CN113564425A - Aluminum foil for 1N00 lithium battery and preparation method thereof - Google Patents
Aluminum foil for 1N00 lithium battery and preparation method thereof Download PDFInfo
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- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 title claims abstract description 80
- 229910052782 aluminium Inorganic materials 0.000 title claims abstract description 78
- 239000011888 foil Substances 0.000 title claims abstract description 67
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 title claims abstract description 61
- 229910052744 lithium Inorganic materials 0.000 title claims abstract description 61
- 238000002360 preparation method Methods 0.000 title abstract description 14
- 238000005096 rolling process Methods 0.000 claims abstract description 50
- 238000000034 method Methods 0.000 claims abstract description 30
- 238000000137 annealing Methods 0.000 claims abstract description 27
- 238000005266 casting Methods 0.000 claims abstract description 20
- 238000003723 Smelting Methods 0.000 claims abstract description 16
- 238000005097 cold rolling Methods 0.000 claims abstract description 13
- 229910052802 copper Inorganic materials 0.000 claims abstract description 13
- 229910052742 iron Inorganic materials 0.000 claims abstract description 13
- 229910052748 manganese Inorganic materials 0.000 claims abstract description 13
- 238000000265 homogenisation Methods 0.000 claims abstract description 8
- 229910052710 silicon Inorganic materials 0.000 claims abstract description 5
- 229910045601 alloy Inorganic materials 0.000 claims description 14
- 239000000956 alloy Substances 0.000 claims description 14
- 238000007670 refining Methods 0.000 claims description 12
- 229910052719 titanium Inorganic materials 0.000 claims description 9
- 229910052725 zinc Inorganic materials 0.000 claims description 9
- 238000010008 shearing Methods 0.000 claims description 8
- 239000003795 chemical substances by application Substances 0.000 claims description 7
- 239000000203 mixture Substances 0.000 claims description 5
- 239000002699 waste material Substances 0.000 claims description 5
- 238000010438 heat treatment Methods 0.000 claims description 4
- 239000002994 raw material Substances 0.000 claims description 4
- 238000003756 stirring Methods 0.000 claims description 4
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 claims description 3
- 125000001309 chloro group Chemical group Cl* 0.000 claims description 3
- 239000001257 hydrogen Substances 0.000 claims description 3
- 229910052739 hydrogen Inorganic materials 0.000 claims description 3
- 239000000155 melt Substances 0.000 claims description 3
- 238000002844 melting Methods 0.000 claims description 2
- 230000008018 melting Effects 0.000 claims description 2
- 238000004519 manufacturing process Methods 0.000 abstract description 12
- 230000000052 comparative effect Effects 0.000 description 15
- 230000008569 process Effects 0.000 description 11
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 10
- 239000011149 active material Substances 0.000 description 4
- 238000011056 performance test Methods 0.000 description 4
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 3
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 3
- 239000013078 crystal Substances 0.000 description 3
- 229910001416 lithium ion Inorganic materials 0.000 description 3
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000003490 calendering Methods 0.000 description 2
- 229910052799 carbon Inorganic materials 0.000 description 2
- 239000011248 coating agent Substances 0.000 description 2
- 238000000576 coating method Methods 0.000 description 2
- 238000005520 cutting process Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000003825 pressing Methods 0.000 description 2
- 239000013543 active substance Substances 0.000 description 1
- 229910000905 alloy phase Inorganic materials 0.000 description 1
- 229910052786 argon Inorganic materials 0.000 description 1
- 230000003749 cleanliness Effects 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000007872 degassing Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 230000006870 function Effects 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 229910002804 graphite Inorganic materials 0.000 description 1
- 239000010439 graphite Substances 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000003446 memory effect Effects 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 239000002893 slag Substances 0.000 description 1
- 239000006104 solid solution Substances 0.000 description 1
- 238000007711 solidification Methods 0.000 description 1
- 230000008023 solidification Effects 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 238000005482 strain hardening Methods 0.000 description 1
- 230000003746 surface roughness Effects 0.000 description 1
- 238000012795 verification Methods 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C21/00—Alloys based on aluminium
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
- B21B1/40—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling foils which present special problems, e.g. because of thinness
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/26—Methods of annealing
