Nanofiber diaphragm as well as preparation method and application thereof

By introducing porous organic cages and polymer blending and inorganic ceramic coatings in zinc -ion battery diaphragm, the short -circuit problem caused by zinc branched crystal puncture has been solved, and the mechanical strength and cycle life of the battery are significantly improved.

CN119381688AActive Publication Date: 2025-01-28DALIAN INSTITUTE OF CHEMICAL PHYSICS CHINESE ACADEMY OF SCIENCES
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Patent Information

Application Number
CN202310921005.7
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2023-07-25
Publication Date
2025-01-28
Estimated Expiration
2043-07-25

AI Technical Summary

Technical Problem

Zinc ion batteries are prone to form rough zinc dendrites during charging and discharging, resulting in short circuits in the battery. The existing separators have poor mechanical properties and pore size, making it difficult to effectively prevent dendrites from puncture.

Method used

The porous organic cage and polymer blended, combined with inorganic ceramic coatings, to prepare nanofibrical diaphragm. This diaphragm is prepared through electrostatic spinning technology. Pores of porous organic cages provide good solution processability and mechanical strength, while inorganic ceramic coatings improve the mechanical strength and the ability to resist branches.

Benefits of technology

It improves the mechanical strength and pore rate of the diaphragm, can effectively suppress the growth of zinc branches, prevent short circuit of the battery, and extend the cycle life of zinc ion battery.

✦ Generated by Eureka AI based on patent content.

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Patent Text Reader

Abstract

The invention discloses a nanofiber diaphragm as well as a preparation method and application thereof. The thickness is 80-200 [mu] m; comprising a diaphragm and an inorganic ceramic material coated on the surface of the diaphragm, the separator contains a porous organic cage. The good solution processability of the porous organic cage and the compatibility of the porous organic cage with the polymer provide powerful conditions for dispersion of the porous organic cage in the polymer, so that hybridization of the porous organic cage and the polymer at the molecular level is promoted, and the porous organic cage hybrid nanofiber diaphragm is obtained. The electrostatic spinning porous organic cage hybrid nanofiber diaphragm has high porosity, electrolyte absorptivity and hydrophilicity, can be combined with a large number of water molecules, and is beneficial to reducing corrosion of a zinc negative electrode in contact with an aqueous electrolyte; the zinc oxide has extremely high mechanical strength and can induce zinc ions to be uniformly deposited, so that the growth of zinc dendrites is effectively inhibited; the inorganic ceramic coating prevents the diaphragm from being punctured, improves the electrochemical performance and cycle life of the aqueous zinc ion battery, and has huge application potential in the field of aqueous zinc ion battery diaphragms.
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Citation Information

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