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Jinran Sun1,2, Shu Zhang1, Jiedong Li1

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Researchers developed a robust artificial solid electrolyte interphase (SEI) for anode-free lithium-metal batteries (AFLMBs). This new SEI enhances battery lifespan by over 250% by improving mechanical stability and ionic conductivity.

Keywords:
Griffith theory of brittle fractureanode-free batteriesartificial solid electrolyte interphasedendrite suppressionionic conductivity

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Battery Technology

Background:

  • Anode-free lithium-metal batteries (AFLMBs) offer high energy density but suffer from capacity fade due to solid electrolyte interphase (SEI) mechanical degradation.
  • Existing artificial SEI materials face a trade-off between ionic conductivity and mechanical robustness, limiting their effectiveness.

Purpose of the Study:

  • To develop a composite artificial SEI with enhanced mechanical toughness and high ionic conductivity for AFLMBs.
  • To overcome the limitations of current SEI materials in maintaining structural integrity and performance.

Main Methods:

  • A co-sputtering approach was used to create a composite artificial SEI integrating lithium fluoride (LiF) and lithium phosphorus oxynitride (LiPON).
  • The structural and electrochemical properties of the LiF-LiPON heterostructure were analyzed.

Main Results:

  • The integrated LiF-LiPON SEI exhibited significantly improved fracture toughness (by an order of magnitude) due to the high Young's modulus of LiF domains.
  • The heterostructure facilitated additional Li+ transport pathways, achieving ionic conductivity >10^-6 S cm^-1.
  • AFLMBs utilizing this artificial SEI demonstrated a cycling lifetime increase of over 250%.

Conclusions:

  • The developed tenacious composite artificial SEI effectively addresses SEI mechanical degradation in AFLMBs.
  • Integrating materials with contrasting properties (LiF and LiPON) is a viable strategy for designing high-performance SEI layers.
  • Fracture toughness is a critical factor for the long-term structural integrity and performance of AFLMBs.