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Predominant P3-Type Solid-Solution Phase Transition Enables High-Stability O3-Type Na-Ion Cathodes.

Hao Guo1, Chenglong Zhao2, Dong Zhou3

  • 1China Institute of Atomic Energy, Beijing 102413, P. R. China.

ACS Applied Materials & Interfaces
|May 16, 2024
PubMed
Summary

Researchers enhanced sodium-ion battery cathodes by introducing P-type characteristics into O3-type layered oxides. This strategy improved cycling stability and rate performance, crucial for next-generation energy storage.

Keywords:
Na-ion batteriesNa0.75Ni0.25Cu0.10Fe0.05Mn0.15Ti0.45O2O3-type cathodeO3−P3−P3′P3-dominated phase transition

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Energy Storage

Background:

  • Layered O3-type oxides are key cathode materials for sodium-ion batteries due to high capacity and simple synthesis.
  • Challenges include irreversible structural transitions at high voltages, hindering cycling stability and rate performance.

Purpose of the Study:

  • To understand the composition-structure-property interplay in Na-ion layered oxides.
  • To enhance the stability and performance of O3-type cathode materials.

Main Methods:

  • Introducing P-type characteristics into O3-type layered structures.
  • Achieving a P3-dominated solid-solution phase transition during cycling.
  • Investigating the reversible O3-P3-P3' structural transformation with minimal volume changes.

Main Results:

  • The modified Na0.75Ni0.25Cu0.10Fe0.05Mn0.15Ti0.45O2 cathode achieved a specific capacity of ~113 mAh/g.
  • Exceptional cycling stability was demonstrated, retaining over 70% capacity after 900 cycles.
  • Minimal and gradual volume changes were observed during the O3-P3-P3' structural transformation.

Conclusions:

  • Successfully integrated P-type characteristics into O3-type layered oxides for improved Na-ion battery performance.
  • The findings provide critical insights into composition-structure-property relationships for advanced Na-ion battery cathodes.
  • This approach offers a promising strategy for developing stable and high-performance sodium-ion batteries.