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Aluminum foil suitable for lithium ion battery and preparation method thereof

A lithium-ion battery and aluminum foil technology, which is applied in the field of metal aluminum, can solve the problems that the tensile strength and conductivity of aluminum materials cannot be satisfied, the cost of aluminum materials remains high, and the conductivity of aluminum alloys is affected, so as to increase the strength and mechanical properties of the aluminum alloy. Performance indicators, high cupping value, and good elongation

Active Publication Date: 2018-01-05
佛山金兰铝厂有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] At present, in the research and application of the conductivity of aluminum conductors, rare earth aluminum materials and boron-containing aluminum materials are more successful, but although the former improves the strength of aluminum alloys, it affects the conductivity of aluminum alloys; Improve the conductivity of aluminum alloy to a certain extent, but the strength can only reach the level of pure aluminum
[0008] Prior art, publication number is the patent of CN1300356 C, and it discloses a kind of aluminum base material that contains rare earth, boron with high conductivity, and the material composition disclosed in its embodiment all contains aluminum Al, rhenium Re and boron B, but rhenium all over the world The output of Re is only 48.8 tons, and the output of rhenium in my country is only 2 tons. The price is high, resulting in high cost of aluminum materials, making it difficult to market and apply to the production of large-volume lithium batteries.
Moreover, the tensile strength and electrical conductivity of the aluminum material of this patent cannot meet the requirements of aluminum foil for lithium-ion batteries

Method used

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  • Aluminum foil suitable for lithium ion battery and preparation method thereof
  • Aluminum foil suitable for lithium ion battery and preparation method thereof
  • Aluminum foil suitable for lithium ion battery and preparation method thereof

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preparation example Construction

[0048] See figure 1 , The present invention provides a method for preparing aluminum foil suitable for lithium ion batteries, including:

[0049] S1. Preparation of rare earth aluminum master alloy ingots: Put rare earth elements with a purity of ≥99% into a diamond grinder for grinding to obtain nano-rare earth materials with a particle size of 1-200nm, and combine the nano-rare earth materials with purity ≥99% and copper content The aluminum powder less than 0.005% is ground, mixed and stirred, and pressed into a powder cake according to the weight ratio of 1:900-1200, and then the powder cake is melted and cast into a rare earth aluminum intermediate alloy ingot;

[0050] S2. Add rare earth aluminum master alloy ingots and aluminum ingots with a purity of ≥99% into a smelting furnace at a weight ratio of 1:8-12 to perform smelting to obtain billets;

[0051] Preferably, the melting conditions are: 6 hours in a 700°C melting furnace.

[0052] Smelting is to remove gas and slag, redu...

Embodiment 1

[0115] 1. Preparation of rare earth aluminum master alloy ingots:

[0116] 1. Add the carbonate of praseodymium to 1-ethyl-3-methylimidazole cyanomethyl salt for dispersion, and the weight ratio of praseodymium to 1-ethyl-3-methylimidazole cyanomethyl salt is 1:1 , The reaction temperature is 90℃, and carbon dioxide is introduced to obtain the precipitate and ionic liquid B. The generated gas is introduced into the soda lime absorption tank and absorbed by the soda lime to make fertilizer;

[0117] 2. Put the precipitate and ionic liquid B into a diamond grinder for grinding, and grinding for 1 hour to obtain nanomaterials with a particle size of 1-200nm;

[0118] 3. The nanomaterials are distilled under reduced pressure and extracted to obtain nanoparticles;

[0119] 4. Wash the nanoparticles with deionized water and heat and dry them at a temperature of 100°C;

[0120] 5. Grind the dried nanoparticles and aluminum powder, mix and stir, and press them into a powder cake according to a...

Embodiment 2

[0129] 1. Preparation of rare earth aluminum master alloy ingots:

[0130] 1. Add the ammonium salt of neodymium to 1-butyl-3-methylimidazole hexafluorophosphate for dispersion. The weight ratio of neodymium to 1-butyl-3-methylimidazole hexafluorophosphate is 1:1. The reaction temperature is 95°C, and ammonia gas is introduced to obtain precipitate and ionic liquid B. The generated gas is introduced into the soda lime absorption tank and absorbed by the soda lime to make fertilizer;

[0131] 2. Put the precipitate and ionic liquid B into a diamond grinder for grinding, and grinding for 2 hours to obtain nanomaterials with a particle size of 1-200nm;

[0132] 3. The nanomaterial is distilled under reduced pressure, and the nanoparticle is obtained by extraction.

[0133] 4. Wash the nanoparticles with deionized water and heat and dry them at a temperature of 110°C

[0134] 5. Grind the dried nanoparticles and aluminum powder, mix and stir, and press into a powder cake according to the w...

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Abstract

The invention discloses a preparation method of an aluminum foil suitable for a lithium ion battery. The preparation method comprises the following steps: (1) rare earth elements are grinded to obtain a nanometer rare earth material with a particle size of 1-200 nm; the nanometer rare earth material is grinded and mixed with aluminum powder to press as a powder cake; and the powder cake is melted and cast as a rare earth aluminum intermediate alloy ingot; (2) the rare earth aluminum intermediate alloy ingot and an aluminum ingot are added in a smelting furnace for smelting to obtain a blank; (3) the smelted blank is rolled to obtain an aluminum plate blank; (4) the aluminum plate blank is continuously cast and rolled; (5) the aluminum plate blank is continuously coldly rolled to obtain a primary product; and (6) the primary product is finely rolled to obtain the aluminum foil. Corresponding, the invention further discloses the aluminum foil prepared by the method. The aluminum foil is high in strength, high in heat conductivity, high in electric conductivity, excellent in mechanical performance and resistant to electrochemical corrosion.

Description

Technical field [0001] The invention relates to the technical field of metal aluminum, in particular to an aluminum foil suitable for lithium ion batteries and a preparation method thereof. Background technique [0002] The requirements of aluminum foil for lithium ion batteries are higher than that of ordinary aluminum foil: [0003] First, the working environment of aluminum foil for lithium-ion batteries is relatively harsh. During the charging and discharging process of lithium-ion batteries, the positive electrode material is prone to heat, and the aluminum foil has the largest contact area of ​​the positive electrode material. After the aluminum foil is thermally cycled, it is required to still maintain good tensile strength and other mechanical properties. [0004] Second, the working environment of aluminum foil for lithium batteries is inside the battery, which has the corrosion effect of lithium hexafluorophosphate electrolyte, so the aluminum foil is required to be resist...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B21B1/40B21B1/46C22C1/03C22C21/00
CPCB21B1/40B21B1/46C22C1/026C22C1/03
Inventor 周伟杰刘锴
Owner 佛山金兰铝厂有限公司
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