CN114277286B - High-tensile-strength and high-extensibility aluminum foil for power lithium battery and preparation method thereof - Google Patents
High-tensile-strength and high-extensibility aluminum foil for power lithium battery and preparation method thereof Download PDFInfo
- Publication number
- CN114277286B CN114277286B CN202111643440.5A CN202111643440A CN114277286B CN 114277286 B CN114277286 B CN 114277286B CN 202111643440 A CN202111643440 A CN 202111643440A CN 114277286 B CN114277286 B CN 114277286B
- Authority
- CN
- China
- Prior art keywords
- rolling
- aluminum foil
- lithium battery
- temperature
- casting
- 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
Classifications
-
- 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 discloses a high-tensile high-extensibility aluminum foil for a power lithium battery and a preparation method thereof, wherein the aluminum foil mainly comprises the following components in percentage by weight: si: 0.01-0.25%; fe: 0.08-0.4%; cu: 0.01-0.05%; 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 balance of Al. The preparation process comprises smelting, casting and rolling, cold rolling and foil rolling, and the invention mainly solves the problem of strip breakage easily caused by insufficient strength and ductility in the electrode manufacturing process of the conventional aluminum foil, thereby improving the ductility of the aluminum foil for the lithium battery. The tensile strength of the aluminum foil prepared by the preparation process is more than or equal to 220MPa, the elongation is more than 5.0 percent, and the tensile strength and the ductility of the aluminum foil for the power lithium battery are greatly improved.
Description
Technical Field
The invention relates to a high-tensile high-extensibility aluminum foil for a power lithium battery and a preparation method thereof.
Background
The rapid development of the power lithium battery industry brings about further development of the aluminum foil industry for the power lithium battery.
The power lithium battery has the advantages of high energy density, high working power, light weight, small volume, small self-discharge, no memory effect, multiple cycle times and the like, and is replacing the traditional lead-acid storage battery step by step. In combination with the above market demands, higher and higher requirements are being put forward for aluminum foils for lithium batteries.
Aluminum foils for lithium batteries are used as current collectors of lithium batteries, and during a flattening process such as roll rolling of electrodes coated with active materials such as graphite, the aluminum foils for lithium batteries need to be deformed enough to adapt to the surface characteristics of the active materials to prevent deterioration of contact performance between the aluminum foils and the active materials.
When the tensile strength is low, the electrode coated with the active material is likely to be broken during the flattening process such as roll rolling. Meanwhile, enough elongation is needed, if the elongation is low, when the electrode coated with the active substance is subjected to a flattening process such as roll calendering, the aluminum foil for the power functional material generates internal stress and is split, so that the performance of the battery capacity, the cycle life and the like is directly influenced.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provides a high-tensile high-extensibility aluminum foil for a power lithium battery and a preparation method thereof.
The aluminum foil with high tensile strength and high extensibility for the power lithium battery comprises the following components in percentage by weight:
Si：0.01～0.25%；
Fe：0.08～0.4%；
Cu：0.01～0.05%；
Mn：≤0.02%；
Zn：≤0.04%；
Ti：≤0.04%；
the balance of Al.
Further, the ratio of Zn to Ti is 1: 1.
A preparation method of a high-tensile high-extensibility aluminum foil for a power lithium battery comprises the following steps:
s1, smelting: heating and leveling the raw materials, and uniformly stirring, wherein the smelting temperature is 740 ℃ plus the temperature, and the converter-reversing temperature is 740 ℃ plus 760 ℃;
s2, casting and rolling: preparing an aluminum material with a certain thickness by casting and rolling;
s3, cold rolling: and roughly rolling the cast and rolled aluminum material to a preset thickness, wherein the preset thickness is 0.4-0.6 mm.
After the rough rolling is finished, performing intermediate annealing treatment, wherein the specific operation of the intermediate annealing is treatment for 27-35h at the temperature of 240-270 ℃, and after the intermediate annealing, rolling to 0.2-0.3mm and longitudinally shearing edges;
s4, foil rolling: rolling the steel plate to 0.013mm by multiple passes of rolling, wherein the parameters of each pass of working roll are as follows:
the previous pass is as follows: the roughness of the working roll is 0.25 μm, and the convexity is 50%;
and (3) later pass: the roughness of the working roll is 0.12 μm and the convexity is 80%.