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0221—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the working steps
- C21D8/0236—Cold rolling
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0247—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the heat treatment
- C21D8/0268—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the heat treatment between cold rolling steps
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C1/00—Making non-ferrous alloys
- C22C1/02—Making non-ferrous alloys by melting
- C22C1/026—Alloys based on aluminium
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22F—CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS
- C22F1/00—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
- C22F1/04—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of aluminium or alloys based thereon
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/052—Li-accumulators
- H01M10/0525—Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/64—Carriers or collectors
- H01M4/66—Selection of materials
- H01M4/661—Metal or alloys, e.g. alloy coatings
- H01M4/662—Alloys
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/64—Carriers or collectors
- H01M4/70—Carriers or collectors characterised by shape or form
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
Abstract
The invention belongs to the technical field of aluminum foil rolling manufacturing, discloses an aluminum foil for a 1N00 lithium battery and a preparation method thereof, and aims to solve the technical problems that in the prior art, the aluminum foil for the lithium battery is broken due to insufficient strength and ductility in the manufacturing process of the battery, and the production efficiency of the aluminum foil for the lithium battery is improved. The aluminum foil comprises the following components in percentage by mass: al, Si: 0.01-0.2%, Fe: 0.45-0.9%, Cu: 0.01 to 0.2%, Mn: less than or equal to 0.02 percent, Zn: less than or equal to 0.04 percent, Ti: less than or equal to 0.04 percent. The method comprises the following steps: smelting, casting rolling, cold rolling and foil rolling, wherein in the cold rolling stage, after the cast and rolled finished coil is roughly rolled to a preset thickness, intermediate homogenization annealing treatment is carried out. The tensile strength of the aluminum foil prepared by the method is larger than or equal to 270MPa, the elongation is larger than or equal to 4.0%, and the use performance of the aluminum foil for the power lithium battery is greatly improved.
Description
Technical Field
The invention relates to an aluminum foil for a 1N00 lithium battery and a preparation method thereof, belonging to the technical field of aluminum foil calendaring and manufacturing.
Background
In recent years, the power lithium ion battery industry has received high attention and great support from governments around the world. Compared with the traditional battery, the power lithium ion battery has the advantages of high energy density, high working voltage, light weight, small volume, small self-discharge, no memory effect, long cycle life, quick charge and the like, and is called as a green new energy product. With the development of new energy vehicles and the improvement of energy-saving and environment-friendly requirements, the market space of power lithium ion batteries is further expanded.
In 2016, the yield of the Chinese automobile power lithium battery is 30.8GWH, and is increased by 82.2% on a par. With the promotion of lithium battery production technology, cost reduction, increase of the popularity of new energy automobiles and supporting facilities and the like in the future, the demand of lithium batteries of new energy automobiles keeps continuously increasing in the future 3 years, and the GGII predicts that the output of Chinese automobile power lithium batteries reaches 215GWH in 2022 years, which is nearly 6 times higher than that in 2016.
Aluminum foil for lithium batteries is used as a current collector of lithium batteries, and during a flattening process such as roll rolling of an electrode coated with an active material such as graphite, the aluminum foil for lithium batteries needs to be deformed enough to adapt to the surface characteristics of the active material, so that the contact performance between the aluminum foil for lithium batteries and the active material is poor, and if the tensile strength is low, the electrode coated with the active material is prone to fracture during the flattening process such as roll rolling. And meanwhile, the elongation rate is enough, and if the elongation rate is low, when the electrode coated with the active substance is subjected to flattening procedures such as roll calendering and the like, the aluminum foil for the power functional material generates internal stress and is split, so that the performances such as battery capacity, cycle life and the like are directly influenced. The common pure aluminum foil for lithium batteries has an alloy mark H18 state of 1060, 1050, 8011 and the like. At present, the quality problems of soft strength, low elongation, insufficient compactness, uneven surface roughness, insufficient surface quality cleanliness and the like exist in the field.
