This technology utilizes a protective layer composed of a CMC polymer matrix with polar groups and LiNO3 lithium salt, placed between the lithium metal anode and the sulfide-based solid electrolyte. It prevents direct contact between the two materials and reduces interfacial resistance, thereby suppressing dendrite growth.
Lithium metal is highly reactive, and sulfide-based solid electrolytes are chemically unstable, leading to side reactions at the interface where they meet. Furthermore, the growth of lithium dendrites during charge and discharge cycles causes short circuits and limits battery lifespan.
This technology creates a 20–60㎛ thick anode protective layer by dispersing LiNO3 within a CMC polymer matrix at a weight ratio of 10:1 to 20:1, allowing the layer to serve as both an ion pathway and a physical barrier. The cell is completed by stacking an argyrodite-structured solid electrolyte layer and a composite cathode onto the protective layer. Applicable to lithium metal anode processes for automotive and cell manufacturers developing sulfide-based all-solid-state batteries, it enables the implementation of a low-cost interfacial protective layer using only water-based polymers and common lithium salts.
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