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Scalable Dry Process for Fabricating a Na Superionic Conductor-Type Solid Electrolyte Sheet.

Suyeon Kim1,2, Seongmin Shin1,2, Dae Soo Jung1

  • 1Energy & Environmental Division, Korea Institute of Ceramic Engineering & Technology (KICET), 101 Soho-ro, Jinju-si, Gyeongsangnam-do 52581, Republic of Korea.

ACS Applied Materials & Interfaces
|February 21, 2024
PubMed
Summary
This summary is machine-generated.

This study presents a solvent-free dry process for creating high-density, flexible sodium superionic conductor solid electrolyte sheets for all-solid-state batteries. Optimized with 3 wt% polytetrafluoroethylene (PTFE) binder, the material achieved a high ionic conductivity of 1.03 mS cm-1.

Keywords:
NASICONdry fabricationflexible sheethigh ionic conductivitysolid electrolyte

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Solid-State Chemistry

Background:

  • Commercialization of all-solid-state batteries hinges on cost-effective mass production of solid electrolytes.
  • Current methods for oxide-based solid electrolytes often involve solvents and limit the concentration of the active material.

Purpose of the Study:

  • To develop an environmentally friendly, solvent-free dry process for fabricating high-density, flexible oxide-based sodium superionic conductor solid electrolyte sheets.
  • To investigate the impact of binder content and particle size on the properties of the solid electrolyte sheets produced via the dry process.

Main Methods:

  • Fabrication of a solid electrolyte sheet using a novel dry process, avoiding solvents.
  • Utilizing polytetrafluoroethylene (PTFE) as a binder, transformed into thread-like structures via shear force for flexibility.
  • Optimizing the dry process to increase the solid electrolyte powder content to over 95 wt% in the green sheets.
  • Investigating the effect of binder content (specifically 3 wt% PTFE) and finely ground solid electrolyte powder on ionic conductivity.

Main Results:

  • The dry process enabled fabrication of green sheets with significantly higher density compared to traditional wet processes.
  • The dry process allowed for a solid electrolyte powder content exceeding 95 wt%, compared to a 50 wt% limit in wet processes.
  • The optimized solid electrolyte sheet (3 wt% PTFE binder, finely ground powder) exhibited the highest total ionic conductivity, reaching 1.03 mS cm-1.

Conclusions:

  • A solvent-free dry process is effective for producing high-density, flexible oxide-based solid electrolyte sheets.
  • This method significantly increases the solid electrolyte content and improves density, crucial for battery performance.
  • The optimized material demonstrates promising ionic conductivity for applications in all-solid-state batteries.