Disclosure of Invention
Aiming at the defects of the prior art, the invention aims to provide an aluminum foil for a 1N00 lithium battery and a preparation method thereof, so as to solve the technical problems that the aluminum foil for the lithium battery in the prior art cannot have good extensibility and high tensile strength, is not beneficial to reducing the production cost of the aluminum foil for the lithium battery and improving the production efficiency of the aluminum foil.
In order to solve the technical problems, the technical scheme adopted by the invention is as follows:
an aluminum foil for a 1N00 lithium battery comprises the components of Al, Si, Fe, Cu, Mn, Zn and Ti; the mass percentages of Si, Fe, Cu, Mn, Zn and Ti are as follows: si: 0.01-0.2%, Fe: 0.45-0.9%, Cu: 0.01 to 0.2%, Mn: less than or equal to 0.02 percent, Zn: less than or equal to 0.04 percent, Ti: less than or equal to 0.04 percent.
The invention also provides a preparation method of the aluminum foil for the 1N00 lithium battery, and the method performs component control according to the aluminum foil for the 1N00 lithium battery, and comprises the following steps: smelting, casting rolling, cold rolling and foil rolling, wherein in the cold rolling stage, after the cast and rolled finished coil is roughly rolled to the thickness of 4.5-5.5mm, intermediate homogenization annealing treatment is carried out.
Preferably, the intermediate homogenizing annealing treatment specifically comprises: homogenizing and annealing at 515-540 deg.C for 27-33 h.
Preferably, the cold rolling stage, after the intermediate homogenizing annealing treatment, further comprises:
rolling to a longitudinal shearing edge of 0.9-1.5 mm, rolling to a longitudinal shearing edge of 0.2-0.3mm, and finish rolling to the thickness of a finished product.
Preferably, before the cold rolling stage, a smelting stage and a casting and rolling stage are also included;
the smelting stage comprises: heating and leveling the raw materials, and uniformly stirring, wherein the proportion of waste materials is less than or equal to 30 percent (aluminum plate coils with the same alloy components), and the balance is aluminum ingots, the smelting temperature is 730-740 ℃, and the converter-reversing temperature is 740-760 ℃.
Preferably, in the casting stage: the temperature of the front box is 694-704 ℃, the casting and rolling speed is 850-1100 mm/min, the casting and rolling area is 55-75 mm, and the temperature of the roll surface is less than or equal to 80 ℃.
Preferably, during smelting, the special refining agent is used for refining at the temperature of 730 ℃ for 20min, then refining at the temperature of 740 ℃ for 20min, and turning over the furnace after the components are adjusted, wherein the turning-over temperature is 750 ℃; the special refining agent is chlorine salt.
Preferably, the thickness of the cast-rolled finished coil is 7.0-8.0 mm.
Preferably, in the smelting stage, the hydrogen content in the melt is less than or equal to 0.1mL/100 gAl.
Compared with the prior art, the invention has the following beneficial effects:
based on specific component control, after the cast-rolled finished coil is roughly rolled to the thickness of 4.5-5.5mm, intermediate homogenizing annealing is carried out, the stress generated by rolling is eliminated, and the uniformity of an alloy structure is improved; in the subsequent pass rolling process, the alloy crystal grains are better crushed and refined through rolling; the tensile strength is obviously improved on the premise of meeting the ductility, so that the technical problems of reducing the production cost of the aluminum foil for the lithium battery and improving the production efficiency are solved. The tensile strength of the aluminum foil prepared by the method is larger than or equal to 270MPa, the elongation is larger than or equal to 4.0%, and the use performance of the aluminum foil for the power lithium battery is greatly improved.
Detailed Description
The invention aims to provide an aluminum foil for a lithium battery, which has high strength, good plasticity and stable processability, and is an alloy, and the aluminum foil for the lithium battery comprises the following components in percentage by mass: si: 0.01-0.2%, Fe: 0.45-0.9%, Cu: 0.01 to 0.2%, Mn: less than or equal to 0.02 percent, Zn: less than or equal to 0.04 percent, Ti: less than or equal to 0.04 percent and the balance of aluminum (Al).
