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Covalent organic frameworks (COFs) can now be mechanically processed into shaped objects. These processed COFs show potential as solid-state electrolytes for advanced battery applications.

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Area of Science:

  • Materials Science
  • Chemistry
  • Crystallography

Background:

  • Covalent organic frameworks (COFs) are typically insoluble powders, limiting their application in devices.
  • Processing COFs into usable forms for device integration has been a significant challenge in materials science.

Purpose of the Study:

  • To investigate the mechanical processability of covalent organic frameworks (COFs).
  • To explore the potential of processed COFs as solid-state electrolytes in electrochemical devices.

Main Methods:

  • Mechanical pressing of five different COFs with varying functionality and symmetry.
  • Analysis of crystallographic orientation (hk0 and 00l planes) in pressed COF objects.
  • Impregnation of COF pellets with LiClO4 for conductivity measurements.

Main Results:

  • COFs can be successfully pressed into shaped objects exhibiting anisotropic ordering.
  • The processing method demonstrated generality across five different COFs, showing remarkable stability.
  • Impregnated COF pellets achieved room temperature conductivity up to 0.26 mS cm(-1) with high electrochemical stability.

Conclusions:

  • Mechanical pressing is a viable method for processing insoluble COFs into ordered structures.
  • Processed COFs demonstrate excellent electrochemical stability and ionic conductivity.
  • This work opens new avenues for utilizing COFs as solid-state electrolytes in next-generation batteries.