Rare earth-aluminum intermediate alloy ingot suitable for lithium ion battery and preparation method thereof

An intermediate alloy ingot and lithium-ion battery technology, 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 strength can only reach pure aluminum. Strength and mechanical properties, high cup convexity, and good electrical conductivity

Active Publication Date: 2016-08-10
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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  • Rare earth-aluminum intermediate alloy ingot suitable for lithium ion battery and preparation method thereof
  • Rare earth-aluminum intermediate alloy ingot suitable for lithium ion battery and preparation method thereof

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preparation example Construction

[0041] see figure 1 , the invention provides a method for preparing a rare earth aluminum master alloy ingot suitable for lithium ion batteries, comprising:

[0042] S101. Add rare earth elements into ionic liquid A for dispersion, the weight ratio of the rare earth elements to ionic liquid A is 1:1, the reaction temperature is 90-110°C, and carbon dioxide or ammonia gas is introduced to obtain precipitates and ions liquid B;

[0043] Wherein, the rare earth element is selected from any one of lanthanum, cerium, praseodymium, neodymium, promethium, samarium, europium, gadolinium, terbium, dysprosium, holmium, erbium, thulium, ytterbium, and lutetium;

[0044] The purity of the rare earth elements is ≥99%.

[0045]The ionic liquid A is selected from 1-ethyl-3-methylimidazolium tricyanomethyl salt, 1-butyl-3-methylimidazolium tetrafluoroborate, 1-butyl-3-methylimidazolium hexafluorophosphoric acid salt, 1-butyl-3-methylimidazolium trifluoromethanesulfonate, 1-butyl-3-methylim...

Embodiment 1

[0089] 1. The carbonate of praseodymium is added into 1-ethyl-3-methylimidazolium tricyanomethyl salt to disperse, the reaction temperature is 90°C, and carbon dioxide is introduced to obtain precipitate and ionic liquid B, and the generated gas is Imported into soda lime absorption tank, absorbed by soda lime to make fertilizer;

[0090] 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;

[0091] 3. Distilling the nanomaterials under reduced pressure and extracting them to obtain nanoparticles;

[0092] 4. Clean the nanoparticles with deionized water, and heat and dry them at a temperature of 100°C;

[0093] 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 aluminum powder is aluminum powder made of 1060 aluminum alloy with a purity of ≥99.99%;

[0094] 6. Stir the powder cake in an...

Embodiment 2

[0097] 1. Add ammonium salt of neodymium into 1-butyl-3-methylimidazolium hexafluorophosphate for dispersion, the reaction temperature is 95°C, and ammonia gas is introduced to obtain precipitate and ionic liquid B, and the generated gas is Imported into soda lime absorption tank, absorbed by soda lime to make fertilizer;

[0098] 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;

[0099] 3. Distilling the nanomaterials under reduced pressure and extracting them to obtain nanoparticles.

[0100] 4. Wash the nanoparticles with deionized water, and heat and dry them at a temperature of 110°C

[0101] 5. Grind the dried nanoparticles and aluminum powder, mix and stir, and press into a powder cake according to a weight ratio of 1:1000. The aluminum powder is aluminum powder made of 1080 aluminum alloy with a purity of ≥99.99%;

[0102]6. Stir the powder cake in an electrom...

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Abstract

The invention discloses a preparation method of a rare earth-aluminum intermediate alloy ingot suitable for a lithium ion battery. The preparation method of the rare earth-aluminum intermediate alloy ingot suitable for the lithium ion battery comprises the steps that (1) rare earth elements are added into ionic liquid A to be dispersed, and carbon dioxide or ammonia gas is introduced into the ionic liquid A, so that sediment and ionic liquid B are obtained; (2) the sediment and the ionic liquid B are placed into a grinding machine to be ground, so that nano materials with the particle sizes of 1-200 nm are obtained; (3) reduced pressure distillation is conducted on the nano materials, so that nano particles are obtained through extraction; (4) the nano particles are cleaned and heated to be dried; (5) the dried nano particles and aluminum powder are ground, mixed, stirred and crushed into pressed powder; (6) the pressed powder is stirred in an electromagnetic stirring furnace so as to be molten into aluminum-based intermediate alloy; and (7) the aluminum-based intermediate alloy is cast into the rare earth-aluminum intermediate alloy ingot. Correspondingly, the invention further discloses the rare earth-aluminum intermediate alloy ingot prepared through the method. The rare earth-aluminum intermediate alloy ingot is high in strength, heat conductivity and electric conductivity, good in mechanical property and resistant to electrochemical corrosion.

Description

technical field [0001] The invention relates to the technical field of metal aluminum, in particular to a rare earth aluminum master alloy ingot 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 require...

Claims

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Application Information

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IPC IPC(8): C22C21/00C22C1/02B22F9/16B22F9/04
CPCB22F9/04B22F9/16B22F2009/045B22F2009/165C22C1/026C22C21/00
Inventor 周伟杰刘锴
Owner 佛山金兰铝厂有限公司
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