CN114798770B - High-altitude aluminum foil and preparation method and application thereof - Google Patents
High-altitude aluminum foil and preparation method and application thereof Download PDFInfo
- Publication number
- CN114798770B CN114798770B CN202210149615.5A CN202210149615A CN114798770B CN 114798770 B CN114798770 B CN 114798770B CN 202210149615 A CN202210149615 A CN 202210149615A CN 114798770 B CN114798770 B CN 114798770B
- Authority
- CN
- China
- Prior art keywords
- aluminum foil
- cleaning
- dyne
- micro
- rolling
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 229910052782 aluminium Inorganic materials 0.000 title claims abstract description 159
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 title claims abstract description 159
- 239000011888 foil Substances 0.000 title claims abstract description 159
- 238000002360 preparation method Methods 0.000 title claims abstract description 7
- 238000004140 cleaning Methods 0.000 claims abstract description 65
- 239000007788 liquid Substances 0.000 claims abstract description 39
- 238000000034 method Methods 0.000 claims abstract description 33
- 238000004519 manufacturing process Methods 0.000 claims abstract description 25
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 claims abstract description 7
- 229910001416 lithium ion Inorganic materials 0.000 claims abstract description 7
- 238000005096 rolling process Methods 0.000 claims description 31
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 29
- 229910052799 carbon Inorganic materials 0.000 claims description 29
- 238000000576 coating method Methods 0.000 claims description 24
- 239000011248 coating agent Substances 0.000 claims description 22
- 238000001035 drying Methods 0.000 claims description 19
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 18
- 239000002002 slurry Substances 0.000 claims description 14
- RTZKZFJDLAIYFH-UHFFFAOYSA-N Diethyl ether Chemical compound CCOCC RTZKZFJDLAIYFH-UHFFFAOYSA-N 0.000 claims description 6
- 238000003756 stirring Methods 0.000 claims description 6
- 239000000463 material Substances 0.000 claims description 5
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims description 4
- 230000009467 reduction Effects 0.000 claims description 4
- ZWRDBWDXRLPESY-UHFFFAOYSA-N n-benzyl-n-ethylethanamine Chemical compound CCN(CC)CC1=CC=CC=C1 ZWRDBWDXRLPESY-UHFFFAOYSA-N 0.000 claims description 3
- 238000004806 packaging method and process Methods 0.000 claims description 3
- 229920000058 polyacrylate Polymers 0.000 claims description 3
- 235000013855 polyvinylpyrrolidone Nutrition 0.000 claims description 3
- 229920000036 polyvinylpyrrolidone Polymers 0.000 claims description 3
- 239000001267 polyvinylpyrrolidone Substances 0.000 claims description 3
- 238000004804 winding Methods 0.000 claims description 2
- 239000005030 aluminium foil Substances 0.000 claims 2
- 230000000694 effects Effects 0.000 abstract description 12
- 238000005516 engineering process Methods 0.000 abstract description 11
- 230000008569 process Effects 0.000 abstract description 9
- 239000000853 adhesive Substances 0.000 abstract description 4
- 230000001070 adhesive effect Effects 0.000 abstract description 4
- 230000008859 change Effects 0.000 abstract description 2
- 231100000957 no side effect Toxicity 0.000 abstract description 2
- 230000007613 environmental effect Effects 0.000 abstract 1
- 239000003921 oil Substances 0.000 description 13
- 238000005406 washing Methods 0.000 description 13
- 238000009736 wetting Methods 0.000 description 9
- 230000007547 defect Effects 0.000 description 7
- 230000000052 comparative effect Effects 0.000 description 6
- 238000000137 annealing Methods 0.000 description 5
- 238000010926 purge Methods 0.000 description 5
- 239000010731 rolling oil Substances 0.000 description 5
- 239000002253 acid Substances 0.000 description 4
- 239000003513 alkali Substances 0.000 description 4
- 239000006255 coating slurry Substances 0.000 description 4
- 239000007789 gas Substances 0.000 description 4
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 3
- 230000002950 deficient Effects 0.000 description 3
- 238000005238 degreasing Methods 0.000 description 3
- 229910052744 lithium Inorganic materials 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- 238000004381 surface treatment Methods 0.000 description 3
- 125000004429 atom Chemical group 0.000 description 2
- 238000000432 density-gradient centrifugation Methods 0.000 description 2
- 238000001514 detection method Methods 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 238000007599 discharging Methods 0.000 description 2
- 239000006185 dispersion Substances 0.000 description 2
- 239000003344 environmental pollutant Substances 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 231100000719 pollutant Toxicity 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 238000007581 slurry coating method Methods 0.000 description 2
- 239000002904 solvent Substances 0.000 description 2
- 239000000758 substrate Substances 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 230000037303 wrinkles Effects 0.000 description 2
- KWIUHFFTVRNATP-UHFFFAOYSA-N Betaine Natural products C[N+](C)(C)CC([O-])=O KWIUHFFTVRNATP-UHFFFAOYSA-N 0.000 description 1
- KWIUHFFTVRNATP-UHFFFAOYSA-O N,N,N-trimethylglycinium Chemical compound C[N+](C)(C)CC(O)=O KWIUHFFTVRNATP-UHFFFAOYSA-O 0.000 description 1
