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Electro-Chemo-Mechanical Evolution at the Garnet Solid Electrolyte-Cathode Interface.

Younggyu Kim1,2, Subhash Chandra1,2, Iradwikanari Waluyo3

  • 1Laboratory for Electrochemical Interfaces, Department of Nuclear Science and Engineering, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, United States.

ACS Applied Materials & Interfaces
|August 5, 2024
PubMed
Summary
This summary is machine-generated.

Solid-state batteries face electro-chemo-mechanical instabilities at interfaces. High temperatures and voltages cause degradation in NMC622 cathodes and LLZO electrolytes, leading to cracks and capacity loss.

Keywords:
FIB-SEMLLZONMCX-ray absorption spectroscopylithium nickel manganese cobalt oxidesolid-state battery

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Solid-state batteries

Background:

  • Solid-state batteries offer improved safety and energy density over lithium-ion batteries.
  • Electro-chemo-mechanical instabilities at interfaces hinder large-scale implementation of solid-state batteries.

Purpose of the Study:

  • To investigate the electro-chemo-mechanical instability mechanisms between LiNi0.6Mn0.2Co0.2O2 (NMC622) cathodes and Li7La3Zr2O12 (LLZO) solid electrolytes.
  • To determine the onset conditions for these interfacial instabilities.

Main Methods:

  • Utilized thin-film NMC622 on LLZO pellets for X-ray characterization.
  • Employed in operando X-ray absorption spectroscopy and ex situ focused ion beam scanning electron microscopy to probe the interface.
  • Conducted electrochemical cycling and potentiostatic holds at various temperatures and voltages.

Main Results:

  • No electrochemical degradation observed at room temperature or low voltage cutoffs.
  • Secondary phases (reduced Ni2+, Co2+) formed at 80 °C and 4.3 V vs Li/Li+.
  • Intergranular cracks and delamination at the NMC622|LLZO interface occurred after initial charging, reducing capacity and efficiency.

Conclusions:

  • Electrochemical instability is linked to high temperature and voltage, causing material degradation and mechanical failure.
  • Mitigation strategies include lower charge voltage cutoffs and reduced operating temperatures.
  • Engineering mechanical properties is crucial for enhancing interfacial stability and battery performance.