Double-coated diaphragm applied to lithium-selenium disulfide battery and preparation method and application thereof

Abstract

The invention discloses a double-coated diaphragm applied to a lithium-selenium disulfide battery and a preparation method and an application thereof and belongs to the technical field of a new material. The method comprises steps that 1), 1,3,6,8-tetra(4-formaldehyde phenyl)anthracene, p-phenylenediamine, dioxane and acetic acid solution are taken to achieve reaction to obtain PA-COF, which is araw material of coating A; 2), the PA-COF obtained in the step 1), water binder and n-propanol water are thoroughly mixed to obtain slurry A; 3), TiO2, conductive carbon black, water binder and n-propanol aqueous solution are uniformly and fully mixed to obtain slurry B; and 4), the slurry A and the slurry B are respectively applied to both sides of the battery diaphragm, dried and cut into a wafer to obtain a double-coated diaphragm. The method is advantaged in that the double-coated diaphragm is utilized in the lithium-selenium disulfide battery having surface loading of 2mg/cm<2>, the chemisorption effect of TiO2 effectively inhibits generation of the shuttling effect and the protection effect of a covalent organic framework on a lithium negative electrode to avoid generation of lithiumdendrites, and cycle stability of the battery and the specific capacity of the battery are effectively improved.

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