- CBENFWSGALASAD-UHFFFAOYSA-N Ozone Chemical compound [O-][O+]=O CBENFWSGALASAD-UHFFFAOYSA-N 0.000 description 1
- 241000405070 Percophidae Species 0.000 description 1
- 238000005411 Van der Waals force Methods 0.000 description 1
- 239000011149 active material Substances 0.000 description 1
- 238000004378 air conditioning Methods 0.000 description 1
- 239000006256 anode slurry Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 229960003237 betaine Drugs 0.000 description 1
- 230000033228 biological regulation Effects 0.000 description 1
- 239000006229 carbon black Substances 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000000084 colloidal system Substances 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 230000008021 deposition Effects 0.000 description 1
- POULHZVOKOAJMA-UHFFFAOYSA-M dodecanoate Chemical compound CCCCCCCCCCCC([O-])=O POULHZVOKOAJMA-UHFFFAOYSA-M 0.000 description 1
- 239000003995 emulsifying agent Substances 0.000 description 1
- 150000002148 esters Chemical class 0.000 description 1
- 238000011049 filling Methods 0.000 description 1
- 125000000524 functional group Chemical group 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 125000004435 hydrogen atom Chemical group [H]* 0.000 description 1
- 229940070765 laurate Drugs 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 239000002357 osmotic agent Substances 0.000 description 1
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 description 1
- 230000010287 polarization Effects 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 230000002195 synergetic effect Effects 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
- 238000002834 transmittance Methods 0.000 description 1
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B45/00—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
- B21B45/02—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills for lubricating, cooling, or cleaning
- B21B45/0269—Cleaning
- B21B45/0275—Cleaning devices
-
- 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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B15/00—Arrangements for performing additional metal-working operations specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
- B21B15/0007—Cutting or shearing the product
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B3/00—Rolling materials of special alloys so far as the composition of the alloy requires or permits special rolling methods or sequences ; Rolling of aluminium, copper, zinc or other non-ferrous metals
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B3/00—Rolling materials of special alloys so far as the composition of the alloy requires or permits special rolling methods or sequences ; Rolling of aluminium, copper, zinc or other non-ferrous metals
- B21B2003/001—Aluminium or its alloys
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B15/00—Arrangements for performing additional metal-working operations specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
- B21B2015/0057—Coiling the rolled product
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Cell Electrode Carriers And Collectors (AREA)
- Cleaning And De-Greasing Of Metallic Materials By Chemical Methods (AREA)
Abstract
The invention discloses a preparation method of high-dyne aluminum foil, which is characterized in that a step of slightly cleaning the aluminum foil by adding cleaning liquid into a trough of a slightly concave roller is added, so that the dyne value of the aluminum foil is greatly improved, the dyne value is improved to 60 dyne from the original 30 dyne, and the gap of the high-dyne aluminum foil technology is filled; and the micro-concave roller is used for cleaning, so that the production rate is greatly improved. The method of the invention has the advantages of small cleaning liquid amount and accurate control of the dosage of the cleaning liquid by adjusting the mesh number of the micro-concave rollers. The method has obvious deoiling effect, does not generate harmful gas in the using process, and has the characteristics of environmental protection and no pollution. The method can obviously improve the adhesive force of the aluminum foil, has no side effect on the mechanical property of the aluminum foil, and the obtained aluminum foil dyne value is kept stable and basically does not generate attenuation change in the production process. Further ensuring the application of the obtained aluminum foil in lithium ion batteries.
Description
Technical Field
The invention belongs to the technical field of aluminum foil processing, and relates to a high-altitude aluminum foil and a preparation method and application thereof.
Background
Due to the rapid development of new energy vehicles worldwide, the demand for lithium batteries is increasingly vigorous, and meanwhile, the demand for battery aluminum foils is rapidly pulled. According to the data, the aluminum foil yield in China is in a stable increasing trend in 2016-2020, and the increasing speed is generally 4% -5%. In 2020, the aluminum foil yield in China is 415 ten thousand tons, and the same ratio is increased by 3.75%. According to the disclosure of China's nonferrous metal processing industry association on China's aluminum foil industry development peak forum, the aluminum foil production yield in China almost accounts for 60% -65% of the global aluminum foil industry.
