Aluminum foil suitable for lithium ion battery and preparation method thereof

A lithium-ion battery and aluminum foil technology, applied in the field of metal aluminum, can solve the problems of the unsatisfactory tensile strength and electrical conductivity of aluminum materials, the high cost of aluminum materials, and the strength can only reach pure aluminum. Mechanical performance index, high cupping value, good electrical conductivity

Active Publication Date: 2016-09-21
佛山金兰铝厂有限公司
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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

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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 invention provides a kind of preparation method that is applicable to the aluminum foil of lithium ion battery, comprises:

[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 a purity of ≥99% and a copper content The aluminum powder with 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 master alloy ingot;

[0050] S2, adding the rare earth aluminum master alloy ingot and the aluminum ingot with a purity ≥ 99% in the smelting furnace in a weight ratio of 1:8-12, and smelting to obtain a billet;

[0051] Smelting is to remove gas and slag, reduce the hydrogen in the rare earth aluminum foil, and rem...

Embodiment 1

[0108] 1. Preparation of rare earth aluminum master alloy ingots:

[0109] 1. Add praseodymium carbonate to 1-ethyl-3-methylimidazolium tricyanomate for dispersion, the weight ratio of praseodymium and 1-ethyl-3-methylimidazolium tricyanomate is 1:1 , the reaction temperature is 90°C, and carbon dioxide is introduced to obtain precipitate and ionic liquid B, and the generated gas is introduced into the soda lime absorption tank, and is absorbed by soda lime to make fertilizer;

[0110] 2. Put the precipitate and ionic liquid B into a diamond grinder for grinding, and grind for 1 hour to obtain nanomaterials with a particle size of 1-200nm;

[0111] 3. Distill the nanomaterials under reduced pressure to obtain nanoparticles;

[0112] 4. Wash the nanoparticles with deionized water, and heat and dry them at a temperature of 100°C;

[0113] 5. Grind the dried nanoparticles and aluminum powder, mix and stir, and press into a powder cake according to a weight ratio of 1:900. The a...

Embodiment 2

[0122] 1. Preparation of rare earth aluminum master alloy ingots:

[0123] 1. Add the ammonium salt of neodymium into 1-butyl-3-methylimidazolium hexafluorophosphate for dispersion, the weight ratio of neodymium and 1-butyl-3-methylimidazolium hexafluorophosphate is 1:1, The reaction temperature is 95°C, and ammonia gas is introduced to obtain precipitates and ionic liquid B. The generated gas is introduced into the soda lime absorption tank and absorbed by soda lime to make fertilizer;

[0124] 2. Put the precipitate and ionic liquid B into a diamond grinder for grinding, and grind for 2 hours to obtain nanomaterials with a particle size of 1-200nm;

[0125] 3. Distilling the nanomaterials under reduced pressure and extracting them to obtain nanoparticles.

[0126] 4. Wash the nanoparticles with deionized water, and heat and dry them at a temperature of 110°C

[0127] 5. Grind the dried nanoparticles and aluminum powder, mix and stir, and press into a powder cake according ...

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Abstract

The invention discloses a preparation method of aluminum foil suitable for a lithium ion battery. The method includes the steps that firstly, rare earth elements are ground to obtain a nano rare earth material with the grain size being 1-200 nm, the nano rare earth material and aluminum powder are ground, mixed and stirred and then pressed into a powder cake, and then the powder cake is melted and cast into a rare earth aluminum intermediate alloy ingot; secondly, the rare earth aluminum intermediate alloy ingot and an aluminum ingot are added into a smelting furnace to be smelted, and a blank is obtained; thirdly, the blank is cast into a large slab ingot, finish face milling is conducted, and aluminum crystal refining is achieved through an annealing process; fourthly, the large slab ingot is hot-rolled, annealed for the first time, roughly rolled and annealed for the second time; fifthly, the large slab ingot is cold-rolled, annealed for the first time, roughly rolled and annealed for the second time, and a primary product is obtained; and sixthly, the primary product is finely rolled to obtain the aluminum foil. Correspondingly, the invention discloses the aluminum foil prepared through the method. The aluminum foil is high in strength, heat conductivity and electric conductivity, good 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 for aluminum foil for lithium-ion batteries are higher than those for 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 positive electrode material has the largest contact area with aluminum foil. Aluminum foil is required to maintain good tensile strength and other mechanical properties after thermal cycling. [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 resistant to the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22F1/04C22C1/03H01M4/66
CPCC22C1/026C22C1/03C22F1/04H01M4/662Y02E60/10
Inventor 周伟杰刘锴
Owner 佛山金兰铝厂有限公司
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