Air battery anode aluminum alloy preparation method and air battery

Abstract

The invention discloses an air battery anode aluminum alloy preparation method and an air battery. The method comprises the following steps that industrial pure aluminum, high-purity lanthanum, KBF4 and K2TiF6 are weighed, and the weight percentage of the elements is controlled to be as follows: 5%-10% of Ti, 0.1%-0.5% of B, 0.5%-1% of La, and the balance Al; the industrial pure aluminum is completely melted, a temperature is controlled to be 800 DEG C or above, KBF4 and K2TiF6 powder which is uniformly stirred in advance is pressed into aluminum melt by using a graphite bell jar for uniformlystirring, the temperature is kept constant for 15-30 minutes, then the high-purity lanthanum is added, uniform stirring is conducted, the temperature is kept for 20-40 minutes, and a covering agent is added in a stirring process; the melt is cast into a cast ingot to obtain a grain refiner; the following components are weighed in percentage by weight: 0.05%-0.2% of Zn, 0.2%-0.4% of Ga, 0.01%-0.05% of Sn, 0.05%-0.1% of In, 0.1%-0.2% of Bi, 0.5%-1% of Mg, 0.1%-0.3% of Ce, 0.3%-0.5% of the grain refiner and the balance aluminum; and the aluminum is melted, the Zn, the Ga, the Sn, the In, the Bi,the Mg and the Ce are added for smelting, then the grain refiner is added for refining, casting into a casting blank is conducted, annealing is conducted, rolling into an aluminum plate is conducted,annealing is conducted again, and the annealing time is 30-40 min / mm. The prepared material is used as an anode of an aluminum air battery, so that an open circuit potential can be improved, and theself-corrosion rate can be reduced.

Description

technical field [0001] The present application relates to the technical field of metal fuel cells, in particular to a method for preparing an anode aluminum alloy for an air battery and the air battery. Background technique [0002] Aluminum has high electrochemical equivalent, high specific energy, and abundant resources, making aluminum-air batteries a research hotspot for metal fuel cells. However, aluminum is extremely prone to self-corrosion and hydrogen evolution corrosion in alkaline electrolytes, and a dense oxide film is easily formed on the surface, resulting in anode passivation and affecting the electrochemical activity of aluminum. [0003] The above problems can be overcome to a certain extent by adding Ga, In, Sn and other metal elements. The main principle is to form low-melting point compounds, destroy the passivation film on the aluminum surface, or reduce self-corrosion by increasing the hydrogen evolution potential. These methods It is difficult to take ...

AI Technical Summary

Problems solved by technology

However, aluminum is extremely prone to self-corrosion and hydrogen evolution corrosion in alkaline electrolytes, and a dense oxide film is easily formed on the surface, resulting in anode passivation and affecting the electrochemical activity of aluminum.

[0003] The above problems can be overcome to a certain extent by adding Ga, In, Sn and other metal elements. The main principle is to form low-melting point compounds, destroy the passivation film on the aluminum surface, or reduce self-corrosion by increasing the hydrogen evolution potential. These methods It is difficult to take into account the open circuit voltage while reducing the corrosion of the aluminum plate, or it is easy to aggravate the self-corrosion of the aluminum plate while increasing the activity of the aluminum plate, which limits the application of aluminum-air batteries