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Area of Science:

  • Materials Science
  • Electrochemistry
  • Battery Technology

Background:

  • Lithium plating on graphite anodes is a major challenge for fast-charging batteries, limiting cycle life and safety.
  • Identifying the rate-limiting step for lithium plating is difficult, hindering effective prevention strategies.

Purpose of the Study:

  • To develop a method for regulating lithium plating and controlling anode morphology during fast charging.
  • To investigate the role of the solid electrolyte interphase (SEI) in lithium plating and reversibility.

Main Methods:

  • Utilized a localized high-concentration electrolyte (LHCE) to achieve reversible lithium plating on graphite anodes.
  • Deeply investigated SEI evolution before and after lithium plating to understand interface polarization.
  • Fabricated and tested a 1.2-Ah pouch cell with a LiNi0.5Mn0.3Co0.2O2 cathode and graphite anode.

Main Results:

  • Achieved highly reversible lithium plating on graphite anodes using LHCE, even at high charge rates.
  • Observed a stable, LiF-rich SEI layer that improved anode performance.
  • Demonstrated a Coulombic efficiency of 99.9% over 240 cycles and 99.95% lithium plating reversibility.
  • The pouch cell retained 84.4% capacity after 150 cycles at 6C (7.2A).

Conclusions:

  • LHCE effectively regulates lithium plating and enhances graphite anode reversibility for fast charging.
  • The stable SEI layer plays a crucial role in the improved electrochemical performance.
  • This approach offers a promising strategy for developing high-performance, fast-charging lithium-ion batteries.