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.

Description

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AI Technical Summary

Benefits of technology

This patented technology describes an improved type called Covalently Organized Chemistry (COC) that can be used for making certain types of materials with better properties such as high energy density or long lifetimes. These new compounds have been found useful in batteries made from these materials due to their ability to absorb large amounts of water without losing its structure when exposed to humid conditions during chargings cycles. Additionally, this material helps prevent damage caused by lithiums while still being able to store enough charge it needs at once. Overall, this innovation makes batteries more reliable over time and allows them to perform well even under harsh environments where they may lose power quickly after use.

Problems solved by technology

This patents discusses different types of batteries made entirely out of metals like iron and nickel, including lithium ion batteries called LIBCs. While some alternatives exist, none offer complete solutions without sacrificial effects caused by shunting electrons during charging cycles. There exists a technical solution involving replacing traditional negative pole materials with carbon nanotubbles, allowing them to absorb large amounts of charge while maintaining excellent properties over longer periods of use.

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