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Hierarchical Microstructured K3V2(PO4)3/C-Composite Electrode for Potassium-Ion Batteries through Scalable

Andreas Heyn1, Celine Röder1, Holger Geßwein1

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Summary

Hierarchically structured potassium vanadium phosphate (KVP) composites were synthesized using spray-drying for improved potassium-ion battery performance. This method enhances electronic conductivity and electrochemical activity in KVP materials.

Keywords:
cathode materialscompositeshierarchical structuresmicrostructurespotassium‐ion‐batteriespotassium‐vanadium‐phosphates

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Energy Storage

Background:

  • Potassium vanadium phosphate (KVP) is a promising cathode material for potassium-ion batteries.
  • KVP exhibits limited electrochemical performance due to low electronic conductivity, a common issue in polyanionic materials.

Purpose of the Study:

  • To develop a scalable method for synthesizing hierarchically structured KVP/C composites.
  • To improve the electronic conductivity and electrochemical performance of KVP for potassium-ion batteries.
  • To investigate the effect of carbon sources on material microstructure and electrochemical properties.

Main Methods:

  • A scalable spray-drying process was employed to create KVP/C composites.
  • Sucrose and β-lactose were used as carbon sources, influencing granule microstructure.
  • Electrochemical performance was evaluated, and the best composition was further tested with electrolyte additives.

Main Results:

  • Spray-drying produced spherical, porous KVP/C granules with KVP particles embedded in a carbon matrix.
  • Different carbon sources led to variations in granule microstructure and electrochemical performance.
  • The optimized KVP/C composite demonstrated improved electrochemical properties.

Conclusions:

  • The spray-drying method is effective for creating hierarchically structured KVP/C composites with enhanced performance.
  • Controlling the carbon source is crucial for tailoring the microstructure and electrochemical behavior.
  • Further studies on electrolyte additives can further enhance stability at high potentials.