Based on the components of the aluminum foil for the lithium battery, the specific embodiment of the invention also provides a preparation method of the aluminum foil for the high-performance lithium battery, which is a rolling control method under an alloy component system, and comprises the following steps:
(1) a smelting stage: heating and leveling the raw materials, and uniformly stirring, wherein the proportion of waste materials is less than or equal to 30 percent (aluminum plate coils with the same alloy components), and the balance is aluminum ingots, the smelting temperature is 730-740 ℃, and the converter-reversing temperature is 740-760 ℃.
(2) And (3) casting and rolling stage: during casting and rolling production, the temperature of a front box is 694-704 ℃, the hydrogen content in the melt is less than or equal to 0.1mL/100gAl, the casting and rolling speed is 850-1100 mm/min, the casting and rolling area is 55-75 mm, and the thickness of the prepared cast and rolled finished product roll is 7.0-8.0 mm;
(3) and (3) cold rolling stage: and (3) rough rolling the cast and rolled finished product coil to the thickness of 4.5-5.5mm, carrying out intermediate homogenization annealing treatment, continuously rolling to the thickness of 0.9-1.5 mm after intermediate annealing, carrying out longitudinal shearing edge, continuously rolling to the thickness of 0.2-0.3mm after edge cutting, carrying out longitudinal shearing edge, and finish rolling to the thickness of the finished product after edge cutting. Carrying out intermediate homogenizing annealing treatment, wherein the temperature is 515-540 ℃ for homogenizing annealing for 27-33 h;
the aluminum foil product for the lithium battery prepared by the method has the tensile strength of more than or equal to 270Mpa, the elongation of more than 4.0 percent and stable various performance indexes, and meets the processing requirements of the lithium battery through production verification.
The present invention will be further described with reference to the following examples. The following examples are only for illustrating the technical solutions of the present invention more clearly, and the protection scope of the present invention is not limited thereby.
Example 1:
the embodiment of the invention relates to an aluminum foil for a 1N00 lithium battery and a preparation method thereof. Firstly, the components and the mass percentage of the aluminum foil for the lithium battery are controlled as follows: si: 0.14%, Fe: 0.55%, Cu: 0.15%, Mn: 0.006%, Zn: 0.016%, Ti: 0.03 percent, and the balance of Al.
Based on the component control, the aluminum foil for the lithium battery is prepared and obtained by the following method:
(1) smelting: heating and leveling the raw materials, and uniformly stirring, wherein the proportion of waste materials is 30 percent (aluminum plate coils with the same alloy components), and the balance is aluminum ingots, and the melting temperature is 735 ℃. During smelting, the special refining agent is firstly used for refining at the temperature of 730 ℃ for 20min and then at the temperature of 740 ℃ for 20min, and the converter is turned over after the component adjustment meets the component control requirements, wherein the converter turning temperature is 750 ℃. The special refining agent is chlorine salt, and mainly has the main functions of spraying molten aluminum for refining during molten aluminum smelting, and the refining agent and impurities in the molten aluminumThe aluminum slag is removed, thereby playing the role of purifying the quality of the molten aluminum. (2) Casting and rolling: during casting and rolling production, the temperature of the degassing box is controlled at 725 ℃, the pressure of argon is controlled at 0.2Mpa, and the flow rate of gas is controlled at 2.0m3H, controlling the speed of a rotor at 550rpm, controlling the temperature of a filter box at 715 ℃, filtering by using a 40-mesh plus 60-mesh filter plate, controlling the temperature of a front box at 696 ℃, controlling a casting and rolling area at 65mm, controlling the opening degree of a casting nozzle at 7.5mm, controlling the casting and rolling linear speed at 950mm/min, and preparing a casting and rolling finished product coil with the thickness of 7.2mm and the width of 1420 mm;
(3) cold rolling: roughly rolling the cast-rolled finished product coil to 5.2mm, carrying out homogenization annealing at the temperature of 530 ℃ for 32h, sequentially cold rolling the cast-rolled finished product coil to the thickness of 2.5mm, 1.6mm and 0.95mm after the homogenization annealing, sequentially finishing the cast-rolled finished product coil to the width of 1385mm on the thickness of 0.95mm and the width of 1360mm on the longitudinal shearing side, sequentially finishing the cast-rolled finished product coil to the width of 0.45mm and the width of 1360mm on the longitudinal shearing side of 0.26mm, continuously rolling the cast-rolled finished product coil to the thickness of 0.105mm, 0.045mm, 0.021mm and 0.01mm on a foil mill, and controlling the rest rolls according to the conventional rolling;
the tensile strength of the aluminum foil product for the lithium battery prepared by the embodiment is 275mpa through a performance test, the elongation is 4.3%, and the aluminum foil product for the lithium battery has no broken strip in the subsequent carbon coating and cold pressing processes of the lithium battery, so that the required performance of the aluminum foil for the lithium battery is met.
