CN114798770A - High dyne aluminum foil and preparation method and application thereof - Google Patents
High dyne aluminum foil and preparation method and application thereof Download PDFInfo
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- CN114798770A CN114798770A CN202210149615.5A CN202210149615A CN114798770A CN 114798770 A CN114798770 A CN 114798770A CN 202210149615 A CN202210149615 A CN 202210149615A CN 114798770 A CN114798770 A CN 114798770A
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- 229910052782 aluminium Inorganic materials 0.000 title claims abstract description 161
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 title claims abstract description 161
- 239000011888 foil Substances 0.000 title claims abstract description 161
- 238000002360 preparation method Methods 0.000 title claims description 9
- 238000004140 cleaning Methods 0.000 claims abstract description 65
- 238000000034 method Methods 0.000 claims abstract description 41
- 238000004519 manufacturing process Methods 0.000 claims abstract description 21
- 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
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 28
- 229910052799 carbon Inorganic materials 0.000 claims description 28
- 238000005096 rolling process Methods 0.000 claims description 28
- 238000000576 coating method Methods 0.000 claims description 26
- 239000011248 coating agent Substances 0.000 claims description 23
- 238000001035 drying Methods 0.000 claims description 18
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 17
- 239000002002 slurry Substances 0.000 claims description 14
- RTZKZFJDLAIYFH-UHFFFAOYSA-N Diethyl ether Chemical compound CCOCC RTZKZFJDLAIYFH-UHFFFAOYSA-N 0.000 claims description 6
- 239000000463 material Substances 0.000 claims description 6
- 238000003756 stirring Methods 0.000 claims description 6
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims description 4
- 230000009467 reduction Effects 0.000 claims description 4
- KWIUHFFTVRNATP-UHFFFAOYSA-N Betaine Natural products C[N+](C)(C)CC([O-])=O KWIUHFFTVRNATP-UHFFFAOYSA-N 0.000 claims description 3
- KWIUHFFTVRNATP-UHFFFAOYSA-O N,N,N-trimethylglycinium Chemical compound C[N+](C)(C)CC(O)=O KWIUHFFTVRNATP-UHFFFAOYSA-O 0.000 claims description 3
- 229960003237 betaine Drugs 0.000 claims description 3
- 239000012530 fluid Substances 0.000 claims description 3
- 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
- 102000013035 dynein heavy chain Human genes 0.000 claims description 2
- 108060002430 dynein heavy chain Proteins 0.000 claims description 2
- 238000004804 winding Methods 0.000 claims 1
- 230000001976 improved effect Effects 0.000 abstract description 17
- 230000008569 process Effects 0.000 abstract description 15
- 230000000694 effects Effects 0.000 abstract description 11
- 239000007788 liquid Substances 0.000 abstract description 9
- 239000000853 adhesive Substances 0.000 abstract description 3
- 230000001070 adhesive effect Effects 0.000 abstract description 3
- 230000008859 change Effects 0.000 abstract description 2
- 230000007613 environmental effect Effects 0.000 abstract description 2
- 231100000957 no side effect Toxicity 0.000 abstract description 2
- 239000003921 oil Substances 0.000 description 15
- 238000005406 washing Methods 0.000 description 14
- 230000007547 defect Effects 0.000 description 9
- 238000009736 wetting Methods 0.000 description 9
- 238000005516 engineering process Methods 0.000 description 8
- 230000000052 comparative effect Effects 0.000 description 6
- 238000000137 annealing 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
- 238000007599 discharging Methods 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
- 229910052744 lithium Inorganic materials 0.000 description 3
- 238000010926 purge Methods 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- 238000004381 surface treatment Methods 0.000 description 3
- 238000012360 testing method Methods 0.000 description 3
- 125000004429 atom Chemical group 0.000 description 2
- 239000002585 base Substances 0.000 description 2
- 238000006243 chemical reaction Methods 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
- 239000006185 dispersion Substances 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 239000002904 solvent Substances 0.000 description 2
- 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
- 230000033228 biological regulation Effects 0.000 description 1
- 238000007664 blowing Methods 0.000 description 1
- 239000006229 carbon black Substances 0.000 description 1
- 239000000084 colloidal system Substances 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000005238 degreasing Methods 0.000 description 1
- 230000008021 deposition Effects 0.000 description 1
- 239000003995 emulsifying agent Substances 0.000 description 1
- 239000003344 environmental pollutant 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
- 230000006872 improvement Effects 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 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
- 231100000719 pollutant Toxicity 0.000 description 1
- 230000000379 polymerizing effect 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
- 230000001131 transforming effect Effects 0.000 description 1
- 238000002834 transmittance Methods 0.000 description 1
- 230000037303 wrinkles Effects 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 method for preparing a high dyne aluminum foil, which comprises the step of carrying out micro-concave cleaning on an aluminum foil by adding a cleaning solution into a trough of a micro-concave roller, so that the dyne value of the aluminum foil is greatly improved, the dyne value is increased from the original 30dyn to 60dyn, and the technical blank of the high dyne aluminum foil is filled; and the micro-concave roller is used for cleaning, so that the production rate is greatly improved. The method of the invention uses less cleaning liquid, and the amount of the cleaning liquid is accurately controlled by adjusting the mesh number of the micro-concave roller. The method has the advantages of obvious deoiling effect, no harmful gas generation during the use process, 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, keeps the dyne value of the obtained aluminum foil stable, and basically does not generate attenuation change in the production process. Further ensuring the application of the obtained aluminum foil in the lithium ion battery.
