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A novel eutectogel electrolyte enables stable operation of lithium metal batteries by preventing lithium dendrite growth and protecting the LiCoO2 cathode. This breakthrough supports high-voltage applications and enhances battery safety.

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LCO cathodeeutectogel electrolytehigh voltagelithium metal batteriesstructure/interface stability

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Energy Storage

Background:

  • Lithium metal batteries face challenges like lithium dendrite growth, cathode degradation, and unstable interfaces, hindering high-energy-density applications.
  • Current limitations restrict the practical use of LiCoO2 cathodes at high operating voltages.

Purpose of the Study:

  • To develop a novel eutectogel electrolyte for high-energy-density lithium metal batteries.
  • To address challenges associated with lithium dendrite formation and LiCoO2 cathode stability at high voltages.

Main Methods:

  • A nonflammable eutectic electrolyte was confined within a polymer matrix to create a eutectogel electrolyte.
  • The electrolyte's ability to form a protective solid electrolyte interphase (SEI) and cathode interface layer was investigated.
  • Performance was evaluated using Li||Li symmetrical cells and LiCoO2||Li full cells.

Main Results:

  • The eutectogel electrolyte formed an inorganic-rich SEI (LiF, Li3N) promoting uniform lithium deposition.
  • An in situ protective layer mitigated side reactions between the LiCoO2 cathode and electrolyte.
  • Li||Li cells demonstrated over 1000 hours of stable Li plating/stripping.
  • A LiCoO2||Li full cell retained 72.5% capacity after 1500 cycles at 4.45 V with a low decay rate (0.018%/cycle).
  • Stable operation of LiCoO2 was achieved at an extreme cutoff voltage of 4.6 V.

Conclusions:

  • The developed eutectogel electrolyte offers a promising solution for advancing lithium metal battery technology.
  • Its nonflammable nature and ability to regulate interfaces significantly enhance the high-voltage performance of LiCoO2 cathodes.
  • This work paves the way for safer and more efficient energy storage solutions.