Example 2:
the embodiment of the invention relates to an aluminum foil for a 1N00 lithium battery and a preparation method thereof. Firstly, the components and the mass percentage of the aluminum foil for the lithium battery are controlled as follows: si: 0.13%, Fe: 0.65%, Cu: 0.16%, Mn: 0.006%, Zn: 0.016%, Ti: 0.03 percent, and the balance of Al. Based on the above component control, the aluminum foil for lithium battery is prepared and obtained, and the preparation method is completely the same as the method described in the first embodiment.
The tensile strength of the aluminum foil product for the lithium battery prepared by the embodiment is 280mpa through a performance test, the elongation is 4.2%, and the aluminum foil product for the lithium battery has no broken strip in the subsequent carbon coating and cold pressing processes of the lithium battery, so that the required performance of the aluminum foil for the lithium battery is met.
Comparative example 1:
the invention relates to an aluminum foil for a lithium battery and a preparation method thereof. Firstly, the components and the mass percentage of the aluminum foil for the lithium battery are controlled as follows: si: 0.12%, Fe: 0.43%, Cu: 0.12%, Mn: 0.005%, Zn: 0.013%, Ti: 0.03 percent, and the balance of Al.
Comparative example 1 the same procedure and the like were the same as in example.
Comparative example 2:
the embodiment of the invention relates to an aluminum foil for a 1N00 lithium battery and a preparation method thereof. Firstly, the components and the mass percentage of the aluminum foil for the lithium battery are controlled as follows: si: 0.14%, Fe: 0.55%, Cu: 0.15%, Mn: 0.006%, Zn: 0.016%, Ti: 0.03 percent, and the balance of Al. Comparative example 2 the composition was carried out as in example 1, with the difference that the intermediate homogenization annealing was carried out at 3.8mm rolling, the annealing process being identical
Comparative example 3
The embodiment of the invention relates to an aluminum foil for a 1N00 lithium battery and a preparation method thereof. Firstly, the components and the mass percentage of the aluminum foil for the lithium battery are controlled as follows: si: 0.14%, Fe: 0.55%, Cu: 0.15%, Mn: 0.006%, Zn: 0.016%, Ti: 0.03 percent, and the balance of Al. Comparative example 2 the composition was carried out as in example 1, except that the intermediate annealing was carried out at a rolling speed of 5.2mm, the annealing process was not uniform and annealing at 420 c for 20H was used.
Based on the above composition control, an aluminum foil for a lithium battery was prepared, which was different from that described in example one in the above points, and was otherwise completely the same as that described in the above points.
The aluminum foil product for lithium battery prepared by the comparative example has tensile strength of 251mpa and elongation of 3.8% through performance test, and is shown in table one:
table one: results of Performance test of examples 1 and 2 and comparative example
| Tensile strength/Mpa | Elongation/percent | |
| Example 1 | 275 | 4.3 |
| Example 2 | 280 | 4.2 |
| Comparative example 1 | 251 | 3.8 |
| Comparative example 2 | 255 | 4.0 |
| Comparative example 3 | 270 | 3.0 |
As can be seen from table one, under the alloy composition and preparation conditions of the present invention, the aluminum foil products for lithium batteries obtained by rolling according to the embodiments 1 and 2 have significantly improved tensile strength with ensured elongation ductility, compared to the aluminum foil products for lithium batteries obtained by comparative example. The reason is that the iron element can form solid solution and a second phase compound in the alloy solidification process, the strength of the alloy is improved, and simultaneously, the crystal grains can be refined to a certain degree. In the embodiments 1 and 2 of the invention, under the condition of the alloy components of the invention, compared with the comparative example 1, after the cast and rolled finished coil is roughly rolled to the thickness of 4.5-5.5mm, intermediate homogenizing annealing is carried out, so that not only is the stress generated by rolling eliminated, but also the alloy phase distribution and the structure uniformity are improved; in the subsequent pass rolling process, alloy crystal grains are better crushed and refined through rolling, and the comprehensive performance of tensile strength and elongation is obviously improved. The intermediate annealing thickness in the comparative example 2 is relatively thin and is closer to the pass of the finished product, the work hardening effect in the subsequent rolling process is slightly weaker than that of the annealing process in the invention, the tensile strength is relatively low, the intermediate annealing process in the comparative example 3 is relatively to the annealing process in the invention, the aluminum foil does not obtain sufficient homogenization effect in the annealing process, the grain and the second phase are thinned and weakened in the subsequent rolling process, and the elongation of the finished product is reduced.
