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

A nanocrystalline aluminum, fuel cell technology, applied in fuel cell type half cells and primary cell type half cells, battery electrodes, circuits, etc., can solve the problem of hindering the commercial application of aluminum air fuel cells and increasing the internal electrical loss of the battery , excessive consumption of negative electrode materials, etc., to reduce the rate of hydrogen evolution, increase energy density, and improve uniformity.

Active Publication Date: 2020-08-04
BEIHANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] 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 an aluminum-air fuel cell
  • Nanocrystalline aluminum material, preparation method and application thereof, and an aluminum-air fuel cell
  • Nanocrystalline aluminum material, preparation method and application thereof, and an aluminum-air fuel cell

Examples

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preparation example Construction

[0022] The invention provides a method for preparing a nanocrystalline aluminum material, comprising the following steps:

[0023] High-pressure twisting of pure aluminum or aluminum alloy raw materials to obtain nanocrystalline aluminum materials;

[0024] The conditions for the high-pressure torsion include: the number of revolutions is 3 to 11 revolutions, the pressure is 4 to 6 GPa, and the twisting speed is 1 to 2 revolutions per minute;

[0025] The diameter of the pure aluminum or aluminum alloy raw material is 10-20 mm.

[0026] In the present invention, the rotation number of the high-pressure torsion is preferably 7 rotations, the pressure is preferably 4GPa, and the diameter of the pure aluminum or aluminum alloy sample is preferably 20mm.

[0027] The present invention has no special limitation on the specific method of high-pressure twisting, and the high-pressure twisting method well known to those skilled in the art can be adopted; Just twist the device. The ...

Embodiment 1

[0036] High-pressure torsion is performed on high-purity aluminum samples (20mm in diameter), and the conditions for high-pressure torsion include: the number of revolutions is 3 to 11 revolutions, the pressure is 4GPa, and the torsion speed is 1 revolution per minute to obtain nanocrystalline aluminum materials.

[0037] 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 50-150 nm.

[0038] The grain size of the nanocrystalline aluminum material that table 1 embodiment 1 makes

[0039]

Embodiment 2

[0041] Same as Example 1, the only difference is that the number of revolutions is 7 revolutions, the extrusion pressure is 5GPa and 6GPa, and the nanocrystalline aluminum material is obtained.

[0042] The grain size of the nanocrystalline aluminum material prepared in Example 2 was detected, 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 as low as 48nm.

[0043] The grain size of the nanocrystalline aluminum material that table 2 embodiment 2 makes

[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 s...

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Abstract

The invention provides a preparation method of a nanocrystalline aluminum material, which belongs to the field of air fuel batteries. The nanocrystalline aluminum material is obtained by twisting purealuminum or an aluminum-alloy raw material at a high pressure; and the high-pressure twisting condition comprises: the number of revolutions is 3 to 11, the pressure is 4 to 6 GPa, and the twisting rate is 1 to 2 turns per minute; and a diameter of the pure aluminum or aluminum-alloy raw material is 10 to 20 mm. By adopting the high-pressure twisting technology, a micro structure of the pure aluminum or aluminum-alloy sample is changed to be a nanocrystalline structure, so that the size of the crystal particle is reduced, the tiny and uniform crystal particle tissue can generally improve theuniformity of the micro tissues, the galvanic corrosion among the crystal particles can be reduced, the hydrogen precipitation rate is reduced, the discharging efficiency is improved, and the mass energy density of the nanocrystalline aluminum material as a negative material can be greatly improved.

Description

technical field [0001] 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 [0002] 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 activity is lower than that of lithium, it is easy to control and has a large theoretical specific energy; it is easy to operate, has a long service life, and the metal aluminum electrode can be replaced mechanically. The management is simple, and the battery life only depends o...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/38H01M4/46H01M12/06
CPCH01M4/38H01M4/463H01M12/06Y02E60/10
Inventor 卢惠民曹媛许彬彬杨文文
Owner BEIHANG UNIV
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