The carbon-coated aluminum foil in the aluminum foil can effectively reduce polarization and improve rate capability; dynamic resistance during charge and discharge is improved, the consistency of differential pressure of the module is improved, and the cost of the battery pack is greatly reduced; the adhesive force between the active material and the current collector is improved, and the manufacturing cost of the pole piece is reduced; the surface dyne value of the substrate is improved, and the easy-to-coat performance of the substrate is enhanced. However, with the rapid rise of the lithium battery industry, the quality requirements on the aluminum foil for the battery, including the carbon-coated aluminum foil, are higher and higher, and the dyne value requirements on the aluminum foil for the battery are also higher and higher.
The production technology of the aluminum foil for the traditional high-power battery has the following technical defects:
1. and (3) annealing: the traditional method for improving the surface wetting tension of the single-light aluminum foil mainly comprises the steps of carrying out annealing treatment, discharging rolling oil on the surface of the aluminum foil through long-time high temperature, and enabling the surface of the aluminum foil to be oilless, so that the surface wetting tension of the aluminum foil can be improved to a certain extent. However, the product is a battery foil product, the requirement is a hard state (H18 state), and the tensile strength after long-time high-temperature annealing cannot meet the requirement; and because the aluminum foil is a double-sided light product, the porosity between the aluminum foil layers is small (< 5%), and an oil film cannot be effectively removed, so that the process cannot be applied. Summarizing, using an annealing process, the tensile strength of the aluminum foil is reduced, the elongation of the aluminum foil is increased and degreasing is insufficient.
2. Surface purging: the duckbill fan-shaped purging device is arranged at the rolling outlet side, and aluminum foil immersed in the rolling oil purges the rolling oil on the surface through purging with high pressure. The surface of the aluminum foil after being purged has no obvious oil stain. However, since the aluminum foil having a thickness of 15 μm or less is left with a roll gap, oil spots on the surface cannot be sufficiently removed, and oil is added to the surface of the aluminum foil after rolling to various degrees. In summary, the use of surface purging has the disadvantages of a small application range, poor effect on aluminum foils with a thickness of 15 μm or less, and insufficient degreasing.
3. Slitting surface treatment: when the aluminum foil is slit, the aluminum foil is treated by high-temperature discharge, an oil film on the surface of the aluminum foil is instantaneously broken up, ozone generated by the high-voltage discharge can effectively prevent functional groups broken up on a material surface from being polymerized, and meanwhile, the discharge negative-pressure end can suck oil gas subjected to surface treatment, so that surface residual oil is reduced, and a dyne value is improved. When the aluminum foil is slit, the rewinding speed is less than or equal to 100m/min, the distance between the discharge rewinding equipment and the surface of the aluminum foil is less than or equal to 2mm, the power of the discharge rewinding equipment is 10-15 KW, and the number of the processed aluminum foils is 6. The technical defects are that the production efficiency is low, the production capacity which does not meet the current requirements is not met, the aluminum foil dyne lifting effect is low, and generally, only 1 to 3 dynes can be lifted on the basis of the original dyne of the aluminum foil. In summary, the use of the slit surface treatment has the main disadvantage of small dyne lifting on the aluminum foil for the battery and insignificant effect.
4. Acid washing, alkali washing and water washing processes: in the production link of air-conditioning foil or embossed oxide plate (the thickness is more than or equal to 0.2 mm), the processes of acid washing, alkali washing and water washing are used, the surface of an aluminum plate is cleaned to remove oil films on the surface, then the aluminum plate enters a long oven, and the liquid on the surface is removed at high temperature in the oven. The aluminum plate surface is rapidly oxidized into aluminum oxide, so that the wetting tension of the surface is improved. However, this technique is only useful for aluminum sheets, and is not applicable to aluminum foil (thickness 15 μm or less) products. The foil is thin and deforms when passing through liquid, resulting in wrinkles. In addition, the cleaning speed is slow (generally only 5-10 m/min), and the mass production requirement cannot be formed at all. Summarizing, the acid washing, alkali washing and water washing processes have the defects of small application range and inapplicability to products with the aluminum foil thickness less than or equal to 15 mu m; the cost is high, and the dosage of the washing liquid cannot be effectively controlled; the production efficiency is low, the cleaning speed is slow, and the general speed is only 5-10 m/min.
The carbon-coated aluminum foil has the following technical defects:
5. stirring the slurry: on carbon-coated aluminum foil (a product with high added value), the slurry plays an indispensable role (water-based slurry is adopted by our department), the slurry is placed in a stirring barrel, a motor is started, a shaft with blades is inserted into the coating for rotation after variable frequency speed regulation, so that the coating is in a ring-shaped rolling mode, vortex is formed in the middle, stirring is continued, slurry agglomerates are scattered, and the mechanical dispersion process of deposition and precipitation is not carried out, so that the smoothness and uniformity of the slurry are directly influenced by the quality of dispersion.
