Air electrode of multi-layer sintering structure and its manufacturing method

Abstract

An air electrode, executes the multilayer sintering structure, is composed of at least one layer of base material, two layers of diffused layer and an activating layer coincidence. The base material is the current collector of the air electrode and is made of the metal gauze or metal blister gauze, the upper and the lower sides respectively superpose at least a diffused layer sintered by hydrophobicity carbon material, superpose at least a activating layer outside the diffused layer, every activating layer is sintered by hydrophilicity carbon material adhered with transition metal oxide catalysis; this air electrode can be applied to zinc air battery, negative pole of firing battery or capacitance, especially when applied to the negative pole of zinc air battery, it can avoid the external air influence on the electrolyte in the zinc air battery, in the dry environment, it can maintain the water ratio of zinc positive pole of air battery more than one month, and maintain the stable electric performance.

Description

technical field [0001] The present invention relates to an air electrode constituting a multi-layer sintered structure and its preparation method, especially a novel air electrode which can be used as the cathode of a zinc-air battery and can prevent the electrolyte inside the zinc-air battery from being affected by the external air environment. electrode structure. Background technique [0002] Zinc-air batteries (Zn / Aircell), which use oxygen molecules in the air as cathode reactants, have a wide range of applications due to their high capacity specific energy (Specific Energy) and stable discharge voltage output, including automotive batteries. , and batteries for hearing aids, etc., can use zinc-air batteries as the power supply source. In addition, they have the advantages of environmental protection and low price, and have been regarded as a substitute for alkaline batteries. [0003] This zinc-air battery uses metal zinc (Zn) as the anode, and the cathode uses oxygen...

AI Technical Summary

Problems solved by technology

[0005] However, this zinc-air battery must be provided with gas channels so that air can enter, so the shell of the zinc-air battery cannot be sealed and must be made into a semi-open structure

However, this semi-open structure will cause the zinc-air battery to be very susceptible to the influence of the external air environment, hinder the performance of the zinc-air battery, and shorten the service life of the zinc-air battery

[0006] In particular, the common air electrode structure currently used in zinc-air batteries uses a single-layer sintered structure, which has the disadvantage that the moisture content of the internal zinc anode cannot be stored for a long time

If the external air environment is a high-humidity environment, moisture will penetrate the air electrode of the zinc-air battery and enter the interior of the zinc-air battery. This phenomenon will cause electrolyte dilution and cause a drop in discharge voltage; otherwise, If the external air environment conditions are low humidity, the electrolyte inside the zinc-air battery will lose moisture through the air electrode, which will cause the electrolyte to dry up and cause the battery to fail

Images