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Preparation and Reactions of Sulfides02:26

Preparation and Reactions of Sulfides

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Sulfides are the sulfur analog of ethers, just as thiols are the sulfur analog of alcohol. Like ethers, sulfides also consist of two hydrocarbon groups bonded to the central sulfur atom. Depending upon the type of groups present, sulfides can be symmetrical or asymmetrical. Symmetrical sulfides can be prepared via an SN2 reaction between 2 equivalents of an alkyl halide and one equivalent of sodium sulfide.
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Multifunctional Coatings on Sulfide-Based Solid Electrolyte Powders with Enhanced Processability, Stability, and

Zachary D Hood1, Anil U Mane1, Aditya Sundar2

  • 1Applied Materials Division, Argonne National Laboratory, 9700 S. Cass Avenue, Lemont, IL, 60439, USA.

Advanced Materials (Deerfield Beach, Fla.)
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Summary
This summary is machine-generated.

Atomic layer deposition creates protective Al2O3 coatings on sulfide solid-state electrolytes (SSEs), enhancing stability and performance for next-generation solid-state batteries.

Keywords:
atomic layer depositionlithium metal anodesmultifunctional coatingssolid-state batteriessolid-state electrolytes

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Nanotechnology

Background:

  • Sulfide solid-state electrolytes (SSEs) offer high ionic conductivity and good mechanical properties for solid-state batteries.
  • However, their instability in ambient conditions and at interfaces limits practical application and scalability.
  • Challenges include processing difficulties and degradation at the lithium-electrolyte and cathode-electrolyte interfaces.

Purpose of the Study:

  • To enhance the stability and performance of sulfide-based solid-state electrolytes (SSEs).
  • To address issues of ambient instability and interfacial reactivity in Li6PS5Cl.
  • To enable scalable processing and improve the cycle life of solid-state batteries.

Main Methods:

  • Utilized atomic layer deposition (ALD) to apply thin aluminum oxide (Al2O3) coatings onto Li6PS5Cl powders.
  • Investigated the stability of coated powders in oxygen and humid environments.
  • Fabricated pellets from coated and uncoated powders for electrochemical testing.

Main Results:

  • Al2O3 coatings significantly improved the stability of Li6PS5Cl powders against degradation in ambient conditions.
  • Coated powders yielded pellets with up to 2x higher ionic conductivity compared to uncoated ones.
  • Demonstrated suppressed chemical reactivity at the lithium-SSE interface and improved room-temperature cycle life at high capacity and current density.

Conclusions:

  • ALD-grown Al2O3 coatings provide a scalable method to stabilize sulfide SSEs.
  • The coatings enhance intergranular properties and lithium metal adhesion, leading to superior battery performance.
  • This approach offers a new framework for developing stable and active materials for advanced solid-state batteries.