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Aluminum foil and preparation method thereof

A technology of aluminum foil and aluminum liquid, applied in metal rolling, electrochemical generators, electrical components, etc., can solve the problems of reducing the ductility of aluminum foil, unfavorable aluminum foil rolling and processing, etc., to prevent broken strips, high tensile strength, good ductility

Active Publication Date: 2020-09-18
EVE HYPERPOWER BATTERIES INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The scheme disclosed in the above-mentioned patent is mainly to prevent the aluminum foil of the lithium-ion battery from being broken during the cold pressing process by increasing the tensile strength of the aluminum foil, but it reduces the ductility of the aluminum foil to a certain extent, which is not conducive to the development of the aluminum foil. Rolling

Method used

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  • Aluminum foil and preparation method thereof
  • Aluminum foil and preparation method thereof
  • Aluminum foil and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach

[0027] In one embodiment, an aluminum foil contains the following elements by weight percentage: 0.08%-0.9% of silicon, 0.28%-1.8% of iron, 0.001%-0.005% of gold, and 0.001%-0.006% of platinum. The aluminum foil also contains unavoidable impurities.

[0028] It should be noted that, on the one hand, by adding a certain amount of silicon and iron to aluminum, it is helpful for the formation of dendrite spacing in aluminum foil, the particles of the intermediate metal compound in aluminum foil are small, the composition segregation is large, and the degree of supersaturation of solute elements in the solid solution is greatly increased. Improve, improve work hardening of aluminum materials, large deformation resistance, improve tensile strength.

[0029] On the one hand, gold is the most malleable metal, and a gram of gold can be punched into a square meter sheet, or an ounce of gold can be punched into 300 square feet. Gold leaf can even be thinned to translucency. Therefore,...

Embodiment 1

[0064] S111, under the protection of an inert atmosphere, heat the aluminum ingot at a temperature of 1800° C. to melt the aluminum ingot to obtain molten aluminum; pass the molten aluminum through a high-temperature-resistant silicon-based filter with a pore size of 0.1 μm net to filter.

[0065] S121, adding 0.08% silicon powder, 0.28% iron powder, 0.001% gold powder and 0.001% platinum powder to the aluminum liquid, and performing mixing and melting to obtain the aluminum alloy liquid; standing and defoaming the aluminum alloy liquid .

[0066] S131, cooling the aluminum alloy liquid, the cooling temperature is 500° C.; then rolling the first aluminum alloy coil with a rolling machine to obtain the first aluminum alloy coil; performing the first aluminum alloy coil on the first aluminum alloy coil Rolling twice to obtain a second aluminum alloy coil; performing two annealing on the second aluminum alloy coil, wherein the temperature of the first annealing is 435° C., and t...

Embodiment 2

[0068] S112, under the protection of an inert atmosphere, heat the aluminum ingot, the heating temperature is 2000°C, so as to melt the aluminum ingot to obtain molten aluminum; pass the molten aluminum through a high-temperature-resistant silicon-based filter with a pore size of 0.3 μm net to filter.

[0069] S122, adding 0.9% silicon powder, 1.8% iron powder, 0.005% gold powder and 0.006% platinum powder to the aluminum liquid, and performing mixing and melting to obtain the aluminum alloy liquid; standing and defoaming the aluminum alloy liquid .

[0070] S132, cooling the aluminum alloy liquid, the cooling temperature is 700°C; and then rolling the first aluminum alloy coil with a rolling machine to obtain the first aluminum alloy coil; performing the first aluminum alloy coil on the first aluminum alloy coil Rolling twice to obtain a second aluminum alloy coil; performing two annealing on the second aluminum alloy coil, wherein the temperature of the first annealing is 4...

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Abstract

The invention relates to the technical field of metal processing, and discloses an aluminum foil and a preparation method thereof. The aluminum foil is prepared from the doping elements in the percentages by weight: 0.08%-0.9% of silicon, 0.28%-1.8% of iron, 0.001%-0.005% of gold, 0.001%-0.006% of platinum. The preparation method of the aluminum foil includes the following steps that silicon, iron, gold and platinum are added into aluminum, mixing smelting is carried out to obtain aluminum alloy liquid, and the aluminum alloy liquid is rolled to obtain the aluminum foil. The mass ratios of silicon, iron, gold and platinum are scientifically mixed, under the synergistic effect of the four elements, the structure of the aluminum foil is changed, through mixing melting and rolling, the aluminum foil with high tensile strength and good ductility can be obtained, the rolling process of the aluminum foil is facilitated, and the aluminum foil of a lithium-ion battery can be prevented from being broken during cold pressing.

Description

technical field [0001] The invention relates to the technical field of metal processing, in particular to an aluminum foil and a preparation method thereof. Background technique [0002] The aluminum foil of the lithium-ion battery will be broken during the cold pressing process. In order to prevent this phenomenon, on the one hand, the strength of the aluminum foil is improved, and on the other hand, the ductility of the aluminum foil is improved. Some literature shows that the composition of aluminum foil has a great influence on its structure and strength. The solid solution of Fe and Si in aluminum can increase the hardness of the material and also increase the work hardening of the material, especially Si, and its deformation resistance also increases. , but it is not conducive to rolling into ultra-thin aluminum foil. Studies have shown that adding Cu to aluminum foil can increase the strength of the foil, and by adding second phase points such as Mn, Fe, and Mg, thes...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C21/00B21B1/40C22C1/02C22F1/04H01M10/0525
CPCC22C21/00C22C1/026B21B1/40C22F1/04H01M10/0525Y02E60/10
Inventor 赵明娟崔云王理祝媛刘建华
Owner EVE HYPERPOWER BATTERIES INC
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