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Constructing Mechanical-Chemical Stability via Multiphase Riveting and Interface Optimization Toward Layer-structured

Dongrun Yang1, Chen Liu2, Xuan-Wen Gao1,3

  • 1Institute for Energy Electrochemistry and Urban Mines Metallurgy, School of Metallurgy, Northeastern University, Shenyang, Liaoning, 110819, P.R. China.

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Summary
This summary is machine-generated.

Researchers developed a novel fluorine and dislocation-rich surface for manganese-based cathode materials in sodium-ion batteries. This design enhances mechanical and chemical stability, improving battery performance and longevity.

Keywords:
DislocationFluorine dopedHeterogeneous structureManganese‐based oxidesSodium‐ion batteries

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Energy Storage

Background:

  • Manganese-based layer-structured oxides are promising cathode materials for sodium-ion batteries due to cost and sodium intercalation.
  • Performance is limited by mechanical/chemical instability, Jahn-Teller effect, and surface degradation.

Purpose of the Study:

  • To enhance the electrochemical performance of manganese-based cathode materials.
  • To address mechanical and chemical instability issues in sodium-ion batteries.
  • To develop a robust multiphase structure with improved surface properties.

Main Methods:

  • Employed a quenching method to create a fluorine and dislocation-rich surface.
  • Fabricated a composite material: P2/P3/O3-Na0.89Ni0.3Mn0.55Cu0.1Ti0.05O1.94F0.06.
  • Investigated the material's stability during (de)sodiation cycles.

Main Results:

  • Achieved enhanced mechanical stability through dislocation accumulation and interlocking multiphase structures.
  • Improved chemical stability via surface fluorine anchoring.
  • Demonstrated impressive capacity retention: 87.17% after 200 cycles at 0.5 C and 90.4% at 1 C (1.5-4.5 V).

Conclusions:

  • Simultaneous design of mechano-chemically coupled materials is crucial for high-performance cathodes.
  • The developed composite shows significant potential for advanced sodium-ion battery applications.
  • Surface modification strategies are effective in overcoming material limitations.