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Synergistic Multi-Scale Confinement Engineering Stabilizes Organic Anode for High-Performance Potassium-Ion

Xiaokang Chu1, Ran Chen1, Chi Hu1

  • 1Department of Chemistry and Materials Science, College of Science, Nanjing Forestry University, Nanjing, P. R. China.

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|January 16, 2026
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Summary
This summary is machine-generated.

Researchers developed a new anode for potassium-ion batteries (PIBs) using confined organic molecules. This strategy overcomes material dissolution and enhances stability, paving the way for high-performance PIBs.

Keywords:
electrolyte regulationorganic anodepotassium ion batteriesreaction kineticstriple confinement

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Energy Storage

Background:

  • Organic small molecules offer high capacity for potassium-ion batteries (PIBs).
  • Key challenges include active material dissolution, interface instability, and slow kinetics, leading to capacity fade.
  • These issues limit the practical application of organic anodes in PIBs.

Purpose of the Study:

  • To address the limitations of organic anodes in PIBs through multi-scale confinement engineering.
  • To enhance structural stability, interfacial properties, and reaction kinetics of organic electrode materials.
  • To develop a high-performance anode for advanced potassium-ion battery applications.

Main Methods:

  • Synergistic multi-scale confinement engineering at molecule-ion-electron levels.
  • Physical confinement of active molecules within ordered mesoporous conductive carbon (CMK3).
  • Utilizing a high-concentration electrolyte (3 m KFSI in EC/DEC) to stabilize the solid-electrolyte interface.
  • Molecular design with an electron-withdrawing fluorine substituent to optimize electronic structure.

Main Results:

  • The 2FBA@CMK3 anode demonstrated excellent structural stability and efficient electron transport.
  • The high-concentration electrolyte effectively regulated anion activity and stabilized the interface.
  • The fluorine substituent enhanced potassium storage kinetics and capacity.
  • Achieved a reversible capacity of 152 mAh/g after 400 cycles at 500 mA/g, outperforming most reported organic PIB anodes.

Conclusions:

  • The multi-scale confinement strategy effectively addresses the drawbacks of organic anodes in PIBs.
  • This approach establishes a rational design paradigm for developing advanced organic electrode materials.
  • The developed anode shows significant potential for high-performance and stable potassium-ion batteries.