This technology enables the manufacturing of electrolyte sheets via slurry casting without high-temperature sintering. By mixing a polymer binder with polar functional groups (PVdF) and an ionic liquid (BMIM-TFSI) in an optimal ratio, it secures ion conduction paths between oxide-based solid electrolyte particles and enhances interfacial adhesion.
Conventional pellet-type solid electrolytes suffer from low mechanical stability, making large-area processing difficult and necessitating high-temperature sintering. Even when converted into sheet form, polymer binders have historically reduced ionic conductivity and increased interfacial resistance with electrodes.
This technology involves mixing an oxide-based solid electrolyte (Li1+x+yAlxTi2-xSiyP3-yO12), an ionic liquid (BMIM-TFSI), and a PVdF binder in a weight ratio of 7:1.5:1.5 to 8:1:1 to form a 60–70㎛ thick sheet. This achieves an ionic conductivity of 1×10^-4 to 2×10^-4 S/cm and a peel strength of 0.4–0.5 N. Suitable for roll-to-roll mass production of all-solid-state batteries and next-gen cells using lithium metal anodes, it provides thin, easy-to-handle electrolyte membranes without sintering furnace equipment.
N/A
