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Aluminum alloy anode material for seawater battery and preparation method

A technology for anode materials and seawater batteries, which is applied in the direction of battery electrodes, circuits, electrical components, etc., can solve the problem of reduced activity, and achieve the effects of negative working potential, high activity, and low self-corrosion rate

Pending Publication Date: 2020-05-22
725TH RES INST OF CHINA SHIPBUILDING INDAL CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the self-passivation characteristics of aluminum, it is easy to form a dense surface passivation film in a neutral medium, resulting in a greatly reduced activity. Therefore, the electrolytes of common aluminum-air batteries or aluminum seawater batteries mostly use strong alkaline solutions. , the purpose is to suppress the passivation of aluminum, such as Chinese invention patents CN 105140596B and CN1066763343B, etc. invented aluminum alloy anode materials with good performance in alkaline medium

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] The aluminum alloy anode material for seawater battery of the present embodiment, the mass percent of its composition is: Ga 0.1%, Zn 0.1%, Bi 0.1%, Sn 0.2%, Cd 0.2%, Pb 0.1%, Mn 0.2%, balance for Al. Aluminum ingots are selected as the Al element during the preparation of the anode, the purity of which is 99.9%, and the impurity Fe content is ≤0.07%, and the impurity Cu content is ≤0.005%. Due to the high melting point of the Mn element, AlMn15 master alloy with a relatively low melting point is selected as the raw material; the purity of the remaining components should not be lower than 99.99%;

[0030] The anode material is prepared by high-temperature smelting, and the aluminum alloy anode material is produced according to the following steps:

[0031] 1) When the smelting furnace is cold, add the Al element and Mn element in the formula dosage, and continue heating at a heating rate of 10°C / min to melt the Al element and Mn element;

[0032] 2) Then add Zn, Pb an...

Embodiment 2

[0037] The aluminum alloy anode material for seawater battery of the present embodiment has the mass percent of its composition: Ga0.02%, Zn 0.05%, Bi 0.5%, Sn 0.3%, Cd 0.01%, Pb 0.06%, Mn 0.1%, and the rest The amount is Al. The purity of the aluminum ingot is 99.9% when preparing the anode, the impurity Fe content is ≤0.07%, and the impurity Cu content is ≤0.005%.

[0038] The anode material is prepared by high-temperature smelting, and the aluminum alloy anode material is produced according to the following steps:

[0039] 1) When the smelting furnace is cold, add the Al element and Mn element in the formula dosage, and continue heating at a heating rate of 15°C / min to melt the Al element and Mn element;

[0040]2) Then add Zn, Pb and Cd elements in the formula dosage, continue to heat up to 780°C,

[0041] 3) After the raw materials in the melting furnace are completely melted, wrap the Ga, Bi, and Sn elements in the formula with aluminum foil and put them into the melti...

Embodiment 3

[0045] The aluminum alloy anode material for seawater batteries of this embodiment has the following mass percentages of components: Ga0.06%, Zn 0.2%, Bi 0.2%, Sn 0.5%, Cd 0.1%, Pb 0.02%, Mn 0.02%, and the rest The amount is Al. The purity of the aluminum ingot is 99.95% when preparing the anode, the content of impurity Fe is ≤0.02%, and the content of impurity Cu is ≤0.005%. The addition of Mn element is AlMn15 master alloy, and the purity of other components is 99.99%.

[0046] The anode material is prepared by high-temperature smelting, and the aluminum alloy anode material is produced according to the following steps:

[0047] 1) When the smelting furnace is in a cold state, add the Al element and Mn element in the formula dosage, and continue heating at a heating rate of 13°C / min to melt the Al element and Mn element;

[0048] 2) Then add Zn, Pb and Cd elements in the formula dosage, and continue to heat up to 770°C,

[0049] 3) After the raw materials in the melting fu...

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Abstract

The invention provides an aluminum alloy anode material for a seawater battery and a preparation method. The electrochemical performance of an aluminum alloy in a seawater medium is improved through amicroalloying method. According to the preparation method, firstly, activating elements Ga, Bi, Cd and Pb are added to promote an oxidation film layer on the surface of the aluminum alloy to be dissolved and strip off, the potential of an anode is remarkably and negatively moved, and the activation performance of the anode is improved; secondly, elements Sn, Zn and Mn with the high hydrogen evolution potential are added, the hydrogen evolution overpotential of the aluminum alloy is increased to some extent, the probability of hydrogen evolution corrosion of the anode is reduced, and accordingly, the current efficiency of the anode is improved; and finally, by controlling the contents of impurity elements Fe and Cu in an aluminum ingot, self-corrosion of the aluminum alloy anode is reduced, and the dissolution morphology of the aluminum alloy anode is improved. In the preparation process of the anode, by controlling the feeding sequence and technological parameters of all the components, the anode material has the negative working potential, high activity and low self-corrosion rate in the seawater medium, and the driving potential and current efficiency of the aluminum-seawater battery can be effectively improved.

Description

technical field [0001] The invention relates to an anode material for an aluminum-seawater battery, more specifically a high-activity aluminum alloy anode material and a preparation method, belonging to the field of alloy materials. The material has relatively negative working potential, high activity and low self-corrosion rate in seawater medium, and can effectively improve the driving potential and current efficiency of the aluminum-seawater battery. Background technique [0002] A seawater battery consists of an anode (positive electrode), a cathode (negative electrode) and an electrolyte (seawater). When the battery is working, the negative electrode current is generated by the anode metal losing electrons in the seawater electrolyte to become metal ions, and the dissolved oxygen in the seawater electrolyte obtains electrons on the inert electrode to undergo a reduction reaction to generate a positive electrode current. The electrolyte used in seawater batteries is nat...

Claims

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Application Information

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IPC IPC(8): C22C21/00C22C1/02C22F1/04H01M4/46
CPCC22C21/00C22C1/026C22F1/04H01M4/463Y02E60/10
Inventor 张海兵刘广义马力孙明先洪刚段体刚
Owner 725TH RES INST OF CHINA SHIPBUILDING INDAL CORP
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