Coating layer for lithium metal battery separators, separator for lithium metal batteries, and lithium metal battery containing the same

Separator with Dendrite-Suppressing Hydrophobic Fluorinated Graphene Oxide Coating

This technology introduces a hydrophobic fluorinated graphene oxide (FGO) coating layer on one or both sides of a separator. It reacts with lithium ions released from the lithium metal electrode to form lithium fluoride (LiF), thereby suppressing dendrite growth and enhancing interfacial stability.

When using lithium metal anodes, side reactions with the electrolyte lead to dendrite formation, which causes non-uniform current distribution, electrolyte decomposition, short circuits, reduced coulombic efficiency, and shortened battery lifespan.

By forming a 1–3㎛ thick hydrophobic FGO coating layer on the separator substrate, this technology serves as a foundation for improving the maturity of secondary battery separator technology.

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Key Features:

• Hydrophobic fluorinated graphene oxide coating layer formed on the side of the separator substrate facing the lithium metal electrode
• Coating layer that reacts with lithium ions released from the lithium metal electrode to form lithium fluoride
• Separator for lithium metal batteries comprising a separator substrate and a fluorinated graphene oxide coating layer formed on one side thereof
• Coating layer structure that suppresses dendrite growth and stabilizes the interface through the formation of lithium fluoride

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