High-performance air cathode catalyst layer suitable for metal air battery

Abstract

The invention discloses a high-performance air cathode catalyst layer suitable for a metal air battery, which is prepared by the following steps: 1) preparing inner layer ink which is catalytic active material ink; 2) preparing outer-layer ink, wherein the outer-layer ink is conductive gel ink; 3) designing a functional grid pattern; and 4) selecting electrofluid printing equipment with a coaxial spray head, and performing coaxial printing by adopting the inner-layer ink and the outer-layer ink prepared in the step 1) and the step 2) according to the functional grid pattern designed in the step 3) to form a grid pattern catalyst layer of a porous conductive gel coated catalytic active material. And constructing a flexible carbon-based gel coated rigid active material grid structure catalyst layer based on electrohydrodynamics printing. Through coaxial printing, the ink flow of the outer-layer gel and the ink flow of the inner-layer active material are accurately regulated and controlled, and the orderly dispersion of the active material on the micro-nano scale is controlled; and a functional grid structure is constructed to improve the mechanical property of the catalyst layer.

Description

technical field [0001] The present invention specifically relates to a high-performance air cathode catalytic layer suitable for metal-air batteries. Background technique [0002] In recent years, flexible electronics and applications (such as flexible sensors, wearable medical products, etc.) have been widely used in many fields due to their good flexibility and portability, but flexible power sources have become a bottleneck that hinders the development of flexible electronics. Metal (such as aluminum, magnesium, zinc, etc.) air batteries have the advantages of high discharge capacity, high energy density, light weight, and environmental friendliness, and are one of the most competitive flexible power sources. Metal-air batteries generally consist of an air cathode, an electrolyte, and a metal anode. Since flexible metal batteries are subject to bending and other working conditions during use, they must have both bending-resistant mechanical properties. The metal negativ...

AI Technical Summary

Problems solved by technology

Although the porous gel catalytic layer can alleviate the peeling and falling off of the catalytic active material in the process of mechanical strain, there are still two deficiencies in the following two aspects: First, the porous gel-loaded catalytic active material is usually catalyzed before the gelation process. The material is embedded in the gel, however, the self-clustering phenomenon of the catalytic material severely reduces the available active sites for the active material and does not take full advantage of the high specific surface area of ​​the porous gel framework

Second, the fatigue mechanical strain will lead to the accumulation of dislocations at the interface between the substrate and the functional film on the surface, which will cause bumps and cracks in the functional film. The fatigue bending and torsion of the catalytic layer will easily form channel cracks, resulting in local failure effects. The stability of the catalytic layer

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