Description
Technical Field
The invention belongs to the technical field of aluminum foil processing, and relates to a high dyne aluminum foil and a preparation method and application thereof.
Background
Due to the rapid development of new energy vehicles in the world, the demand for lithium batteries is increasingly vigorous, and meanwhile, the demand for aluminum foils of the batteries is rapidly pulled. Data show that the aluminum foil yield in China is in a stable growth trend in 2016 + 2020, and the growth speed is 4% -5% generally. In 2020, the yield of the aluminum foil in China is 415 ten thousand tons, and the yield is increased by 3.75 percent on a par. According to the disclosure of China association of nonferrous metals processing industry on China forum for the development peak of aluminum foil industry, the production yield of aluminum foil 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 multiplying power performance; the dynamic resistance during charging and discharging is improved, the pressure difference consistency 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 base material is improved, and the easy coating performance of the base material is enhanced. However, with the rapid rise of the lithium battery industry, the quality requirements of aluminum foils for batteries, including carbon-coated aluminum foils, are higher, and the dyne value requirements of the aluminum foils for batteries are also higher.
The traditional production technology process of the aluminum foil for the Dada battery and the technical process defects thereof are as follows:
1. annealing process: the traditional method for improving the surface wetting tension of the single-light aluminum foil is mainly to carry out annealing treatment, and discharge rolling oil on the surface of the aluminum foil through long-time high temperature, so that the surface of the aluminum foil is free of oil, and the surface wetting tension of the aluminum foil can be improved to a certain degree. However, the product is a battery foil product, is required to be in a hard state (H18 state), and the tensile strength cannot meet the requirement after long-time high-temperature annealing; and because the aluminum foil is a product with double-sided light, the porosity between the aluminum foil layers is very small (less than 5 percent), oil films cannot be effectively removed, and the process cannot be applied. In summary, using an annealing process reduces the tensile strength of the aluminum foil, the elongation of the aluminum foil, and the degreasing is insufficient.
