A coating, a coated zinc negative electrode and a method of making and using the same

CN119674072BActive Publication Date: 2026-07-07DALIAN INSTITUTE OF CHEMICAL PHYSICS CHINESE ACADEMY OF SCIENCES
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
DALIAN INSTITUTE OF CHEMICAL PHYSICS CHINESE ACADEMY OF SCIENCES
Filing Date
2023-09-20
Publication Date
2026-07-07

AI Technical Summary

Technical Problem

The inorganic coating of existing zinc anodes is brittle and easily fractured, while the organic coating has poor ionic conductivity and is easily dissolved, leading to the formation of zinc dendrites and side reactions, which affect the cycle stability and coulombic efficiency of zinc-ion batteries.

Method used

An organic-inorganic hybrid coating is used, combining Nafion film and inorganic quantum dots to form a coating with a thickness of 1-80 μm. By forming an organic-inorganic hybrid coating on the surface of the zinc anode, the large specific surface area and semiconductor structure of quantum dots are used to stabilize the zinc anode, thereby improving electrochemical activity and electron transport.

Benefits of technology

It significantly improves the cycle performance of zinc-ion batteries, reduces dendrites and side reactions, and extends the service life of zinc anodes, with a cycle life of over 1000 hours.

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Abstract

The application discloses a coating, a zinc negative electrode with the coating and a preparation method and application thereof. The coating is a Nafion film containing inorganic quantum dots; wherein the mass fraction of the inorganic quantum dots is greater than 50%. The thickness of the coating is 1-80 microns. The coating has the physical isolation of an organic layer and the high electrochemical activity of an organic layer, reduces dendrites and side reactions, and greatly improves the cycle performance of a zinc ion battery. The coating has the advantages of both the organic layer and the inorganic layer. The Nafion film is composed of hydrophilic and hydrophobic regions and has been proved to play an active role in zinc plating / demetalization and dendrites. The quantum dots have a large specific surface area, a semiconductor structure, small size quantum confinement and edge effects, are stable and easy to form composites, doped and functionalized. The quantum dot modified electrode has better electrochemical activity, conductivity and increased electron transmission path.
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