6. Surface baking: on aluminum foil (a product with high added value) for carbon coating, when extremely thin carbon black on the surface cannot be adhered, the aluminum foil is put into a baking oven for baking, and the baking method is as follows: the aluminum foil was stretched, passed through a roll system of an oven (oven length: about 40 m), heated to 120℃and the speed of the tape was controlled at about 20 m/min. The surface wetting tension can be increased from original 30dyn to 31dyn. However, this process has some problems: firstly, the speed is low, and the requirement of mass production cannot be met; the second pass is more in number, which tends to cause pitting (irregularities) and increase the probability of defective appearance, and the third pass is more in number, which tends to wrinkle. Summarizing, the surface baking is used, the speed of producing the aluminum foil is low, the productivity is reduced, and defective products with defects such as concave-convex points on the surface quality of the aluminum foil are easy to appear because more roller systems are needed in the technical industrial process.
7. Coating aluminum foil: the method comprises the steps of single-station unreeling, feeding traction, front coating, horizontal drying box, deviation rectifying, cooling traction, back coating, horizontal drying box, deviation rectifying, discharging traction and double-station reeling. 1 front side coating +1 back side continuous coating/longitudinal multiple strip or transverse gap blank (automatic overprinting) continuous coating is completed at one time. The alignment and the registration of the front pattern and the back pattern can be completed, but the oil spots on the surface are not completely removed, and the coated aluminum foil surface is also subjected to different degrees of missing coating.
In the field of battery foil, the dyne value is generally divided into three intervals: (1) < 30dyn belongs to low dyne value; (2) the dyne value is 30-31 dyn, which belongs to the conventional dyne value; (3) the dyne value is more than or equal to 32dyn, and belongs to the dyne interval. At present, the industry is in a blank stage in the aspect of the technology of effectively producing the aluminum foil for the battery in the high dyne region, so that the exploration of a technical scheme for improving the dyne value of the aluminum foil is very important.
Disclosure of Invention
In order to overcome the defects of the prior art, one of the purposes of the invention is to provide a preparation method of an aluminum foil with high dyne, and the aluminum foil obtained by the method has the dyne value increased to 60 dyne, so that the production speed is high and the application range is wide.
It is a second object of the present invention to provide an aluminum foil.
It is a further object of the present invention to provide the use of the above-mentioned up to lead aluminum foil in lithium ion batteries.
One of the purposes of the invention is realized by adopting the following technical scheme:
a method for preparing a high-grade aluminum foil, comprising the following steps:
(1) Rough rolling, middle rolling and finish rolling are carried out on the aluminum foil material to obtain aluminum foil;
(2) Slitting the aluminum foil obtained in the step (1);
(3) Carrying out micro-concave cleaning and drying on the aluminum foil cut in the step (2); the micro-concave cleaning is to fill cleaning liquid into a trough of the micro-concave roller;
(4) And (3) rolling and packaging the aluminum foil obtained in the step (3).
Further, the aluminum foil is double-sided light aluminum foil, single-sided light aluminum foil or carbon-coated aluminum foil.
Further, when the aluminum foil is a carbon-coated aluminum foil, the method further comprises the steps of stirring and dispersing carbon-coated slurry, feeding the carbon-coated slurry into a trough of a micro-concave roller, and then coating and drying the front and back surfaces of the aluminum foil after micro-concave cleaning and drying.
Further, the cleaning liquid for slightly cleaning in the step (3) comprises 10-15 parts of diethylbenzylamine, 1-3 parts of polyvinylpyrrolidone, 4-7 parts of laurobetaine, 2-5 parts of isomeric alcohol ether, 5-11 parts of polyacrylate and 100-200 parts of water.
Further, the cleaning rate in the step (3) is 180m/min; the drying temperature is 60-80 ℃ and the drying time is 40-90s.
Further, the rolling reduction of the rolling and finish rolling in the step (1) is 35% -45% and 30% -50% respectively.
Further, the slitting speed in the step (2) is less than or equal to 300m/min.
Further, the winding speed in the step (4) is less than or equal to 100m/min.
The second purpose of the invention is realized by adopting the following technical scheme:
a high-grade aluminum foil prepared by the method.
The third purpose of the invention is realized by adopting the following technical scheme:
the Gao Dayin aluminum foil is applied to the preparation of lithium ion batteries.
Compared with the prior art, the invention has the beneficial effects that:
compared with the prior art, the method has the advantages that the step of slightly cleaning the aluminum foil by adding the cleaning liquid in the trough of the slightly concave roller is greatly improved, the dyne value of the aluminum foil is improved to 60 dyne from the original 30 dyne, and the gap of the technology of the high dyne aluminum foil is filled; and the micro-concave roller is used for cleaning, the speed can reach 180m/min, and the production rate is greatly improved. The method of the invention uses little cleaning solution, and the surface of the aluminum foil is covered with about 0.05g/m 2 The improvement effect can be achieved. And the dosage of the cleaning liquid can be accurately controlled by adjusting the mesh number of the micro-concave rollers. The method has obvious deoiling effect, and the density of the cleaning liquid is less than that of the residual rolling oil on the surface of the aluminum foil, so that the method is suitable for a density gradient centrifugation method, and the deoiling effect is further improved. No harmful gas is generated in the using process, and the environment-friendly and pollution-free characteristics are achieved. The method can obviously improve the adhesive force of the aluminum foil, has no side effect on the mechanical property of the aluminum foil, and the obtained aluminum foil dyne value is kept stable and basically does not generate attenuation change in the production process. Further ensuring the application of the obtained aluminum foil in lithium ion batteries.