2. Surface purging: and a duckbill sector purging device is installed on the rolling outlet side, and the aluminum foil soaked in the rolling oil is purged under high pressure to purge the rolling oil on the surface. The surface of the aluminum foil after being blown has no obvious oil spots. However, in the case of a double-beam aluminum foil having a thickness of 15 μm or less, since a roll gap remains, it is impossible to sufficiently remove oil stains on the surface, and the surface of the rolled aluminum foil has oil in various degrees. In summary, the defects of using surface blowing are that the application range is small, the effect on the aluminum foil with the thickness less than or equal to 15 μm is poor, and the oil removal is insufficient
3. Slitting surface treatment: when the aluminum foil is cut and processed, high-temperature discharge is adopted to process the aluminum foil, an oil film on the surface of the aluminum foil is broken up instantly, functional groups broken up by the charge level can be effectively prevented from polymerizing by ozone generated by high-voltage discharge, and meanwhile, oil gas subjected to surface treatment can be sucked away by the discharge negative pressure end, so that surface residual oil is reduced, and the dyne value is improved. When the aluminum foil is cut and processed, the rewinding speed is less than or equal to 100m/min, the distance between the discharging rewinding equipment and the surface of the aluminum foil is less than or equal to 2mm, the power of the discharging rewinding equipment is 10-15 KW, and the number of the processed aluminum foils is 6. The technical defect is 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 conclusion, the main defects of the use of the surface treatment of the cutting are that the promotion of the dyne of the aluminum foil for the battery is small, and the effect is not obvious
4. Acid washing, alkali washing and water washing processes: in the production link of air-conditioning foil or embossed oxidation plate (thickness is more than or equal to 0.2mm), the surface of the aluminum plate is cleaned by using the processes of acid washing, alkali washing and water washing to remove the oil film on the surface, and then the aluminum plate enters a long oven, and the liquid on the surface is removed at high temperature in the oven. The surface of the aluminum plate is rapidly oxidized into aluminum oxide, and the wetting tension of the surface is improved. However, the process is only useful for aluminum plates and is not applicable to products of aluminum foil (thickness less than or equal to 15 μm). The foil is thin and can deform when passing through liquid, so that wrinkles are caused. In addition, the cleaning speed is slow (generally only 5-10 m/min), and the requirement of mass production cannot be met at all. In conclusion, the processes of acid washing, alkali washing and water washing have the defects of small application range and inapplicability to products with the thickness of the aluminum foil being 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 a carbon-coated aluminum foil (a product with high added value), slurry plays an indispensable or deficient role (I adopts water-based slurry), the slurry is placed in a stirring barrel, a motor is started, a shaft with blades is inserted into the coating to rotate after frequency conversion and speed regulation, so that the coating is in an annular rolling mode, a vortex is formed in the middle, the stirring is continued, slurry agglomerates are scattered, the mechanical dispersion process of deposition and precipitation is avoided, and the smoothness and uniformity of the slurry are directly influenced by the quality of the dispersion.
6. Surface baking: on aluminum foil for carbon coating (a product with high added value), when the extremely thin carbon black coated on the surface can not be attached, the aluminum foil is put into an oven for baking, and the baking method comprises the following steps: the aluminum foil is spread and passes through a roller system of an oven (the length of the oven is about 40 meters), the temperature is raised to 120 ℃, and the tape moving speed is controlled to be about 20 m/min. The surface wetting tension can be increased from 30dyn to 31 dyn. However, this process has some problems: firstly, the speed is slow, and the requirement of mass production cannot be met; the second is that the roller system is many, easily leads to the pockmark (concave-convex point), and the probability that the outward appearance is unqualified increases, and the third is that the roller system is many, easily corrugates. In conclusion, the surface baking is used, the speed of producing the aluminum foil is low, the productivity is reduced, and defective products with the defects of concave and convex points and the like on the surface of the aluminum foil are easy to appear due to the fact that more roller systems are needed in the technical industrial process.
7. Coating an aluminum foil: the coating method of single-station unreeling → feeding traction → front coating → horizontal drying box → rectifying → cooling traction → back coating → horizontal drying box → rectifying → discharging traction → double-station reeling is adopted. The continuous coating of 1 front coating +1 back continuous coating/longitudinal multi-strip blank or transverse gap blank (automatic overprinting) is completed at one time. The alignment 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 surface of the coated aluminum foil has different degrees of missing coating.
In the field of battery foils, the dyne value is generally divided into three intervals: (ii) less than 30dyn is a low dyne value; the dyne value is 30-31 dyn and belongs to a conventional dyne value; and the dyne value more than or equal to 32dyn belongs to a high dyne interval. At present, the industry is in a blank stage in the aspect of effectively producing aluminum foils for batteries in a high dyne interval, so that the search for obtaining 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 objectives of the present invention is to provide a method for preparing a dyne aluminum foil, wherein the dyne value of the aluminum foil obtained by the method is increased to 60dyn, the production speed is high, and the application range is wide.
The second purpose of the present invention is to provide a dyne aluminum foil.
The invention also aims to provide the application of the high dyne aluminum foil in the lithium ion battery.
One of the purposes of the invention is realized by adopting the following technical scheme:
a preparation method of a dyne aluminum foil comprises the following steps:
(1) carrying out rough rolling, medium rolling and finish rolling on the aluminum foil material to obtain an 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 fluid into a trough of the micro-concave roller;
(4) and (4) rolling and packaging the aluminum foil obtained in the step (3).
