Flexible modified oxide electrolyte membrane as well as preparation method and application thereof

The invention provides a flexible modified oxide electrolyte membrane as well as a preparation method and application thereof. The preparation method comprises the following steps: a) mixing an N-methyl pyrrolidone dispersion liquid of a solid electrolyte with polyamino acid, carrying out a modification reaction, and drying to obtain a modified oxide; the polyamino acid is selected from one or more of poly-DL-alanine, poly-L-histidine, polyglycine, poly-L-arginine and poly-DL-ornithine, and the polyamino acid is selected from one or more of poly-DL-alanine, poly-L-histidine, poly-glycine, poly-L-arginine And b) mixing the modified oxide obtained in the step a) with a lithium salt, and pressing to obtain the flexible modified oxide electrolyte membrane. Compared with the prior art, the preparation method provided by the invention has the advantages that the solid electrolyte is modified by adopting the polyamino acid, and specific process steps are matched, so that relatively good overall interaction is realiz