Drawings
Fig. 1 is a schematic view of a coated gravure roll according to the present invention, wherein fig. a is a blank, and fig. B is a schematic view after cleaning solution is added.
Detailed Description
The present invention will be further described with reference to the accompanying drawings and detailed description, wherein it is to be understood that, on the premise of no conflict, the following embodiments or technical features may be arbitrarily combined to form new embodiments.
Example 1
A method for preparing a high-grade aluminum foil, comprising the following steps:
(1) And performing rough rolling, medium rolling and finish rolling on the aluminum foil material to obtain the aluminum foil with the thickness of 0.015 mm. Wherein the aluminum foil material comprises, by mass, 0.25% of Fe, 0.05% of Si, 0.04% of Cu, 0.02% of Ti, 0.08% of Mn, 0.03% of Mg, 0.031% of Ti and the balance of Al. The oil index of the intermediate rolling and the finish rolling can ensure the initial wetting tension of the obtained aluminum foil, and the main indexes are shown in table 1:
| each index | Middle rolling | Finish rolling |
| Viscosity target value (mm) 2 /s) | 1.7-2.05 | 1.8-2.1 |
| Transmittance (%) | ≥80 | ≥90 |
| Colloid (g/L) | ≤20 | ≤10 |
| Alcohol content (%) | 1.0-2.0 | 3.0-5.0 |
| Ester content (%) | 5.0-7.0 | 10.0-12.0 |
The roll standards for the intermediate rolling and the finish rolling are shown in table 2:
TABLE 2
| Each index | Middle rolling | Finish rolling |
| Roller diameter (mm) | 270-280 | 270-280 |
| Convexity (mm) | 60‰ | 80‰ |
| Roughness (mu m) | 0.3-0.15 | 0.12-0.14 |
| Reduction of depression | 35％-45％ | 30％-50％ |
(2) And (3) slitting the aluminum foil obtained in the step (1), and transferring to a slitting process within 6 hours after rolling, wherein the slitting rate is less than or equal to 300m/min.
(3) Carrying out micro-concave cleaning and drying on the aluminum foil cut in the step (2), filling cleaning liquid into a trough of a micro-concave roller (shown in figure 1), wherein the coating amount of the cleaning liquid is 0.05g/cm 2 The cleaning rate was 180m/min. Cleaning and baking aluminum foil by using carbon coating machine, and replacing with cleaning liquidAnd (3) coating carbon slurry on a carbon coating machine. When the carbon coating machine is rewinding, the micro-concave roller is completely immersed in the cleaning liquid, the concave part of the micro-concave roller is filled with the cleaning liquid, the aluminum foil is directly contacted with the micro-concave roller through the roller of the carbon coating machine, the cleaning liquid is transferred onto the aluminum foil, the aluminum foil after the transfer of the cleaning liquid is immediately sent into the oven, and the solvent of the cleaning liquid is volatilized and dried through the drying device. The drying temperature is 60-80 ℃ and the drying time is 40-90s.
The cleaning liquid comprises 2 parts of polyvinylpyrrolidone, 11 parts of diethylbenzylamine, 5 parts of laurate betaine, 3 parts of osmotic agent isomeric alcohol ether, 6 parts of emulsifier polyacrylate and 150 parts of water.
(4) And (3) rolling and packaging the aluminum foil obtained in the step (3), wherein the rolling speed is less than or equal to 100m/min, and the high-speed aluminum foil is obtained.
Example 2
A method for preparing a high-grade aluminum foil, comprising the following steps:
example 2 differs from example 1 in that: and (3) after carrying out micro-concave cleaning and drying on the aluminum foil, removing the cleaning liquid in the trough, uniformly stirring and dispersing the water-based carbon-coated slurry, feeding the water-based carbon-coated slurry into the trough of the micro-concave roller through a feed pump, and then coating and drying the front and back surfaces of the aluminum foil.
Otherwise, as in example 1, a high-up-to-factor carbon-coated aluminum foil was obtained.
Comparative example 1
Comparative example 1 differs from example 1 in that: the micro-gravure roll in step (3) was adjusted to a plain-gloss roll with cleaning solution, and the rest was the same as in example 1.
Comparative example 2
Comparative example 2 differs from example 1 in that: the cleaning solution in the step (3) was adjusted to a commercially available cleaning solution (model SX 705), and the remainder was the same as in example 1.
