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Pushing the Limits: Maximizing Energy Density in Silicon Sulfide Solid-State Batteries.

Chanho Kim1, Yuanshun Li1,2, Inyoung Jang3

  • 1Chemical Sciences Division, Oak Ridge National Laboratory, Oak Ridge, TN, 37831, USA.

Advanced Materials (Deerfield Beach, Fla.)
|May 27, 2025
PubMed
Summary
This summary is machine-generated.

We developed a silicon solid-state battery (SSB) architecture exceeding 400 Wh kg-1, nearing silicon

Keywords:
NMC coatingall‐solid‐state batterieshigh energy densitysheet‐type electrolytesulfide electrolyte

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Energy Storage

Background:

  • Silicon anodes offer high theoretical capacity for next-generation batteries.
  • Solid-state electrolytes (SSEs) promise enhanced safety and energy density compared to liquid electrolytes.
  • Challenges remain in achieving high energy density and long-term stability in silicon-based solid-state batteries (SSBs).

Purpose of the Study:

  • To demonstrate a novel silicon solid-state battery (SSB) architecture achieving high energy density (>400 Wh kg-1).
  • To optimize processing techniques for key battery components (micro-Si anode, NMC811 cathode, SSE).
  • To investigate and address capacity decay mechanisms for improved long-term stability.

Main Methods:

  • Fabrication of an SSB architecture using 99.9 wt% micro-Si anode, thin sulfide solid electrolyte (SSE), and high-loading NMC811 cathode.
  • Evaluation of wet and dry processing techniques for electrode and SSE fabrication.
  • Electrochemical cycling tests at 25 °C to assess capacity retention and cycle life.
  • Post-mortem analysis to identify degradation mechanisms.

Main Results:

  • Achieved >400 Wh kg-1 energy density, approaching the theoretical limit for silicon-based SSBs.
  • Demonstrated over 1000 cycles with ≈80% capacity retention for 2 mAh cm-2.
  • Achieved 94% capacity retention over 500 cycles for 3 mAh cm-2.
  • Identified NMC/SSE interface oxidation and NMC structural disruption as primary decay mechanisms.

Conclusions:

  • Excessive lithium incorporation into the silicon host is crucial for matching cathode capacity.
  • The silicon electrode demonstrates a robust solid-electrolyte interphase (SEI), contributing to stability.
  • Improvements in NMC coatings, lattice oxygen stabilization, and cathode-electrolyte interface are necessary for long-term SSB stability.