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A kind of preparation method of anode aluminum alloy for air battery and air battery

An air battery and aluminum alloy technology, applied in the direction of fuel cell half-cells and primary battery half-cells, battery electrodes, circuits, etc., can solve the problem of limiting the application of aluminum-air batteries, affecting the electrochemical activity of aluminum, and difficult to take into account the open circuit Voltage and other issues, to achieve the effect of reducing hydrogen evolution corrosion, reducing self-corrosion rate, and improving intergranular morphology

Active Publication Date: 2021-07-27
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, 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

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 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 percent of the control elements is: Ti5%, B0.2%, La1%, and the balance is Al;

[0022] Heat up to 780°C, melt the high-purity aluminum in a resistance furnace until soft, add the covering agent KCl, until the aluminum is completely melted, raise the temperature to 800°C, use a graphite bell jar to melt the pre-mixed KBF 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] Casting the melt into an ingot yields a grain refiner.

[0024] (2) Preparation of aluminum alloy plate

[0025] Take by weighing Zn0.05%, Ga0.2%, Sn0.02%, In0.08%, Bi0.15%, Mg0.8%, Ce0.2%, the grain refiner 0.4 that step (1) makes %, with a balance of 99.9% of ...

Embodiment 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 percent of the control elements is: Ti8%, B0.5%, La0.8%, and the balance is Al;

[0030] Heat up to 780°C, melt the high-purity aluminum in a resistance furnace until soft, add the covering agent KCl, until the aluminum is completely melted, raise the temperature to 800°C, use a graphite bell jar to melt the pre-mixed KBF 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] Casting the melt into an ingot yields a grain refiner.

[0032] (2) Preparation of aluminum alloy plate

[0033] Take by weighing Zn0.1%, Ga0.4%, Sn0.05%, In0.05%, Bi0.1%, Mg0.5%, Ce0.1%, the grain refining agent 0.3 that step (1) makes %, with a balance of 99...

Embodiment 3

[0036] Step (1) is identical with embodiment 1, and step (2) is:

[0037] Take by weighing Zn0.05%, Ga0.2%, Sn0.02%, In0.08%, Bi0.15%, Mg0.8%, Ce0.2%, the grain refiner 0.4 that step (1) makes %, with a balance of 99.9% of high-purity aluminum; aluminum is melted at 780°C, added with Zn, Ga, Sn, In, Bi, Mg, Ce for melting, heated to 850°C for melting, then cooled to 800°C, and added to step (1 ) refined grain refiner, cast into slab, heat up to 500°C at 15°C / min, anneal for 15h, cool to room temperature, remove surface oxide layer, roll into 1mm aluminum plate, anneal at 400°C for 60min , after the annealing is completed, cool to room temperature to obtain a finished aluminum plate.

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

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PUM

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Abstract

The present application discloses a method for preparing an anode aluminum alloy for an air battery and the air battery. The method includes: weighing industrially pure aluminum, high-purity lanthanum, KBF 4 、K 2 TiF 6 , the weight percentage of the control elements is: Ti5~10%, B0.1~0.5%, La0.5~1%, and the balance is Al; completely melt the industrial pure aluminum, control the temperature above 800℃, and use graphite bell jar Pre-mixed KBF 4 、K 2 TiF 6 Press the powder into the aluminum melt and stir evenly, keep the temperature for 15-30 minutes, then add high-purity lanthanum and stir evenly, keep the temperature for 20-40 minutes, and fill the covering agent during the stirring process; cast the melt into ingots to obtain the grain refiner; Weigh Zn0.05~0.2%, Ga0.2~0.4%, Sn0.01~0.05%, In0.05~0.1%, Bi0.1~0.2%, Mg0.5~1%, Ce0.1 by weight percentage ~0.3%, the grain refiner is 0.3~0.5%, and the balance is aluminum; melt aluminum, add Zn, Ga, Sn, In, Bi, Mg, Ce to melt, add grain refiner to refine, and cast Cast billets, annealed, rolled into aluminum plates, and then annealed. The annealing time is 30-40min / mm. The prepared material is used as an anode of an aluminum-air battery, which can increase the open circuit potential and reduce the self-corrosion rate.

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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Patent Type & Authority Patents(China)
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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