Aluminum pole plate material for aluminum-air battery, aluminum pole plate for aluminum-air battery, and preparation method

Abstract

The invention relates to an aluminum pole plate material for an aluminum-air battery, an aluminum pole plate for an aluminum-air battery and a preparation method. The material uses aluminum as the main raw material, and also includes rare earth oxides and indium oxides, wherein the rare earth oxides can be oxides of lanthanide elements, and the mass percentage in the raw materials can be 0.015%-0.03%. The mass percentage of indium oxide in the raw material may be 0.01%-0.025%, and the mass percentage of aluminum in the raw material may generally not be lower than 99.95%. The above-mentioned materials are used for the aluminum pole plate, which is in the form of a plate or a granular aggregate, and the particles forming the granular aggregate are loaded in a plate-shaped container. The preparation method is that the various raw materials are melted and mixed at high temperature, and then pressed into a plate-like or granular material, and then the corresponding aluminum pole plate is prepared. The invention improves the characteristics of the aluminum pole plate and is suitable for using sodium chloride solution as the electrolyte of the battery.

Description

technical field [0001] The invention relates to an aluminum pole plate material for an aluminum-air battery, an aluminum pole plate for an aluminum-air battery prepared with the material and a preparation method for the pole plate, and belongs to the technical field of aluminum-air batteries. Background technique [0002] Aluminum-air batteries have a series of advantages such as high specific energy, long life, safety and reliability, and environmental friendliness. The negative electrodes of traditional aluminum-air batteries are mainly made of high-purity aluminum. Aluminum itself is an extremely active metal. When its When exposed to the air, a dense oxide film will be formed on the surface, and an oxide film will also be formed during the electrode polarization process of aluminum, resulting in the defect of high resistance of the oxide film. In addition, the negative electrode of the traditional aluminum-air battery also has a high corrosion rate (usually 76×10 - 3 m...

AI Technical Summary

Problems solved by technology

[0002] Aluminum-air batteries have a series of advantages such as high specific energy, long life, safety and reliability, and environmental friendliness. The negative electrodes of traditional aluminum-air batteries are mainly made of high-purity aluminum. Aluminum itself is an extremely active metal. When its When exposed to the air, a dense oxide film will be formed on the surface, and an oxide film will also be formed on aluminum during the electrode polarization process, resulting in the defect of high resistance of the oxide film

In addition, the negative electrode of the traditional aluminum-air battery also has a high corrosion rate (usually 76×10 - 3 mm / a), weak deoxidation ability (usually <2.6ppm) and low electrochemical activity (usually α=1-3) and other defects

At the same time, due to the existence of these defects, aluminum-air batteries need to use potassium hydroxide (KOH) or sodium hydroxide (NaOH) aqueous solutions as electrolytes. If low-cost, safe and easy-to-use sodium chloride aqueous solutions are used as electrolytes, Unable to meet the actual use requirements