Nanocrystalline aluminum material, preparation method and application thereof, and aluminum air fuel cell

A fuel cell and nanocrystalline aluminum technology, applied in the field of air fuel cells, can solve the problems of hindering the commercial application of aluminum air fuel cells, increasing the internal electrical loss of the battery, excessive consumption of negative electrode materials, etc., and reducing the hydrogen evolution rate and energy density. Improves and improves the effect of uniformity

Inactive Publication Date: 2021-08-06
BEIHANG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] However, the aluminum-air fuel cell will generate hydrogen due to the corrosion of the aluminum anode during the discharge process, which will not only lead to excessive consumption of the anode material, but also increase the electrical loss inside the battery, thus seriously hindering the commercial application of the aluminum-air fuel cell. , and the discharge efficiency is not high, less than 50%
But the effect is not good, there is still the problem of high hydrogen evolution rate

Method used

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  • Nanocrystalline aluminum material, preparation method and application thereof, and aluminum air fuel cell
  • Nanocrystalline aluminum material, preparation method and application thereof, and aluminum air fuel cell
  • Nanocrystalline aluminum material, preparation method and application thereof, and aluminum air fuel cell

Examples

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preparation example Construction

[0021] The invention provides a method for preparing a nanocrystalline aluminum material, comprising the following steps:

[0022] Perform equal-channel angular extrusion on pure aluminum or aluminum alloy samples to obtain nanocrystalline aluminum materials;

[0023] The conditions of the equal-channel angular extrusion include: ψ is 30-70°, Φ is 90°, the number of extrusion passes is 5-10, and the extrusion pressure is 50-90T;

[0024] The diameter of the pure aluminum or aluminum alloy sample is 10-100 mm.

[0025] In the present invention, the ψ of the equal channel angular extrusion is preferably 30°, the number of extrusion passes is preferably 7, and the extrusion pressure is preferably 70T.

[0026] The present invention has no special limitation on the specific method of the equal-channel angular extrusion, and the method of equal-channel angular extrusion well known to those skilled in the art can be used; the present invention has no special limitation on the devic...

Embodiment 1

[0035] High-purity aluminum samples (20 mm in diameter) were subjected to equal-channel angular extrusion, with ψ being 30° and Φ being 90°, and the extrusion passes were 5 to 10 times, and the extrusion pressure was 50T to obtain nanocrystalline aluminum materials.

[0036] The grain size of the nanocrystalline aluminum material prepared in Example 1 was tested, and the results are shown in Table 1. It can be seen from Table 1 that the grain size of the prepared nanocrystalline aluminum material is 90-220 nm.

[0037] The grain size of the nanocrystalline aluminum material that table 1 embodiment 1 makes

[0038]

Embodiment 2

[0040] Same as Example 1, the only difference is that the number of extrusion passes is 7, and the extrusion pressure is 70T and 90T, to obtain nanocrystalline aluminum material.

[0041] The grain size of the nanocrystalline aluminum material prepared in Example 2 was tested, and the results are shown in Table 2. It can be seen from Table 2 that the grain size of the prepared nanocrystalline aluminum material is 90-150 nm.

[0042] The grain size of the nanocrystalline aluminum material that table 2 embodiment 2 makes

[0043]

[0044]

[0045] The nanocrystalline aluminum material prepared in Examples 1-2 is used for the negative electrode of the aluminum-air fuel cell, the positive electrode of the aluminum-air fuel cell is oxygen, and 4M sodium hydroxide aqueous solution is used as the electrolyte. The hydrogen evolution corrosion rate of different nanocrystalline aluminum materials in 4M sodium hydroxide aqueous solution was detected, and the results are shown in Ta...

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Abstract

The invention provides a preparation method of a nanocrystalline aluminum material, and belongs to the field of metal air fuel cells. The method comprises the following step: performing equal-channel angular pressing on a pure aluminum or aluminum alloy sample to obtain a nanocrystalline aluminum material. Psi of equal-channel angular extrusion is 30-70 DEG, phi is 90 DEG, the number of extrusion passes is 5-10, and the extrusion pressure is 50-90 T; and the diameter of the pure aluminum or aluminum alloy sample is 10-100 mm. An equal-channel extrusion technology is adopted, the microstructure of a pure aluminum or aluminum alloy sample is changed into a nanocrystalline structure, the grain size is reduced, and the fine and uniform grain structure integrally improves the uniformity of the microstructure and reduces galvanic corrosion between grains, so that the hydrogen evolution rate is reduced, the discharge efficiency is improved, and the mass energy density of the nanocrystalline aluminum material as the negative electrode material is greatly improved.

Description

[0001] This application is a divisional application with an application date of February 24, 2018, an application number of 201810157491.9, and an invention title of "A Nanocrystalline Aluminum Material, Its Preparation Method and Application, and Aluminum Air Fuel Cell". technical field [0002] The invention relates to the technical field of air fuel cells, in particular to a nanocrystalline aluminum material, a preparation method and application thereof, and an aluminum-air fuel cell. Background technique [0003] The aluminum-air fuel cell is composed of catalytic air positive electrode, electrolyte and metal aluminum alloy negative electrode. The theoretical specific energy of the aluminum negative electrode is 8100Wh / kg. At present, the actual specific energy of the aluminum-air fuel cell is as high as 650Wh / kg, which is much higher than other types. Battery. Since aluminum is the most abundant metal element on the earth, its price is low, especially its chemical activ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/38H01M4/46H01M12/06H01M12/08B21C23/00B82Y30/00B82Y40/00
CPCH01M4/38H01M12/06H01M12/08B82Y30/00B21C23/002H01M4/463B82Y40/00Y02E60/10
Inventor 卢惠民曹媛许彬彬
Owner BEIHANG UNIV
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