Method for preparing air electrode, air electrode and battery comprising air electrode

Abstract

The invention discloses an air electrode, a preparation method of the air electrode and an electrochemical-chargeable zinc-air battery comprising the air electrode. The air electrode increases the contact site density of three-phase reaction of oxygen, an alkaline electrolyte and a solid catalyst in an electrode reaction area, provides a charge transfer reaction network for the oxidation reaction and reduction reaction of oxygen in the whole electrode three-dimensional space, and reduces charge transfer resistance, so that the energy density, power density and capacitive properties of the battery are improved, and the degree of polarization of the charging and discharging process is greatly reduced. The preparation process of the air electrode is simple, a high-temperature calcination and hot-pressing molding process technology is adopted, mass production is facilitated; the prices of used raw materials are low, and the preparation process is environmentally-friendly. The air electrode and the battery comprising the air electrode are economical and practical, have good performance and have important application prospects.

Description

technical field [0001] The invention belongs to the technical field of battery manufacture, and in particular relates to a preparation method of an air electrode, an air electrode and a battery including the air electrode. Background technique [0002] Metal-air batteries have the advantages of high energy density, high power density, low price, light weight, and no special storage of raw materials due to the use of air materials in the positive electrode, so they have been widely studied. At present, the metal-air batteries that have been studied more mainly include lithium-air batteries and zinc-air batteries. Among them, the theoretical capacity density of the lithium-air battery reaches 3862mAh / g, and the energy density reaches 11972Wh / kg. Zinc-air batteries have the advantages of high energy density, long charge-discharge cycle life, stable working voltage, large capacity, economical and practical, safe and environmentally friendly. Therefore, lithium-air batteries an...

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Problems solved by technology

[0004] To solve this technical problem, the solution mainly focuses on the development of high-efficiency bifunctional catalysts, but the development of high-performance catalysts still cannot make metal-air batteries successfully move towards large-scale industrial applications.

[0005] In the existing air electrode, the current collector 201, the diffusion layer 202 and the catalytic layer 203 are clearly separated from each other, such as figure 2 As shown, it is unfavorable for the oxygen in the air and the hydroxide in the alkaline electrolyte to fully contact with the solid catalyst and undergo electrocatalytic reaction, which often produces a high overpotential, resulting in electrochemical performance that cannot meet the actual needs.

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