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Reducing Structural Distortion by Tailoring Orbital Interactions in High-Voltage Polyanionic Cathodes.

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  • 1Institute of Materials Research, Tsinghua Shenzhen International Graduate School, Tsinghua University, Shenzhen, 518055, China.

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|August 16, 2025
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Summary
This summary is machine-generated.

Structural distortion in potassium vanadium fluorophosphate (KVPO4F) cathodes causes battery capacity fade. Introducing manganese (Mn) stabilizes octahedra, suppressing distortion and enhancing potassium-ion battery performance.

Keywords:
electronic structureorbital interactionspolyanionic cathodestructure distortionvanadium fluorophosphate

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Solid-State Chemistry

Background:

  • Structural distortion in battery electrode materials leads to degradation and capacity fading.
  • The fundamental mechanisms driving structural distortion in high-voltage cathode materials remain poorly understood.
  • Potassium vanadium fluorophosphate (KVPO4F) is a promising cathode material for potassium-ion batteries, but its stability is a concern.

Purpose of the Study:

  • To elucidate the primary mechanism of structural distortion in KVPO4F cathodes.
  • To investigate the role of orbital interactions in octahedral distortion.
  • To develop strategies for enhancing the structural stability of high-voltage cathode materials.

Main Methods:

  • Computational analysis of orbital interactions within the KVPO4F crystal structure.
  • Synthesis and characterization of manganese-substituted KVPO4F (Mn-KVPO4F).
  • Electrochemical cycling and post-mortem structural analysis of pristine and substituted materials.

Main Results:

  • Octahedral distortion, driven by weak orbital interactions, was identified as the primary cause of structural degradation in KVPO4F.
  • Introducing manganese into the vanadium sites (Mn-KVPO4F) significantly suppresses octahedral distortion and lattice microstrain.
  • Mn-KVPO4F exhibits enhanced structural stability and improved cycling performance in high-voltage potassium-ion batteries.

Conclusions:

  • Understanding octahedral distortion is crucial for designing stable high-voltage cathode materials.
  • Manganese substitution effectively mitigates structural instability in KVPO4F by strengthening orbital interactions.
  • This work provides a pathway for developing robust cathode materials for advanced energy storage applications.