The dyne value is detected by standard dyne liquid comparison, and the surface wetting tension of the aluminum foil rolled in the detection example 1 and the carbon-coated aluminum foil rolled in the detection example 2 is up to be more than or equal to 60 dyne value. Comparative example 1 differs from example 1 in that a plain smooth roll was used instead of a micro-gravure roll, and the resulting aluminum foil had a surface wetting tension of at most 33 dynes. Comparative example 2 differs from example 1 in that a commercially available cleaning solution was used instead of the cleaning solution of the present invention, and the resulting aluminum foil had a surface wetting tension of up to 30 dynes. Therefore, the aluminum foil is cleaned in the production process by adopting the method of matching the micro-concave roller with the cleaning liquid, and the surface wetting tension of the aluminum foil can be effectively improved.
The cleaning liquid disclosed by the invention is subjected to oil stain removal by utilizing a chemical superposition synergistic effect, a large amount of experimental data are obtained, the most proper ratio of the oil removal effect of the cleaning liquid after use to the aluminum foil dyne lifting effect is obtained, and the density of the original cleaning liquid after the ratio is smaller than the residual rolling oil density on the surface of the aluminum foil for a battery, so that the oil removal effect is further improved by applying a density gradient centrifugation method (a substance separation method). The carbon coating slurry used in the carbon coating process of the lithium battery in the current market is basically water-based slurry, so that hydrogen atoms which form strong polar bonds with atoms with great electronegativity exist in the water-based carbon coating slurry and up to the cleaning solution, and atoms which have smaller radius, larger electronegativity, lone pair electrons and partial negative charges exist in the water-based carbon coating slurry, so that hydrogen bonds with stronger van der Waals force are easily formed, and the bonding force between the water-based carbon coating slurry and the aluminum foil is enhanced in the carbon coating process of the battery.
The invention puts the cleaning liquid into the trough of the micro-concave roller to carry out the micro-concave cleaning step on the aluminum foil, when the carbon coating machine is rewinding, the micro-concave roller is completely immersed into the original cleaning liquid, the concave part of the micro-concave roller is filled with the cleaning liquid, the aluminum foil is directly contacted with the micro-concave roller through the roller of the carbon coating machine and the cleaning liquid is transferred onto the aluminum foil, the aluminum foil after the cleaning liquid is transferred into the oven immediately, and the solvent of the cleaning liquid is volatilized and dried through the drying device.
Through a large amount of experimental data, the aluminum foil dyne value for the battery can be obviously improved by only a trace amount of the cleaning liquid provided by the invention, and the data show that the surface of the aluminum foil is covered by about 0.05g/m 2 The improvement effect can be achieved, and the peak value is reached after the surface coverage is increased to a certain value. And because the dosage of the original up-to-factor cleaning liquid can be accurately and correctly controlled through the adjustment of the mesh number of the micro-concave rollers, the dosage can be accurately up to the required target up-to-factor value. By comparing the dosage and effect of the traditional technologies such as acid washing, alkali washing and water washing,the high efficiency and the controllability of the new technology are obviously highlighted.
Through experimental tracking using the technology of the invention, no pollutant is generated in the production process, and the volatile gas of the cleaning liquid (about 80-90% of the components in the cleaning liquid are water) is water vapor when the cleaning liquid is baked and dried in an oven, so that other harmful pollutant gases are not generated.
The aluminum foil for the battery is generally improved by the conventional technology, and meanwhile, the performance of other aspects of the aluminum foil can be influenced, for example, the aluminum foil for the battery is subjected to an annealing process, and the tensile strength and the elongation of the aluminum foil for the battery are reduced to different degrees. By testing the aluminum foil produced using the present technique, the data shows that the mechanical properties of the aluminum foil are unchanged.
After the aluminum foil for the battery is lifted by the conventional technology, the aluminum foil is quickly lowered along with the time, and the reason for the lowering is generally considered that the surface of the aluminum foil is contacted with air water molecules, so that the aluminum foil is lowered. The aluminum foil for the battery produced by the novel technology has the advantages that the residual high-level cleaning liquid on the surface of the aluminum foil well isolates the aluminum foil from certain chemical or physical reaction with air water molecules, so that the aluminum foil dyne value is basically stable and unchanged after long-time test, and no obvious descending trend appears.
In conclusion, the invention overcomes the defects of low aluminum foil dyne value, insufficient aluminum foil degreasing, low aluminum foil production speed and low productivity of the traditional technology, and greatly reduces the probability of defective products such as aluminum foil surface quality concave-convex points and the like caused by more roller systems in the production process; the appearance of the anode slurry coating or the carbon-coated slurry coating in the production process of the lithium ion battery is greatly improved, and the coating step is uniform, fine and smooth and has strong adhesive force. Provides a good foundation for the subsequent application in lithium ion batteries.