Further, the aluminum foil is a double-sided polished aluminum foil, a single-sided polished aluminum foil or a 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 the carbon-coated slurry, supplying the carbon-coated slurry to a trough of a micro-concave roller, and then coating and drying the front side and the back side of the aluminum foil after micro-concave cleaning and drying.
Further, the cleaning solution for cleaning the dimple in the step (3) comprises 10-15 parts of diethylbenzylamine, 1-3 parts of polyvinylpyrrolidone, 4-7 parts of lauric betaine, 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 180 m/min; the drying temperature is 60-80 deg.C, and the drying time is 40-90 s.
Furthermore, the rolling reduction and the finish rolling reduction in the step (1) are respectively 35-45% and 30-50%.
Further, the slitting speed in the step (2) is less than or equal to 300 m/min.
Further, the rolling speed in the step (4) is less than or equal to 100 m/min.
The second purpose of the invention is realized by adopting the following technical scheme:
a dynein aluminum foil prepared by the method.
The third purpose of the invention is realized by adopting the following technical scheme:
the application of the high dyne aluminum foil in the preparation of the lithium ion battery is provided.
Compared with the prior art, the invention has the beneficial effects that:
compared with the prior art, the method has the advantages that the cleaning liquid is additionally arranged in the trough of the micro-concave roller to carry out micro-concave cleaning on the aluminum foil, so that the dyne value of the aluminum foil is greatly improved, the dyne value is increased from the original 30dyn to 60dyn, and the technical blank 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 a small amount of cleaning fluid, and the surface of the aluminum foil is covered by about 0.05g/m 2 The improvement effect can be achieved. And the amount of the cleaning solution can be accurately controlled by adjusting the mesh number of the micro-concave roller. The method has obvious deoiling effect, is suitable for a density gradient centrifugation method because the density of the cleaning solution is less than that of residual rolling oil on the surface of the aluminum foil, and further improves the deoiling effect. No harmful gas is generated in the using process, and the method 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, keeps the dyne value of the obtained aluminum foil stable, and basically does not generate attenuation change in the production processAnd (4) transforming. Further ensuring the application of the obtained aluminum foil in the lithium ion battery.
Drawings
FIG. 1 is a schematic view of a coated micro-gravure roll of the present invention, wherein FIG. A is a blank control and FIG. B is a schematic view after a cleaning solution is added.
Detailed Description
The present invention will be further described with reference to the accompanying drawings and the detailed description, and it should be noted that any combination of the embodiments or technical features described below can be used to form a new embodiment without conflict.
Example 1
A preparation method of a dyne aluminum foil comprises the following steps:
(1) and carrying out rough rolling, medium rolling and finish rolling on the aluminum foil material to obtain the 0.015mm aluminum foil. Wherein the aluminum foil material comprises 0.25 percent of Fe, 0.05 percent of Si, 0.04 percent of Cu, 0.02 percent of Ti, 0.08 percent of Mn, 0.03 percent of Mg, 0.031 percent of Ti and the balance of Al by mass percent. The indexes of the oil products of the medium rolling and the finish rolling can ensure the initial wetting tension of the obtained aluminum foil, and the main indexes are shown in the table 1:
| each index | Medium rolling | Finish rolling |
| Viscosity target value (mm) 2 /s) | 1.7-2.05 | 1.8-2.1 |
| Light 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 medium and finish rolling are shown in table 2:
TABLE 2
| Each index | Medium rolling | Finish rolling |
| Roller diameter (mm) | 270-280 | 270-280 |
| Convexity (mm) | 60‰ | 80‰ |
| Roughness (μm) | 0.3-0.15 | 0.12-0.14 |
| Reduction of | 35％-45％ | 30％-50％ |
(2) And (2) slitting the aluminum foil obtained in the step (1), wherein the aluminum foil is recycled to a slitting process within 6 hours after rolling is finished, and the slitting speed is less than or equal to 300 m/min.
