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Defect engineering unveiled: Enhancing potassium storage in expanded graphite anode.

Kai-Yang Zhang1, Han-Hao Liu2, Meng-Yuan Su2

  • 1MOE Key Laboratory for UV Light-Emitting Materials and Technology, Northeast Normal University, Changchun, Jilin 130024, China.

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|March 15, 2024
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Summary
This summary is machine-generated.

Defect engineering in expanded graphite enhances potassium-ion battery performance. Introducing defects via ball milling improves potassium ion adsorption and intercalation, boosting capacity and rate capability for advanced energy storage.

Keywords:
AnodeDefectGraphitePotassium-Ion BatteriesStage Reaction

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Energy Storage

Background:

  • Expanded graphite (EG) is a potential anode material for potassium-ion batteries.
  • Limited ion diffusion and storage sites in EG restrict electrochemical performance.
  • Defect engineering offers a strategy to enhance ion adsorption and reaction kinetics.

Purpose of the Study:

  • To investigate the effectiveness of defects in facilitating potassium storage in EG.
  • To explore the impact of defect-rich EG structures on ion dynamics.
  • To improve the electrochemical performance of EG for potassium-ion batteries.

Main Methods:

  • Surface defects were introduced into EG using ball milling.
  • Electrochemical performance was evaluated through capacity and rate capability tests.
  • The influence of defects on potassium ion adsorption and intercalation was analyzed.

Main Results:

  • Ball-milled EG exhibited enhanced adsorption and intercalation of potassium ions.
  • Defect-rich EG showed a notable capacity of 286.2 mAh g⁻¹ at 25 mA g⁻¹.
  • The material demonstrated superior rate capability compared to pristine EG.
  • Defects promoted diluted stage compound formation and multiple stage reactions.

Conclusions:

  • Defect engineering is an effective strategy for enhancing EG performance in potassium-ion batteries.
  • Surface defects significantly improve potassium ion storage and kinetics.
  • This work provides insights into defect-induced dynamic processes for advanced carbon materials.