The above embodiments are only preferred embodiments of the present invention, and the scope of the present invention is not limited thereto, but any insubstantial changes and substitutions made by those skilled in the art on the basis of the present invention are intended to be within the scope of the present invention as claimed.
Claims (9)
1. A method for preparing a high-grade aluminum foil, which is characterized by comprising the following steps:
(1) Rough rolling, middle rolling and finish rolling are carried out on the aluminum foil material to obtain aluminum foil;
(2) Slitting the aluminum foil obtained in the step (1);
(3) Carrying out micro-concave cleaning and drying on the aluminum foil cut in the step (2); the micro-concave cleaning is to fill cleaning liquid into a trough of the micro-concave roller;
(4) Rolling and packaging the aluminum foil obtained in the step (3);
in the step (3), the cleaning liquid for slightly cleaning comprises 10-15 parts of diethylbenzylamine, 1-3 parts of polyvinylpyrrolidone, 4-7 parts of laurobetaine, 2-5 parts of isomeric alcohol ether, 5-11 parts of polyacrylate and 100-200 parts of water.
2. The method of producing a high-grade aluminum foil as claimed in claim 1, wherein the aluminum foil is a double-sided light aluminum foil or a single-sided light aluminum foil.
3. The method for producing a high-grade aluminum foil as claimed in claim 1, wherein the step (3) comprises the steps of stirring and dispersing the carbon-coated slurry and then feeding the slurry into a trough of a micro-concave roller, and then coating and drying the front and back surfaces of the aluminum foil after micro-concave cleaning and drying to obtain the carbon-coated aluminum foil.
4. The method for producing a high-grade aluminum foil according to claim 1, wherein the cleaning rate in the step (3) is 180m/min; the drying temperature is 60-80 ℃ and the drying time is 40-90s.
5. The method for producing a high-grade aluminum foil as claimed in claim 1, wherein the rolling reduction of the rolling and the finish rolling reduction of the step (1) are 35% -45% and 30% -50%, respectively.
6. The method for producing a high-grade aluminum foil as claimed in claim 1, wherein the slitting rate in the step (2) is 300m/min or less.
7. The method for producing a high-power aluminum foil according to claim 1, wherein the winding rate in the step (4) is not more than 100m/min.
8. An aluminum foil as claimed in any one of claims 1 to 7.
9. Use of up to factor aluminium foil according to claim 8, wherein the up to factor aluminium foil is used in the preparation of lithium ion batteries.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210149615.5A CN114798770B (en) | 2022-02-18 | 2022-02-18 | High-altitude aluminum foil and preparation method and application thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210149615.5A CN114798770B (en) | 2022-02-18 | 2022-02-18 | High-altitude aluminum foil and preparation method and application thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN114798770A CN114798770A (en) | 2022-07-29 |
| CN114798770B true CN114798770B (en) | 2023-05-09 |
Family
ID=82527551
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210149615.5A Active CN114798770B (en) | 2022-02-18 | 2022-02-18 | High-altitude aluminum foil and preparation method and application thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN114798770B (en) |
Citations (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2011110605A (en) * | 2009-11-30 | 2011-06-09 | Showa Seiko Kk | Roll forming apparatus of porous metal foil |
| CN103228254A (en) * | 2010-12-09 | 2013-07-31 | 高露洁-棕榄公司 | Liquid cleaning composition containing long-hain fatty acid |
| JP2013211127A (en) * | 2012-03-30 | 2013-10-10 | Mitsubishi Alum Co Ltd | Aluminium foil for lithium ion secondary battery positive electrode collector and method of manufacturing the same |
| CN104512098A (en) * | 2014-11-28 | 2015-04-15 | 苏州欧博时装有限公司 | Printing machine used for ventilating and cooling T-shirt fabric |
| CN104512102A (en) * | 2014-11-28 | 2015-04-15 | 苏州欧博时装有限公司 | Printing machine with ultrasonic aluminum foil cleaning device for printing cotton |
| CN204322733U (en) * | 2014-11-28 | 2015-05-13 | 苏州欧博时装有限公司 | With the cotton printing printing machine of ultrasonic wave aluminium foil cleaning device |
| CN109663728A (en) * | 2018-12-14 | 2019-04-23 | 江西明冠锂膜技术有限公司 | A kind of lithium battery encapsulation aluminum plastic film aluminium foil passivation technology |
| CN110370780A (en) * | 2019-06-28 | 2019-10-25 | 佛山佛塑科技集团股份有限公司 | The preparation method of flexible packaging film |
| CN111438187A (en) * | 2020-04-03 | 2020-07-24 | 江苏大亚铝业有限公司 | Production process for preparing aluminum foil for lithium battery by high-hardness roller |