The above description is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, several modifications and variations can be made without departing from the technical principle of the present invention, and these modifications and variations should also be regarded as the protection scope of the present invention.
Claims (10)
1. The aluminum foil for the 1N00 lithium battery is characterized in that the aluminum foil comprises the components of Al, Si, Fe, Cu, Mn, Zn and Ti; the mass percentages of Si, Fe, Cu, Mn, Zn and Ti are as follows: si: 0.01-0.2%, Fe: 0.45-0.9%, Cu: 0.01 to 0.2%, Mn: less than or equal to 0.02 percent, Zn: less than or equal to 0.04 percent, Ti: less than or equal to 0.04 percent.
2. The method of preparing an aluminum foil for a 1N00 lithium battery as claimed in claim 1, wherein the composition control of the aluminum foil for a 1N00 lithium battery as claimed in claim 1 comprises the steps of: smelting, casting rolling, cold rolling and foil rolling, wherein in the cold rolling stage, after the cast and rolled finished coil is roughly rolled to the thickness of 4.5-5.5mm, intermediate homogenization annealing treatment is carried out.
3. The method for preparing the aluminum foil for the 1N00 lithium battery as claimed in claim 2, wherein the intermediate homogenizing annealing treatment specifically comprises the following steps: homogenizing and annealing at 515-540 deg.C for 27-33 h.
4. The method of claim 2, wherein the cold rolling step, after the intermediate annealing, further comprises:
rolling to a longitudinal shearing edge of 0.9-1.5 mm, rolling to a longitudinal shearing edge of 0.2-0.3mm, and finish rolling to the thickness of a finished product.
5. The method for preparing the aluminum foil for the 1N00 lithium battery as claimed in claim 2, wherein before the cold rolling stage, a smelting stage and a casting-rolling stage are further included;
the smelting stage comprises: heating and leveling the raw materials, and uniformly stirring, wherein the proportion of the waste materials is less than or equal to 30%; the waste materials are aluminum plate coils with the same alloy components, the rest are aluminum ingots, the smelting temperature is 730-740 ℃, and the converter-reversing temperature is 740-760 ℃.
6. The method for preparing the aluminum foil for the 1N00 lithium battery as claimed in claim 5, wherein in the casting and rolling stage: the temperature of the front box is 694-704 ℃, the casting and rolling speed is 850-1100 mm/min, the casting and rolling area is 55-75 mm, and the temperature of the roll surface is less than or equal to 80 ℃.
7. The method of claim 2, wherein the aluminum foil for 1N00 lithium battery is prepared by refining at 730 ℃ for 20min and then at 740 ℃ for 20min with a special refining agent, adjusting the components, and then turning over the aluminum foil to 750 ℃.
8. The method of claim 2, wherein the refining agent is chlorine salt.
9. The method of claim 2, wherein the thickness of the cast-rolled finished roll is 7.0-8.0 mm.
10. The method of claim 2, wherein in the melting stage, the hydrogen content in the melt is less than or equal to 0.1mL/100 gAl.
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| CN117230348A (en) * | 2023-09-18 | 2023-12-15 | 华北铝业新材料科技有限公司 | 1100B high-strength battery foil and preparation method thereof |
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