Aluminum foil and its preparation method

A technology of aluminum foil and molten aluminum, applied in metal rolling, electrochemical generators, electrical components, etc., can solve the problems of reducing the ductility of aluminum foil, unfavorable rolling process of aluminum foil, etc., to prevent belt breakage, high tensile strength, Good ductility

Active Publication Date: 2022-04-12
EVE ENERGY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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 its preparation method
  • Aluminum foil and its preparation method
  • Aluminum foil and its preparation method

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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 contains the following doping elements in weight percentages: 0.08% to 0.9% of silicon, 0.28% to 1.8% of iron, 0.001% to 0.005% of gold, Platinum 0.001% to 0.006%. The preparation method of the aluminum foil comprises the following steps: adding silicon, iron, gold and platinum to aluminum, performing mixing and smelting to obtain aluminum alloy liquid; rolling the aluminum alloy liquid to obtain aluminum foil. The invention scientifically mixes the mass proportions of silicon, iron, gold and platinum. Under the mutual synergistic effect of these four elements, the structure of the aluminum foil is changed, and after mixing, smelting and rolling, high tensile strength and good ductility can be obtained. Aluminum foil is beneficial to the rolling process of aluminum foil, and can prevent the aluminum foil of lithium-ion batteries from breaking during the cold pressing process.

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 Patents(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 ENERGY CO LTD
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