| CN112387782A (en) * | 2020-10-29 | 2021-02-23 | 厦门厦顺铝箔有限公司 | Production method of aluminum foil for high-adhesion lithium ion battery |
| CN113714287A (en) * | 2020-12-31 | 2021-11-30 | 杭州五星铝业有限公司 | Production process of aluminum foil for Dada double-sided photocell |
-
2022
- 2022-02-18 CN CN202210149615.5A patent/CN114798770B/en active Active
Patent Citations (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2011110605A (en) * | 2009-11-30 | 2011-06-09 | Showa Seiko Kk | Roll forming apparatus of porous metal foil |
| CN103228254A (en) * | 2010-12-09 | 2013-07-31 | 高露洁-棕榄公司 | Liquid cleaning composition containing long-hain fatty acid |
| JP2013211127A (en) * | 2012-03-30 | 2013-10-10 | Mitsubishi Alum Co Ltd | Aluminium foil for lithium ion secondary battery positive electrode collector and method of manufacturing the same |
| CN104512098A (en) * | 2014-11-28 | 2015-04-15 | 苏州欧博时装有限公司 | Printing machine used for ventilating and cooling T-shirt fabric |
| CN104512102A (en) * | 2014-11-28 | 2015-04-15 | 苏州欧博时装有限公司 | Printing machine with ultrasonic aluminum foil cleaning device for printing cotton |
| CN204322733U (en) * | 2014-11-28 | 2015-05-13 | 苏州欧博时装有限公司 | With the cotton printing printing machine of ultrasonic wave aluminium foil cleaning device |
| CN109663728A (en) * | 2018-12-14 | 2019-04-23 | 江西明冠锂膜技术有限公司 | A kind of lithium battery encapsulation aluminum plastic film aluminium foil passivation technology |
| CN110370780A (en) * | 2019-06-28 | 2019-10-25 | 佛山佛塑科技集团股份有限公司 | The preparation method of flexible packaging film |
| CN111438187A (en) * | 2020-04-03 | 2020-07-24 | 江苏大亚铝业有限公司 | Production process for preparing aluminum foil for lithium battery by high-hardness roller |
| CN112387782A (en) * | 2020-10-29 | 2021-02-23 | 厦门厦顺铝箔有限公司 | Production method of aluminum foil for high-adhesion lithium ion battery |
| CN113714287A (en) * | 2020-12-31 | 2021-11-30 | 杭州五星铝业有限公司 | Production process of aluminum foil for Dada double-sided photocell |
Also Published As
| Publication number | Publication date |
|---|---|
| CN114798770A (en) | 2022-07-29 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| EP2822068B1 (en) | Aluminum foil for collectors and method for producing same | |
| CN113458143B (en) | Method for preparing aluminum electrolytic capacitor anode foil by using cold rolling mill | |
| CN113714287A (en) | Production process of aluminum foil for Dada double-sided photocell | |
| CN111082004A (en) | Preparation method of lithium-copper composite foil | |
| WO2023169022A1 (en) | Method for processing and recycling ultrathin lithium foil, and product | |
| WO2020258842A1 (en) | Ultra-thin lithium film preform and preparation method therefor | |
| CN115188597A (en) | Preparation method of sintered anode material based on multi-particle size matching | |
| CN114798770B (en) | High-altitude aluminum foil and preparation method and application thereof | |
| CN113381001B (en) | Lithium roll film for supplementing lithium to negative plate and application | |
| CN117275956B (en) | Processing method of super capacitor current collector aluminum foil and product thereof | |
| CN112332027A (en) | Lithium battery diaphragm slurry, diaphragm and lithium battery | |
| WO2020090195A1 (en) | Rolled copper foil for lithium ion battery current collector, and lithium ion battery | |
| WO2023184879A1 (en) | Current collector etched foil and preparation method therefor, electrode, and lithium battery | |
| CN116364350B (en) | Preparation method of oleophylic aqueous conductive paste for battery aluminum foil | |
| CN112840422B (en) | Method for producing electrode material for aluminum electrolytic capacitor | |
| CN113690409A (en) | Pole piece processing method for improving battery performance | |
| CN114899409B (en) | Preparation method of carbon nano tube fiber current collector | |
| CN110661004A (en) | Method for removing oxidation film of lithium battery aluminum foil | |
| CN116178782B (en) | Preparation method of high-filler ultrathin polytetrafluoroethylene-based composite medium substrate | |
| CN116435521A (en) | Carbon-coated aluminum foil for preparing high-energy-density lithium ion battery and preparation method thereof | |
| CN115341171A (en) | Magnetron sputtering coating method, metalized plastic film and application thereof | |
| CN210826320U (en) | Vacuum winding coating film raw film pretreatment device | |
| CN110970629B (en) | Fuel cell membrane electrode CCM and preparation method and device thereof | |
| CN116851443A (en) | Battery aluminum foil and preparation method thereof | |
| CN216006045U (en) | Cathode roller, electrolytic copper foil mechanism and preparation system of finished copper foil |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |