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Area of Science:

  • Materials Science
  • Electrochemistry
  • Sustainable Energy

Background:

  • All-solid-state batteries offer improved safety and capacity over conventional lithium-ion batteries.
  • Recycling strategies for battery components are essential for sustainability and minimizing environmental harm.

Purpose of the Study:

  • To investigate the efficacy of cold sintering for reprocessing solid-state composite electrolytes.
  • To evaluate the performance and environmental impact of recycled electrolytes.

Main Methods:

  • Utilized cold sintering to reprocess Mg and Sr doped Li7La3Zr2O12 with polypropylene carbonate and lithium perchlorate (LLZO-PPC-LiClO4).
  • Assessed microstructural changes, ionic conductivity, and battery performance after multiple recycling cycles.
  • Conducted a life cycle assessment (LCA) to compare environmental impacts.

Main Results:

  • Reprocessed LLZO-PPC-LiClO4 electrolytes showed densified microstructures and ionic conductivities >10⁻⁴ S/cm after 5 cycles.
  • All-solid-state batteries with recycled electrolytes achieved a discharge capacity of 168 mA·h·g⁻¹ at 0.1 C and maintained performance over 100 cycles at 0.2 C.
  • Life cycle assessment indicated superior environmental performance for recycled electrolytes.

Conclusions:

  • Cold sintering is a viable and promising technology for recycling solid-state battery electrolytes.
  • Recycled electrolytes maintain high ionic conductivity and battery performance, contributing to a more sustainable energy storage industry.