(3) Carrying out micro-concave cleaning and drying on the aluminum foil cut in the step (2), and filling a cleaning solution into a trough of a micro-concave roller (as shown in figure 1), wherein the coating amount of the cleaning solution is 0.05g/cm 2 The washing rate was 180 m/min. And (4) cleaning the baked aluminum foil by using a carbon coating machine, and replacing carbon coating slurry on the carbon coating machine with cleaning liquid. When the carbon coating machine performs rewinding, the micro concave roller is completely immersed in the cleaning solution, the concave part of the micro concave roller is filled with the cleaning solution, the aluminum foil directly contacts with the micro concave roller through the roller of the carbon coating machine and the cleaning solution is transferred to the aluminum foil, the cleaning solution is transferred to the finished aluminum foil and immediately sent into an oven, and the solvent of the cleaning solution is volatilized through a drying device to be dried. The drying temperature is 60-80 deg.C, and the drying time is 40-90 s.
The cleaning solution comprises 2 parts of polyvinylpyrrolidone, 11 parts of diethylbenzylamine, 5 parts of lauric betaine, 3 parts of penetrant isomeric alcohol ether, 6 parts of emulsifier polyacrylate and 150 parts of water.
(4) And (4) rolling and packaging the aluminum foil obtained in the step (3), wherein the rolling speed is less than or equal to 100m/min, and thus the dyne aluminum foil is obtained.
Example 2
A preparation method of a dyne aluminum foil comprises 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 system carbon-coated slurry, supplying the water system carbon-coated slurry to the trough of the micro-concave roller through a feeding pump, and then coating and drying the front side and the back side of the aluminum foil.
Otherwise, the same procedure as in example 1 was repeated to obtain a dyne-coated aluminum foil.
Comparative example 1
Comparative example 1 differs from example 1 in that: and (4) adjusting the micro concave roller matched with the cleaning solution in the step (3) to be a common smooth roller matched with the cleaning solution, and the rest is the same as the embodiment 1.
Comparative example 2
Comparative example 2 differs from example 1 in that: the cleaning solution in step (3) was adjusted to a commercially available cleaning solution (model SX705), and the rest was the same as in example 1.
The dyne value detection adopts the standard dyne liquid contrast detection, and the surface wetting tension of the aluminum foil rolled in the example 1 and the carbon-coated aluminum foil rolled in the example 2 is detected to be not less than 60 dyne value at most. The difference between comparative example 1 and example 1 is that a plain smooth roll was used instead of a slightly concave roll, and the surface wetting tension of the obtained aluminum foil was at most 33 dyne. Comparative example 2 differs from example 1 in that a commercially available cleaning solution is substituted for the cleaning solution of the present invention, and the surface wetting tension of the aluminum foil obtained is up to 30 dyne. Therefore, the aluminum foil is cleaned by adopting the method of matching the micro-concave roller with the cleaning solution, and the surface wetting tension of the aluminum foil can be effectively improved.
The cleaning solution disclosed by the invention is used for removing oil stains by utilizing chemical superposition synergism, and through a large amount of experimental data, the most appropriate ratio of the oil removal effect of the cleaning solution to the aluminum foil dyne lifting effect is obtained after the cleaning solution is used, and the density of the originally created cleaning solution after the ratio is smaller than that of residual rolling oil on the surface of the aluminum foil for the battery, so that a density gradient centrifugation method (a substance separation method) is applied, and the oil removal effect is further improved. And the carbon coating slurry used in the carbon coating process of producing the lithium battery on the market is basically water system slurry, so that the water system carbon coating slurry and the cleaning solution have hydrogen atoms forming strong polar bonds with atoms with large electronegativity and atoms with smaller radius, larger electronegativity, lone pair electrons and partial negative charges, so that hydrogen bonds stronger than Van der Waals force are easily formed, and the binding force of the water system slurry and the aluminum foil is enhanced in the carbon coating process of the aluminum foil for the battery.
The cleaning solution is placed in a trough of the micro-concave roller to carry out the micro-concave cleaning step on the aluminum foil, when a carbon coating machine carries out rewinding, the micro-concave roller is completely immersed in the original cleaning solution, the concave part of the micro-concave roller is filled with the cleaning solution, the aluminum foil is directly contacted with the micro-concave roller through a roller of the carbon coating machine and the cleaning solution is transferred to the aluminum foil, the aluminum foil after the cleaning solution is transferred to the aluminum foil is immediately sent into an oven, and the solvent of the cleaning solution is volatilized through a drying device to be dried.
