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Area of Science:

  • Electrochemistry
  • Materials Science
  • Energy Storage

Background:

  • Anion carriers are crucial for graphite-based dual-ion batteries (GDIBs) performance.
  • Previous studies overlooked anion behavior in electrolytes.
  • Optimizing electrolytes is key for stable, high-rate GDIBs.

Purpose of the Study:

  • Investigate anion behavior in locally high concentrated electrolytes (LHCE) for GDIBs.
  • Understand how diluents affect anion mobility and intercalation.
  • Enhance electrochemical performance and cycling stability of GDIBs.

Main Methods:

  • Formulation of locally high concentrated electrolytes (LHCE) by diluting highly concentrated electrolytes (HCE).
  • Electrochemical characterization of GDIBs using LHCE.
  • Analysis of interfacial layer formation and ion transport.

Main Results:

  • LHCE facilitates more free anions compared to HCE, reducing ion pair aggregation.
  • Free anions exhibit lower energy barriers for graphite intercalation.
  • An inorganic-rich, thin interfacial layer with fast ion conduction is formed, enhancing cathode stability.
  • Dual-graphite DIBs in LHCE retained 98.3% capacity after 1000 cycles at 200 mA g⁻¹.

Conclusions:

  • Regulating anion status in LHCE significantly enhances GDIB electrochemical performance.
  • Understanding anion chemistry is vital for advancing GDIB technology.
  • LHCE offers a promising strategy for developing high-performance, long-lasting GDIBs.