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Multiple Electron Transfers Enable High-Capacity Cathode Through Stable Anionic Redox.

Lichen Wu1, Zhongqin Dai2, Hongwei Fu1

  • 1School of Physics and Electronics, Hunan University, Changsha, 410082, P. R. China.

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Summary
This summary is machine-generated.

This study introduces K2FeSiO4 as a novel cathode material for potassium-ion batteries, achieving high capacity and stability through oxygen redox reactions. This development advances the commercialization of efficient and cost-effective potassium-ion energy storage.

Keywords:
K2FeSiO4anionic redoxcathodemultiple electron transferpotassium‐ion batteries

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Energy Storage

Background:

  • Cathode limitations in potassium-ion batteries include single-electron transfer, low alkali metal content, and large molecular masses.
  • Developing high-capacity cathode materials is crucial for advancing potassium-ion battery technology.

Purpose of the Study:

  • To investigate K2FeSiO4 as a cost-effective, light-molecular-mass orthosilicate cathode material for potassium-ion batteries.
  • To enable multiple electron transfers beyond the limited valence change of Fe ions.

Main Methods:

  • Electrochemical cycling of K2FeSiO4 as a cathode material.
  • Analysis of redox mechanisms, including oxygen anionic redox reactions.
  • Evaluation of cycling stability and energy density.

Main Results:

  • K2FeSiO4 demonstrates high reversible capacity (236 mAh g-1) via successive oxygen anionic redox reactions.
  • The material exhibits excellent cycling stability (1400 cycles) and energy density (520 Wh kg-1), comparable to LiFePO4.
  • Silicon's strong binding effect on oxygen mitigates irreversible oxygen release and voltage degradation.

Conclusions:

  • K2FeSiO4 is a promising cathode material for high-performance potassium-ion batteries.
  • Oxygen redox activity is key to achieving high capacity in this material.
  • The findings support the commercialization potential of potassium-ion batteries.