Method for manufacturing a solid electrolyte membrane for all-solid-state batteries, a solid electrolyte membrane for all-solid-state batteries, and an all-solid-state battery equipped with said solid electrolyte membrane

Manufacturing Process for Solvent-Free Solid Electrolyte Membranes Using Sequential UV and Thermal Dual Curing

This technology improves the mechanical properties and dimensional stability of solid electrolyte membranes by applying a slurry containing a mixture of UV-curable and heat-curable binders onto a substrate, followed by sequential primary UV curing and secondary thermal curing.

Conventional single-curing methods have limitations: UV-only curing often results in incomplete internal curing, while thermal-only curing leads to long processing times, thermal deformation, and cracking during molding. Furthermore, the use of solvents in slurries causes environmental pollution and adds unnecessary costs.

This technology involves mixing acrylate, epoxy, or thiol-based liquid UV-curable binders and epoxy, silicone, or isocyanate-based heat-curable binders with ion-conductive inorganic particles in a solvent-free state, followed by sequential curing under 100–450 nm UV light and 50–150°C heat. Applicable to roll-to-roll mass production lines for oxide, sulfide, and halide-based all-solid-state batteries, it enables the production of uniform, crack-free membranes while eliminating the need for drying processes and solvent recovery equipment.

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Key Features:

• Step of preparing a solid electrolyte slurry by mixing a liquid UV-curable binder, a heat-curable binder, and ion-conductive inorganic particles
• First step of coating the solid electrolyte slurry onto a substrate and performing UV curing at a wavelength of 100 nm to 450 nm
• Second step of thermally curing the solid electrolyte slurry at a temperature of 50°C to 150°C after the first UV curing step
• Solid electrolyte membrane disposed sequentially between an anode and a cathode, comprising a dual-cured binder and ion-conductive inorganic particles

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This invention was developed with support from the Ministry of Economy and Finance for the development of manufacturing technology for solid electrolyte membranes with an ionic conductivity of 1 mS/cm or higher and a thickness of 30 μm or less.

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