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Cathode chemomechanics controls Li metal solid-state battery performance under low stack pressures.

Saeed Moradi1,2,3, Beniamin Zahiri4,5, Paul V Braun6,7,8,9,10

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This summary is machine-generated.

Controlling cathode stress is key for practical solid-state batteries (SSBs). This study shows cathode chemomechanics significantly impact lithium metal plating and stripping, enabling long cycle-life SSBs at low pressures.

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Energy Storage

Background:

  • Solid-state batteries (SSBs) face interface failures due to electrode material chemomechanics.
  • Anode stress has been a focus, but cathode stress also critically impacts SSB performance.
  • Achieving practical Li metal SSBs requires understanding and mitigating these stresses.

Purpose of the Study:

  • To investigate the role of positive electrode (cathode) chemomechanical stress in Li metal solid-state batteries.
  • To demonstrate the influence of cathode lattice strain anisotropy on battery performance.
  • To develop strategies for long cycle-life SSBs operating at low stack pressures.

Main Methods:

  • Utilized model textured positive electrodes to study chemomechanical stress.
  • Performed electrochemical cycling under controlled low stack pressures (<1 MPa).
  • Analyzed the relationship between cathode lattice strain anisotropy and Li metal plating/stripping behavior.

Main Results:

  • Positive electrode chemomechanical stress significantly affects Li metal plating and stripping at low stack pressures.
  • Cathode lattice strain anisotropy plays a crucial role in positive electrode chemomechanics.
  • Demonstrated long cycle-life SSBs with practical areal capacity (5 mAh/cm²) at 1 MPa stack pressure and room temperature.

Conclusions:

  • Cathode chemomechanics are critical for the performance and stability of Li metal solid-state batteries.
  • Controlling positive electrode lattice strain is essential for mitigating interface failures.
  • This research paves the way for developing practical, low-pressure solid-state batteries.