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Constraining Interlayer Slipping in P2-Type Layered Oxides with Oxygen Redox by Constructing Strong Covalent Bonds.

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Introducing antimony into P2-type layered oxides enables a Z phase transition, enhancing sodium-ion battery cathodes. This strategy improves structural stability and ion diffusion, boosting energy density and performance.

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Energy Storage

Background:

  • Lattice oxygen redox (LOR) in P2-type layered oxides offers high energy density for sodium-ion batteries.
  • However, LOR can cause structural distortion and irreversible phase transitions, degrading performance.

Purpose of the Study:

  • To replace the detrimental OP4 phase with a stable Z phase in P2-type layered oxides.
  • To enhance the electrochemical performance of sodium-ion battery cathodes by introducing antimony (Sb).

Main Methods:

  • Substitution of transition metal (TM) layers with Sb in P2-type oxides.
  • Analysis of phase transitions and structural stability.
  • Electrochemical testing of half and full cells.

Main Results:

  • Sb introduction promotes a Z phase transition, suppressing OP4 phase formation.
  • The Z phase transition reduces structural strain and lowers Na+ diffusion barriers.
  • Sb-substituted oxides exhibit excellent kinetics, rate capability (79 mAh g-1 at 1 A g-1), and high energy density (487 Wh kg-1).

Conclusions:

  • Replacing OP4 with Z phase via Sb substitution is a viable strategy for stable, high-energy sodium-ion battery cathodes.
  • This approach mitigates LOR-induced degradation, paving the way for practical applications.