Further, the concrete parameters in the casting and rolling stage are as follows:
the temperature of the front box is 694-704 ℃;
the casting and rolling speed is 850-1000 mm/min;
the casting and rolling area is 55-75 mm;
the surface temperature of the roller is less than or equal to 75 ℃.
Further, smelting specifically comprises:
adding a refining agent at 730 ℃, refining for 20min, heating to 740 ℃, and refining for 20 min;
after the composition adjustment, the furnace is turned over, and the furnace turning temperature is controlled at 750 ℃.
Furthermore, the refining agent is chlorine salt, and the hydrogen content in the melt is controlled to be less than or equal to 0.1 mL/100 gAl.
Further, the thickness of the aluminum coil after the casting and rolling is 7.0-8.0 mm.
Has the advantages that:
the invention limits the types and the contents of the components and carries out intermediate annealing after the rough rolling is finished, thereby avoiding the internal stress defect generated by rolling and effectively improving the uniformity of the alloy structure.
After the casting rolling, the intermediate annealing and the cold rolling, the dislocation density of the aluminum foil can be improved by matching with the subsequent pass rolling, when the crystal grains in the aluminum foil are in a semi-crystalline state, the alloy crystal grains of the aluminum foil can be better crushed and refined by the subsequent semi-crystalline annealing (240-270 ℃, 27-35 h) and the pass rolling, so that the tensile strength and the ductility of the aluminum foil under the extremely thin thickness can be improved, and the problems that the aluminum foil of the lithium battery is easy to crush and difficult to process are solved.
Detailed Description
For the purpose of enhancing understanding of the present invention, the present invention will be further described in detail with reference to the following examples, which are provided for illustration only and are not to be construed as limiting the scope of the present invention.
Example 1:
a high-strength and high-ductility 1060 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: 0.08%, Fe: 0.18%, Cu: 0.02%, Mn: 0.01%, Zn: 0.02%, Ti: 0.03 percent. The balance being 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 20% (aluminum plate coils with the same alloy components), 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 has the main effects that the aluminum liquid is sprayed into the special refining agent for refining when the aluminum liquid is smelted, the special refining agent reacts with impurities in the aluminum liquid and the like to combine into a new compound, and the new compound floats on the surface of the filtrate in the form of aluminum slag to remove the aluminum slag, so that the effect of purifying the molten aluminum solution quality is achieved.
(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 2.0m 3 H, 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 58mm, controlling the opening degree of a casting nozzle at 5.5mm, controlling the casting and rolling linear speed at 950mm/min, and preparing a casting and rolling finished product roll with the thickness of 7.0mm and the width of 1695 mm;
(3) cold rolling: and (3) roughly rolling the cast and rolled finished coil to 0.45mm, then carrying out intermediate annealing at the temperature of 257 ℃ for 35h, rolling to the thickness of 0.26 after intermediate annealing, and enabling the longitudinal shearing edge to be 1635mm wide.
(4) Foil rolling: 0.26mm, rolling with 0.25 μm roughness and 50% convexity working roller in foil mill for 0.105mm and 0.045mm, and rolling with 0.12 μm roughness and 80% convexity working roller in foil mill for 0.021mm and 0.013mm to obtain final product thickness, and controlling the other steps according to conventional rolling.
The tensile strength of the aluminum foil product for the lithium battery prepared by the embodiment is 226mpa through a performance test, the elongation is 5.8%, 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:
a high-strength and high-ductility 1060 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: 0.23%, Cu: 0.03%, Mn: 0.015%, Zn: 0.03%, Ti: 0.025 percent. The balance being Al.