Through a large amount of experimental data, the dyne value of the aluminum foil for the battery can be obviously improved only by trace of cleaning solution, and the data shows that the coverage of the surface of the aluminum foil is about 0.05g/m 2 An improved effect can be achieved and peaks as the amount of surface coverage increases to a certain value. And because the amount of the cleaning solution can be accurately and correctly controlled by adjusting the mesh number of the micro-concave roller, the required target dyne value can be reached by accurately controlling the amount of the cleaning solution. Compared with the traditional technologies such as the dosage and the effect of acid washing, alkali washing and water washing technologies, the high efficiency and the controllability of the new technology are obviously highlighted.
Through the test tracking of the technology, no pollutant is generated in the production process, and when the cleaning solution (the cleaning solution contains 80-90% of water) is baked and dried in an oven, the volatile gas is water vapor, and no other harmful pollution gas is generated.
The aluminum foil for battery is generally improved by the conventional techniques while the properties of the aluminum foil in other aspects are affected, for example, the tensile strength and elongation of the aluminum foil for battery are reduced to different degrees by the annealing process. By testing the aluminum foil produced using the present technique, the data shows that the mechanical properties of the aluminum foil are unchanged.
Generally, after the aluminum foil dyne for the battery is lifted by the traditional technology, the aluminum foil dyne can quickly drop along with the lapse of time, and the reason for the drop is generally considered that the aluminum foil surface is in contact with air water molecules, so that the aluminum foil dyne drops. The residual of the cleaning solution on the surface of the aluminum foil produced by the new technology is high enough to isolate the aluminum foil from the air water molecules to generate certain chemical or physical reaction, so that the aluminum foil dyne value is basically kept stable and unchanged after long-time testing, and no obvious decline trend appears.
In conclusion, the invention overcomes the defects of low aluminum foil dyne value, insufficient aluminum foil deoiling, low aluminum foil production speed and low productivity in the traditional technology, and greatly reduces the probability of defective products such as concave-convex points of the surface quality of the aluminum foil and the like caused by more roller systems in the production process; the appearance of the coating of the anode slurry or the carbon coating slurry in the production process of the lithium ion battery is greatly improved, and the coating is uniform, fine and smooth and has strong adhesion. Provides a good foundation for the subsequent application in the lithium ion battery.
The above embodiments are only preferred embodiments of the present invention, and the scope of protection of the present invention should not be limited thereby, and any insubstantial changes and substitutions made by those skilled in the art based on the present invention are within the scope of protection of the present invention.
Claims (10)
1. A preparation method of a dyne aluminum foil is characterized by comprising the following steps:
(1) carrying out rough rolling, medium rolling and finish rolling on the aluminum foil material to obtain an 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 fluid into a trough of the micro-concave roller;
(4) and (4) rolling and packaging the aluminum foil obtained in the step (3).
2. The method of claim 1, wherein the aluminum foil is a double-sided polished aluminum foil, a single-sided polished aluminum foil, or a carbon-coated aluminum foil.
3. The method of claim 1, wherein the aluminum foil is a carbon-coated aluminum foil, further comprising the steps of feeding the carbon-coated slurry to a trough of a dimple roller after stirring and dispersing the carbon-coated slurry, and then coating and drying the cleaned and dried aluminum foil on the front and back sides.
4. The method for preparing the dyne aluminum foil as claimed in claim 1, wherein the cleaning solution for cleaning the dimple in the step (3) comprises 10-15 parts of diethylbenzylamine, 1-3 parts of polyvinylpyrrolidone, 4-7 parts of lauric betaine, 2-5 parts of isomeric alcohol ether, 5-11 parts of polyacrylate and 100-200 parts of water.
5. The method of manufacturing the dyne aluminum foil of claim 1, wherein the cleaning rate in the step (3) is 180 m/min; the drying temperature is 60-80 deg.C, and the drying time is 40-90 s.
6. The method of manufacturing the dyne aluminum foil of claim 1, wherein the reduction amounts of the rolling and the finish rolling in the step (1) are 35% to 45% and 30% to 50%, respectively.
7. The method for preparing the dyne aluminum foil as claimed in claim 1, wherein the slitting speed in the step (2) is less than or equal to 300 m/min.
8. The method of claim 1, wherein the winding rate in step (4) is not more than 100 m/min.
9. A dyne aluminum foil produced by the method of any one of claims 1 to 8.
10. Use of the dynein aluminum foil of claim 9 in the preparation of a lithium ion battery.
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