains of glucose molecules linked by β (1→4) glycosidic bonds.
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Solid-state Graft Copolymer Electrolytes for Lithium Battery Applications
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Poly(Ionic) Liquid-Enhanced Ion Dynamics in Cellulose-Derived Gel Polymer Electrolytes.

Tiago G Paiva1,2, Maykel Klem1,3, Sara L Silvestre1

  • 1I3N, Cenimat, Department of Materials Science (DCM), NOVA School of Science and Technology, NOVA University of Lisbon, Caparica, 2829-516, Portugal.

Chemsuschem
|November 6, 2024
PubMed
Summary

Cellulose-based gel polymer electrolytes with ionic liquids show promise for energy storage. Anionic polymers improved lithium-ion transport, achieving transference numbers similar to liquid electrolytes for micro supercapacitors.

Keywords:
CelluloseEnergy storageNuclear magnetic resonancePoly(Ionic liquids)Supercapacitors

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Polymer Science

Background:

  • Gel polymer electrolytes (GPEs) offer advantages over conventional electrolytes by combining solid and liquid properties.
  • Cellulose-based materials are abundant, eco-friendly, and suitable for developing advanced GPEs.

Purpose of the Study:

  • To develop cellulose-based GPEs using methyl cellulose and various ionic liquid dopants.
  • To investigate the influence of different dopants on ion dynamics and molecular interactions in GPEs.
  • To evaluate the performance of these GPEs in micro supercapacitor devices.

Main Methods:

  • GPEs synthesized using methyl cellulose, ionic liquids ([Pyr14][TFSI]), polymeric ionic liquids ([PDADMA][TFSI]), and anionic polymeric ionic liquids (LiP[STFSI]).
  • Characterization via Attenuated Total Reflectance Fourier-Transform Infrared Spectroscopy (ATR-FTIR), Heteronuclear Overhauser Enhancement Spectroscopy (HOESY), and Pulsed-Field Gradient Nuclear Magnetic Resonance Diffusion (PFG-NMR).
  • Calculation of Li+ transference numbers (tLi+).

Main Results:

  • GPEs incorporating slow-diffusing polymeric ionic liquids and fast-diffusing lithium salts achieved high Li+ transference numbers.
  • The anionic polymeric ionic liquid (LiP[STFSI]) significantly enhanced lithium-ion transport, yielding transference numbers comparable to liquid electrolytes.
  • Micro supercapacitors (MSCs) fabricated with these GPEs demonstrated capacitive behavior.

Conclusions:

  • The nature of the polymer dopant critically influences lithium-ion transport in GPEs.
  • Optimized GPEs show potential for enhancing performance in sustainable energy storage systems.
  • Further development of GPE composition can lead to improved efficiency for applications like micro supercapacitors.