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Network Covalent Solids02:18

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Network covalent solids contain a three-dimensional network of covalently bonded atoms as found in the crystal structures of nonmetals like diamond, graphite, silicon, and some covalent compounds, such as silicon dioxide (sand) and silicon carbide (carborundum, the abrasive on sandpaper). Many minerals have networks of covalent bonds.
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Bi-Induced Few-Layered Graphite Frameworks as Efficient Interfacial Transitions Toward Ultrafast Potassium Storage.

Bozhi Yang1, Xin Min1, Xinyu Zhu1

  • 1Engineering Research Center of Ministry of Education for Geological Carbon Storage and Low Carbon Utilization of Resources, Beijing Key Laboratory of Materials Utilization of Nonmetallic Minerals and Solid Wasters, National Laboratory of Mineral Materials, School of Materials Science and Technology, China University of Geoscience (Beijing), Beijing, 100083, P. R. China.

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Summary
This summary is machine-generated.

Bismuth anode materials for potassium-ion batteries show improved performance. Novel composite structures enhance ion transport and stability, enabling high capacity and long cycle life.

Keywords:
Bi‐induced few‐layered graphitebismuth anodeinterfacial transitionpotassium ion battery

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Energy Storage

Background:

  • Bismuth (Bi) is a promising anode material for potassium-ion batteries (KIBs) due to its high theoretical capacity and eco-friendly nature.
  • However, practical application is hindered by sluggish reaction kinetics and significant volume expansion during cycling.

Purpose of the Study:

  • To develop a novel composite anode material for KIBs that overcomes the limitations of pure bismuth.
  • To enhance the electrochemical performance, specifically rate capability and cycling stability, of bismuth-based anodes.

Main Methods:

  • In situ encapsulation of few-layered graphite frameworks on Bi nanoparticles.
  • Embedding composite particles within Bi-doped porous carbon fibers.
  • Characterization of structural, morphological, and electrochemical properties.

Main Results:

  • The composite structure provides a stable framework and efficient interfacial transfer layer for rapid ion and electron transport.
  • Doped Bi atoms in carbon fibers lower the migration energy barrier for potassium ions, enhancing kinetics.
  • The porous structure effectively mitigates volume expansion, leading to superior high-rate performance and cycling stability.
  • Achieved capacity of 215 mAh g-1 at 10 A g-1 with 83.8% capacity retention after 6000 cycles.

Conclusions:

  • The developed Bi-based composite anode material demonstrates excellent potential for high-performance potassium-ion batteries.
  • The synergistic effects of graphite frameworks, porous carbon fibers, and Bi doping significantly improve electrochemical properties.
  • This strategy offers a viable pathway for designing advanced anode materials for next-generation energy storage devices.