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Expanded graphite demonstrates high capacity and stability as a sodium-ion (Na+) battery anode, overcoming the limitations of traditional graphite anodes due to its increased interlayer spacing.

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Energy Storage

Background:

  • Graphite is the standard anode for lithium-ion (Li+) batteries but exhibits poor performance in sodium-ion (Na+) batteries.
  • Insufficient interlayer spacing in graphite hinders efficient sodium-ion (Na+) intercalation and deintercalation.

Purpose of the Study:

  • To investigate expanded graphite as a novel anode material for sodium-ion (Na+) batteries.
  • To address the capacity limitations of graphite anodes in sodium-ion (Na+) battery applications.

Main Methods:

  • Preparation of expanded graphite via oxidation and partial reduction of graphite.
  • Characterization of expanded graphite's structural properties, including interlayer spacing (4.3 Å).
  • In situ transmission electron microscopy (TEM) to observe Na+ ion behavior.
  • Galvanostatic cycling studies to evaluate electrochemical performance.

Main Results:

  • Expanded graphite exhibits an enlarged interlayer distance while maintaining a layered structure.
  • In situ TEM confirmed reversible Na+ ion insertion and extraction in expanded graphite.
  • Achieved a high reversible capacity of 284 mAh g(-1) at 20 mA g(-1).
  • Maintained 184 mAh g(-1) at 100 mA g(-1) and retained 73.92% capacity after 2,000 cycles.

Conclusions:

  • Expanded graphite is a promising anode material for high-performance sodium-ion (Na+) batteries.
  • The enhanced interlayer spacing is key to overcoming the limitations of graphite anodes.
  • Expanded graphite offers excellent capacity, rate capability, and long-term cycling stability.