Method For Preparing Composite Solid Electrolyte And Composite Solid Electrolyte Prepared Thereby

Abstract: The present invention relates to a method for preparing a composite solid electrolyte and a composite solid electrolyte prepared by the preparation method. The preparation method may comprise the steps of: (S1) preparing a mixed solution including a polyethylene oxide (PEO) based copolymer containing a cross linkable functional group and a ceramic compound; (S2) unwinding a substrate by using an unwinder and supplying same to a transfer path; (S3) forming a coating film by applying the mixed solution onto the substrate; (S4) transferring the substrate with the coating film formed thereon to a dry section and drying same to form a polymer film; (S5) transferring the polymer film to a vapor deposition section followed by vapor deposition of a polar solvent thereon to form a composite solid electrolyte layer; and (S6) recovering the substrate including the composite solid electrolyte layer by winding with a rewinder.

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