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Area of Science:

  • Materials Science
  • Electrochemistry
  • Energy Storage

Background:

  • All solid-state batteries (SSBs) offer enhanced safety and energy density over liquid electrolyte batteries.
  • High-voltage cathodes, such as nickel-rich layered oxides (e.g., NMC532), are crucial for high energy density but prone to degradation.
  • Degradation mechanisms like oxygen loss and structural changes at the cathode surface limit cycle and thermal stability.

Purpose of the Study:

  • To investigate the surface structural evolution of LiNi0.5Mn0.3Co0.2O2 (NMC532) cathodes in an SSB environment.
  • To determine if surface coatings prevent structural degradation and oxygen loss in high-voltage NMC cathodes within SSBs.
  • To identify key factors limiting long-term stability in advanced solid-state battery systems.

Main Methods:

  • Utilized high-resolution electron microscopy techniques (e.g., TEM, STEM) for structural characterization.
  • Employed electron energy loss spectroscopy (EELS) to analyze surface chemistry and electronic structure.
  • Performed ab initio molecular dynamics simulations to study oxygen ion transport through coating materials.

Main Results:

  • Demonstrated the transformation of the NMC532 cathode surface from a layered to a rocksalt-like structure after cycling in an SSB, even with an intact Li3B11O18 (LBO) coating.
  • Confirmed facile oxygen ion (O2-) transport through the LBO coating and other typical amorphous coating materials.
  • Identified that oxygen loss is a persistent challenge impacting cathode stability in SSBs.

Conclusions:

  • Oxygen loss and subsequent structural transformation at the cathode surface remain significant barriers to achieving long cycle life in high-energy SSBs.
  • The effectiveness of amorphous coatings in preventing degradation is limited by oxygen permeability.
  • Oxygen permeability of coating materials should be a critical design consideration for future SSB development.