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Circumventing Self-Diffusion Enables High-Rate Hard Carbon Anodes.

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Summary
This summary is machine-generated.

This study identifies slow sodium diffusion in metallic clusters as the key barrier in hard carbons for sodium-ion batteries. A novel heterostructure design overcomes this, enabling faster charging and higher energy density.

Keywords:
anodehard carbonheterostructureskineticssodium‐ion batteries

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Energy Storage

Background:

  • Hard carbons (HCs) are promising anodes for sodium-ion batteries (SIBs).
  • Sluggish kinetics at low potentials (<0.1 V) limit fast-charging capability in HCs.
  • The origin of this kinetic limitation in HCs is not fully understood.

Purpose of the Study:

  • To elucidate the fundamental barrier limiting fast-charging in hard carbons for SIBs.
  • To design and synthesize an optimized hard carbon material with enhanced sodium-ion diffusion kinetics.
  • To demonstrate the improved electrochemical performance of the designed hard carbon anodes.

Main Methods:

  • First-principles calculations were employed to investigate sodium diffusion mechanisms.
  • In situ and ex situ characterization techniques were utilized to analyze material structure and ion transport.
  • A novel heterostructure of graphitic nanobelts embedded in an amorphous carbon matrix was designed.

Main Results:

  • Slow sodium self-diffusion within metallic clusters was identified as the primary kinetic barrier in HCs.
  • The designed heterostructure successfully redirected Na+ diffusion through rapid interlaminar pathways.
  • Optimized HCs exhibited a high reversible capacity (386 mAh g-1 at 20 mA g-1) and excellent rate capability (312 mAh g-1 at 200 mA g-1).
  • The material demonstrated robust cyclic stability (98% retention after 1000 cycles).

Conclusions:

  • Slow sodium diffusion in metallic clusters is the fundamental limitation for fast-charging hard carbons.
  • A rationally designed heterostructure can overcome this barrier by promoting rapid interlaminar diffusion.
  • The developed hard carbons offer superior energy and power densities compared to graphite in lithium-ion batteries, paving the way for advanced SIBs.