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Aluminum based anodes and process for preparing the same

Inactive Publication Date: 2012-08-02
BAR ILAN UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the use of such anodes is limited due to the corrosion of the anode, which occurs mainly at open circuit voltage and at low current density by reaction of the aluminum anode (Al-anode) with the electrolyte.
Such corrosion causes the consumption of the Al-anode, without the generation of electrical power, thus causing the deterioration of the battery and highly limiting the shelf life thereof.
However, these attempts were not very successful.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

Corrosion Rate after SSHT Before Decomposition

[0011]1.5 kg of Al—Mg 2.5% alloy was smelted from 1.462 kg of aluminum (purity 99.99%) and 0.038 kg of magnesium (purity 99.999%) in a graphite crucible in an induction furnace under a protective atmosphere. Magnesium and other alloying elements were wrapped up in Aluminum foil and plunged into already melted Al. The melt was poured out into a steel mould of 150×15×260 size. Before casting the melt was vigorously stirred by graphite rod. The same procedure (besides the alloy's composition) was used for smelting of all the mentioned below Al base alloys.

[0012]Casting stress relief annealing was carried out at 350° C. for two hours, cooled down to room temperature and then the strips were rolled in a duo rolling mill to a thickness of 3.5 mm. This annealing procedure is optional and may be performed to reduce internal stress and to homogenize the structure. SSHT of the strips was carried out in an electric batch type furnace with circulati...

example 2

Corrosion Rate after Artificial Aging

[0017]The alloys prepared according to the procedure detailed above were additionally subjected to artificial aging. The corrosion rate .vs. the time of aging of the various alloys is shown below in Table II.

TABLE IIAgingTime of aging / CorrosionAlloy composition(° C.)rate (h / (mg / cm2min))Al—Mg 2.5%15090 / 0.47; 175 / 0.4; 220 / 0.42Al—Mg 3.0%150170 / 0.38;Al—Mg 4.5%—Ga 0.5%15090 / 0.58; 190 / 0.52Al—Mg 6%15090 / 0.60; 175 / 0.49Al—Mg 2.7%—Si 0.7%16090 / 0.77; 175 / 0.63Al—Mg 2.1—Ge 0.6—Ga16090 / 0.71; 175 / 0.590.3Al—Si 1.2%19090 / 0.79; 175 / 0.65

example 3

Comparison Between Corrosion Rates when Using Artificial Aging and Plastic Deformation

[0018]1.5 kg of an Al—Mg 3.4% alloy was prepared according to the procedure described in Example 1. The ingot of size 150×15×260 mm was rolled to the strips having thickness 4.5 mm. The solid solution heat treatment for these strips was carried out as follows: heating up to 415° C., maintaining at this temperature for 4 hours and quenching in water at room temperature. After quenching the strips were rolled from the thickness of 4 mm to 1.1-1.2 mm and then some samples (Group A) were electrochemically tested and some of them (Group B) were subjected to aging process at 150° C., before electrochemical testing.

[0019]The results show that the average corrosion rate for Group A samples was 0.33 mg / cm2·min The results of the corrosion test for samples of Group B are summarized in Table III

TABLE IIITime of aging, h067.5133.5200263Corrosion rate, mg / cm2 / min0.340.340.330.320.34

[0020]From comparing the resu...

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Abstract

Disclosed is a method for preparing an aluminum-based anode, including at least one alloying element, prepared using solid solution heat treatment, in addition to plastic deformation, artificial aging, or a combination thereof.

Description

BACKGROUND OF THE INVENTION[0001]Aluminum is known to have a relatively high electrochemical capacity, and therefore, is highly attractive for use as an anode in batteries, including aluminum-air batteries, in which the aluminum reacts with oxygen from the air. However, the use of such anodes is limited due to the corrosion of the anode, which occurs mainly at open circuit voltage and at low current density by reaction of the aluminum anode (Al-anode) with the electrolyte. Such corrosion causes the consumption of the Al-anode, without the generation of electrical power, thus causing the deterioration of the battery and highly limiting the shelf life thereof.[0002]Several attempts have been made to suppress the corrosion of the Al-anodes, including changing the metallurgical properties of the Al-anode and adding corrosion inhibitors to the electrolyte. One such attempt is that of changing the metallurgic properties of the anode by alloying the Al with other elements. However, these a...

Claims

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Application Information

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IPC IPC(8): C22F1/04C22C21/00
CPCC22C21/02C22C21/06C22C21/08H01M4/463C22F1/043C22F1/047C22C21/00C22F1/04Y02E60/10
Inventor KHASIN, ERNSTZABAN, ARIE
Owner BAR ILAN UNIVERSITY
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