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Tracking Interphase Growth at Alloy Anode Interfaces in Sulfide Solid-State Batteries.

Won Joon Jeong1, Douglas Lars Nelson1, Congcheng Wang2

  • 1School of Materials Science and Engineering, Georgia Institute of Technology, Atlanta, Georgia 30332, United States.

Journal of the American Chemical Society
|December 31, 2025
PubMed
Summary
This summary is machine-generated.

Alloy anodes show enhanced stability in solid-state batteries (SSBs) compared to lithium metal. Interphase growth is significantly reduced on alloy anodes, improving chemical stability for safer, high-performance SSBs.

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Battery Technology

Background:

  • Chemical stability of solid-state electrolytes (SSEs) with anodes is crucial for solid-state battery (SSB) performance and safety.
  • Interphase formation between lithium metal and sulfide SSEs is known, but less understood for alloy anodes like silicon and aluminum.

Purpose of the Study:

  • To track and quantify interphase growth (rate, thickness, composition) between Li6PS5Cl SSE and various alloy anodes.
  • To compare the interfacial stability of alloy anodes against pure lithium metal in SSBs.

Main Methods:

  • Coulometric titration time analysis (CTTA) to measure interphase growth on Ag, Al, Si, and Ge alloy anodes.
  • Time-of-flight secondary-ion mass spectrometry (TOF-SIMS) for interphase composition analysis.

Main Results:

  • Alloy anodes exhibited less than half the interphase thickness of pure Li metal after 400 hours.
  • Interphase growth rate depended on applied stack pressure and alloy material properties.
  • Interfacial contact area, influenced by alloy mechanics, critically affected growth rate.

Conclusions:

  • Alloy anodes demonstrate superior interfacial stability with Li6PS5Cl SSE compared to Li metal.
  • Alloy anodes offer a promising alternative for enhanced stability in sulfide-based SSBs.
  • Understanding interfacial contact area is key to optimizing SSB anode stability.