Anode for lithium secondary battery, method for manufacturing the same, and all-solid-state lithium secondary battery comprising the same

All-solid-state lithium metal anode with a crystalline Li2Se protective layer to prevent side reactions with sulfide electrolytes

This technology forms a crystalline lithium chalcogenide (e.g., Li2Se) nanostructure protective layer on the surface of a lithium metal anode. This layer prevents side reactions with sulfide-based solid electrolytes, thereby suppressing lithium dendrite growth and enhancing interface stability.

Lithium metal anodes and sulfide-based solid electrolytes are highly reactive, leading to side reactions during charging and discharging. This has historically caused dendrite growth and porous lithium deposition, resulting in battery short circuits and reduced cycle life.

This technology reacts chalcogen vapor on the lithium metal surface to form a crystalline Li2Se thin film in the form of nanorods or nanowalls. This protective layer ensures chemical bonding and stability with sulfide-based solid electrolytes. It can be applied to all-solid-state lithium metal batteries for electric vehicles and high-capacity next-generation cells, providing a solution that significantly reduces the risk of interface short circuits while utilizing lithium metal anodes.

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Key Features:

• An anode comprising a lithium metal layer and a protective layer, which is a lithium chalcogenide layer disposed on the lithium metal layer
• A cathode of a lithium secondary battery positioned opposite the anode with a sulfide-based solid electrolyte disposed therebetween
• A sulfide-based solid electrolyte disposed between the protective layer and the cathode to transport lithium ions
• A lithium chalcogenide layer where the lithium chalcogenide is Li2Se and is in the form of a crystalline thin film having (220) and (311) planes

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