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Binary Biomass-Based Electrolyte Films for High-Performance All-Solid-State Supercapacitor.

Rui Lou1, Guocheng Zhang1, Taoyuan Niu1

  • 1College of Mechanical and Electrical Engineering, Shaanxi University of Science and Technology, Xi'an 710021, China.

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Summary
This summary is machine-generated.

This study developed a novel biomass-based solid electrolyte film using lignin nanoparticles and sodium alginate for advanced supercapacitors. The new material offers improved ionic conductivity and stable performance in flexible devices.

Keywords:
electrochemicallignin nanoparticlessodium alginatesolid electrolytesupercapacitor

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Biomass Valorization

Background:

  • Solid-state electrolytes are crucial for safer and higher-performing supercapacitors, addressing liquid electrolyte leakage issues.
  • Existing solid-state electrolytes require further improvements in electrochemical performance and environmental sustainability.
  • Biomass-derived materials offer a sustainable and abundant source for advanced energy storage applications.

Purpose of the Study:

  • To synthesize and characterize a binary biomass-based solid electrolyte film (LSE) using lignin nanoparticles (LNPs) and sodium alginate (SA).
  • To investigate the influence of the SA to LNP mass ratio on the LSE's microstructure, porosity, absorption capacity, and ionic conductivity.
  • To evaluate the electrochemical performance of the LSE in a symmetric all-solid-state supercapacitor (SSC) device.

Main Methods:

  • Synthesis of lignin nanoparticles (LNPs) and sodium alginate (SA) based solid electrolyte films (LSEs) with varying SA:LNP ratios.
  • Microstructural analysis, porosity, and liquid absorption capacity measurements of the LSE films.
  • Ionic conductivity measurements and electrochemical performance testing of LSE-based supercapacitors, including cyclic voltammetry and galvanostatic charge-discharge.
  • Fabrication of a symmetric all-solid-state supercapacitor using LSE-15 as the electrolyte and LNP-based carbon aerogel (LCA) as electrodes.

Main Results:

  • Optimized LSE films exhibited uniform pore structures, enhanced porosity (58.4%), and high liquid absorption capacity (308%) at 15% SA.
  • The ionic conductivity of the LSE-15 reached 14.10 mS cm-1, showing a significant improvement with increasing SA content.
  • The fabricated SSC device demonstrated a high specific capacitance of 197 F g-1 at 0.5 A g-1, with energy and power densities of 27.33 W h kg-1 and 4998 W kg-1, respectively.
  • The SSC device maintained stable performance under mechanical stress (compression, bending) and various connection configurations.

Conclusions:

  • The binary biomass-based solid electrolyte film offers a promising alternative to conventional electrolytes for high-performance supercapacitors.
  • The developed LSE material demonstrates excellent ionic conductivity, mechanical stability, and electrochemical performance, suitable for flexible energy storage.
  • This work highlights a sustainable strategy for utilizing high-value biomass resources in the development of advanced energy storage devices.