Cathode plate for all-solid-state batteries including a mesh pattern and manufacturing method thereof

All-solid-state cathode composite layer with low interfacial resistance based on compression-molded twill stainless steel mesh

This technology improves lithium-ion mobility and reduces interfacial resistance by compression-molding a metal mesh onto the surface of an all-solid-state battery's cathode composite layer, creating a micro-patterned grid that physically increases the contact area with the solid electrolyte.

In all-solid-state batteries, poor physical contact between the solid electrolyte and the electrode has historically led to high interfacial resistance, which ultimately degrades overall battery performance.

This technology involves compression-molding a 100–250 mesh twill stainless steel mesh onto a cathode slurry coated on metal foil for 5 minutes to 24 hours. This forms a mesh pattern on the surface of the cathode composite layer consisting of convex and concave sections with a width of 90–110㎛. It can be applied to cathodes for all-solid-state batteries using sulfide-based solid electrolytes, as well as next-generation electric vehicle cells featuring stacked solid electrolyte layers and lithium anodes. By simply adding a mesh compression process to existing coating lines, interfacial properties can be enhanced without the need for expensive equipment.

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Key Features:

• Preparing the cathode slurry by mixing cathode active material, solid electrolyte, conductive agent, and binder
• Manufacturing a slurry-metal composite sheet by applying the cathode slurry to a metal foil at a predetermined thickness using a doctor blade
• Compression-molding and subsequently removing a 100–250 mesh twill stainless steel mesh, where warp and weft wires cross over each other in groups of two or more
• A mesh-patterned cathode composite layer consisting of 90–110㎛ wide convex sections and concave sections with depth-to-thickness ratios that vary based on molding time

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