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Integrated Oxygen-Constraining Strategy for Ni-Rich Layered Oxide Cathodes.

Miao Chang1, Fangyuan Cheng1, Wen Zhang1

  • 1State Key Laboratory of Material Processing and Die & Mould Technology, School of Materials Science and Engineering, Huazhong University of Science and Technology, Wuhan, Hubei 430074, China.

ACS Nano
|December 25, 2024
PubMed
Summary

A novel multilevel oxygen-constraining strategy stabilizes nickel-rich layered oxide cathodes for high-energy lithium-ion batteries. This approach mitigates oxygen loss and degradation, enhancing cycling stability at high voltages and temperatures.

Keywords:
lithium-ion batteriesnickel-rich layered cathodeoxygen releasesinglet oxygensurface engineering

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Energy Storage

Background:

  • Nickel-rich layered oxides are crucial for high-energy lithium-ion batteries.
  • These materials suffer from oxygen loss and structural degradation, limiting performance.
  • Current surface modifications offer limited protection against these issues.

Purpose of the Study:

  • To develop an effective oxygen-constraining strategy for stabilizing nickel-rich layered oxide cathodes.
  • To address oxygen evolution and structural degradation during battery operation.
  • To enhance the electrochemical performance and cycling stability of lithium-ion batteries.

Main Methods:

  • Engineered a La, Fe gradient diffusion layer and LaFeO3 coating on Ni-rich layered particles.
  • Incorporated an antioxidant binder into the electrode formulation.
  • Constructed a three-tiered defense system: subsurface oxygen immobilization, interface oxygen blocking, and surface oxygen capture.

Main Results:

  • Achieved effective surface passivation and mitigated bulk/surface degradation.
  • Suppressed detrimental side reactions, leading to enhanced electrochemical performance.
  • Demonstrated impressive cycling stability in half and full cells, even at 4.7 V and 45 °C.

Conclusions:

  • The multilevel oxygen-constraining strategy offers superior protection compared to single modifications.
  • This approach significantly enhances the stability and performance of Ni-rich layered oxide cathodes.
  • The strategy is extendable to other layered oxide cathodes facing oxygen release challenges, advancing high-energy battery development.