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Interfacial Spinel Local Interlocking Strategy Toward Structural Integrity in P3 Oxide Cathodes.

Jia-Yang Li1, Hai-Yan Hu2,3, Hong-Wei Li3

  • 1Institute for Superconducting and Electronic Materials Australian Institute for Innovative Materials University of Wollongong Innovation Campus, Squires Way, North Wollongong, NSW 2522, Australia.

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Summary
This summary is machine-generated.

P3-layered transition oxide cathodes show promise for sodium-ion batteries but degrade quickly. An interfacial spinel interlocking strategy was developed to prevent manganese dissolution and structural collapse, significantly improving cycling performance.

Keywords:
P3/spinel layered oxide cathodeselectrochemistryfailure mechanisminterfacial spinel local interlocking strategysodium-ion batteries

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Energy Storage

Background:

  • P3-layered transition oxide cathodes offer high capacity and fast sodium-ion kinetics but suffer from capacity degradation.
  • Key failure mechanisms include manganese dissolution, migration, and irreversible phase transitions leading to structural collapse.

Purpose of the Study:

  • To investigate the failure mechanisms of P3 cathodes.
  • To develop an interfacial engineering strategy to enhance the stability and cycling performance of P3 cathodes for sodium-ion batteries.

Main Methods:

  • Systematic investigation of P3 cathode failure mechanisms.
  • Development and application of an interfacial spinel local interlocking strategy using P3/spinel intergrowth oxide.
  • Validation using depth-etching X-ray photoelectron spectroscopy, X-ray absorption spectroscopy, and in situ synchrotron-based X-ray diffraction.

Main Results:

  • The proposed interfacial spinel local interlocking strategy effectively suppressed manganese migration and maintained local structure.
  • P3/spinel intergrowth oxide cathodes exhibited enhanced cycling performance compared to conventional P3 cathodes.
  • The strategy mitigated irreversible P3-O3' phase transitions and structural collapse.

Conclusions:

  • Interfacial spinel local interlocking engineering is a promising strategy for developing stable and high-performance cathode materials for sodium-ion batteries.
  • This approach addresses critical degradation issues in P3-layered transition oxides.
  • Further development of such strategies can accelerate the practical application of sodium-ion batteries.