Air battery anode aluminum alloy preparation method and air battery

An air battery and aluminum alloy technology, which is applied to fuel cell-type half-cells and primary battery-type half-cells, battery electrodes, circuits, etc. It can reduce the corrosion of hydrogen evolution, reduce the self-corrosion rate, and improve the intergranular morphology.

Active Publication Date: 2020-08-21
HUNAN SEIRIOS NEW MATERIAL TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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, des

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0019] Example 1

[0020] (1) Preparation of grain refiner

[0021] Weigh high-purity aluminum with a purity of 99.9%, lanthanum with a purity of 99.99%, and KBF 4 , K 2 TiF 6 , The weight percentages of the control elements are: Ti5%, B0.2%, La1%, and the balance is Al;

[0022] Raise the temperature to 780℃, melt the high-purity aluminum in a resistance furnace until it becomes soft, add the covering agent KCl, until the aluminum is completely melted, raise the temperature to 800℃, use the graphite bell jar to mix the KBF beforehand 4 , K 2 TiF 6 Press the powder into the aluminum melt and stir evenly, keep the temperature for 30 minutes, then add lanthanum and stir evenly, keep the temperature for 30 minutes, and add KCl during the stirring process;

[0023] The melt is cast into an ingot to obtain a grain refiner.

[0024] (2) Preparation of aluminum alloy plate

[0025] Weigh Zn0.05%, Ga0.2%, Sn0.02%, In0.08%, Bi0.15%, Mg0.8%, Ce0.2%, and the grain refiner obtained in step (1) 0.4 ...

Example Embodiment

[0027] Example 2

[0028] (1) Preparation of grain refiner

[0029] Weigh high-purity aluminum with a purity of 99.9%, lanthanum with a purity of 99.99%, and KBF 4 , K 2 TiF 6 , The weight percentages of control elements are: Ti8%, B0.5%, La0.8%, and the balance is Al;

[0030] Raise the temperature to 780℃, melt the high-purity aluminum in a resistance furnace until it becomes soft, add the covering agent KCl, until the aluminum is completely melted, raise the temperature to 800℃, use the graphite bell jar to mix the KBF beforehand 4 , K 2 TiF 6 Press the powder into the aluminum melt and stir evenly, keep the temperature for 30 minutes, then add lanthanum and stir evenly, keep the temperature for 30 minutes, and add KCl during the stirring process;

[0031] The melt is cast into an ingot to obtain a grain refiner.

[0032] (2) Preparation of aluminum alloy plate

[0033] Weigh Zn0.1%, Ga0.4%, Sn0.05%, In0.05%, Bi0.1%, Mg0.5%, Ce0.1%, and the grain refiner obtained in step (1) 0.3 %, t...

Example Embodiment

[0035] Example 3

[0036] Step (1) is the same as Example 1, and step (2) is:

[0037] Weigh Zn0.05%, Ga0.2%, Sn0.02%, In0.08%, Bi0.15%, Mg0.8%, Ce0.2%, and the grain refiner obtained in step (1) 0.4 %, the balance is 99.9% high-purity aluminum; melt the aluminum at 780℃, add Zn, Ga, Sn, In, Bi, Mg, Ce to smelt, heat up to 850℃ for smelting, then cool down to 800℃, add step (1 ) The obtained grain refiner is refined, cast into a cast slab, heated at 15°C / min to 500°C, annealed for 15h, cooled to room temperature, after removing the surface oxide layer, rolled into 1mm aluminum plate, annealed at 400°C for 60min After annealing, it is cooled to room temperature to obtain the finished aluminum plate.

[0038] The finished aluminum plate is tested for self-corrosion in 4M KOH electrolyte, the self-corrosion rate is 2.8mg / cm 2 ·H, with the aluminum plate as the anode, the air battery is assembled, and the open circuit potential is 1.98V.

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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 ...

Claims

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Application Information

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IPC IPC(8): C22C21/06C22C1/02C22C1/06C22F1/047H01M4/90H01M4/88H01M12/06
CPCC22C1/026C22C1/06C22C21/06C22F1/047H01M4/88H01M4/9041H01M12/06
Inventor 易祖成吴辉
Owner HUNAN SEIRIOS NEW MATERIAL TECH CO LTD
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