Based on the component control, the aluminum foil for the lithium battery is prepared and obtained, and the preparation method of the aluminum foil is completely the same as the method in the embodiment I
The tensile strength of the aluminum foil product for the lithium battery prepared by the embodiment is 231mpa through a performance test, the elongation is 5.7%, 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:
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: 0.23%, Cu: 0.03%, Mn: 0.015%, Zn: 0.03%, Ti: 0.025 percent. The balance being Al. Based on the component control, the aluminum foil for the lithium battery is prepared, the annealing thickness in the preparation method is 2.0mm, and other processes are the same as those in the first embodiment.
The tensile strength of the aluminum foil product for the lithium battery prepared by the comparative example is 280mpa and the elongation is 2.5% through a performance test.
Comparative example 2:
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: 0.23%, Cu: 0.03%, Mn: 0.015%, Zn: 0.03%, Ti: 0.025 percent. The balance being Al. Based on the component control, the aluminum foil for the lithium battery is prepared and obtained, and the preparation method has the fire thickness of 2.0mm, the annealing temperature of homogenizing annealing of 420 ℃ and the annealing time of 27 hours; the other processes are the same as the first embodiment.
The tensile strength of the aluminum foil product for the lithium battery prepared by the comparative example is 198mpa and the elongation is 3.0 percent through a performance test.
Results of Performance test of examples 1 and 2 and comparative examples 1 and 2
| Tensile strength/Mpa | Elongation rate/%) | |
| Example 1 | 226 | 5.8 |
| Example 2 | 231 | 5.7 |
| Comparative example 1 | 180 | 2.5 |
| Comparative example 2 | 198 | 3.0 |
Compared with the aluminum foil product for the lithium battery obtained by the comparative example, the aluminum foil product for the lithium battery obtained by rolling production according to the examples 1 and 2 has the advantage that the ductility is improved on the premise that the tensile strength is obviously improved. In the embodiments 1 and 2, under the condition of the alloy composition, after the cast-rolled finished product is rough-rolled to the thickness of 0.4-0.6mm, intermediate annealing is performed, so that not only is the stress generated by rolling eliminated, but also the alloy phase distribution and the tissue uniformity are improved, through the intermediate annealing, the dislocation density of the aluminum foil is higher, the crystal grains are in a semi-crystalline state, and in the subsequent pass rolling process, the alloy crystal grains are better crushed and refined through rolling; the combination of intermediate semi-crystallization annealing and rolling ensures that alloy crystal grains are better crushed and refined, and the comprehensive properties of tensile strength and elongation are obviously improved.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (6)
1. The aluminum foil with high tensile strength and high extensibility for the power lithium battery is characterized by comprising the following components in percentage by weight:
Si：0.01～0.25%；
Fe：0.08～0.4%；
Cu：0.01～0.05%；
Mn：≤0.02%；
Zn：≤0.04%；
Ti：≤0.04%；
the balance of Al, wherein the ratio of Zn to Ti is 1: 1;
the aluminum foil is prepared by the following method: the method comprises the following steps:
s1, smelting: heating and leveling the raw materials, and uniformly stirring, wherein the smelting temperature is 740 ℃ plus the temperature, and the converter-reversing temperature is 740 ℃ plus 760 ℃;
s2, casting and rolling: preparing an aluminum material with a certain thickness by casting and rolling;
s3, cold rolling: roughly rolling the cast and rolled aluminum material to a preset thickness of 0.4-0.6mm, and carrying out intermediate annealing treatment, wherein the intermediate annealing comprises treatment at the temperature of 240-270 ℃ for 27-35h, and rolling the cast and rolled aluminum material to 0.2-0.3mm after intermediate annealing and then longitudinally shearing edges;
s4, foil rolling: rolling the steel plate to 0.013mm by multiple passes of rolling, wherein the parameters of each pass of working roll are as follows:
the previous pass is as follows: the roughness of the working roll is 0.25 μm, and the convexity is 50%;
and (3) later pass: the roughness of the working roll is 0.12 μm and the convexity is 80%.
2. The method for preparing the aluminum foil for the power lithium battery with high tensile strength and high extensibility as claimed in claim 1, comprising the steps of:
s1, smelting: heating and leveling the raw materials, and uniformly stirring, wherein the smelting temperature is 740 ℃ plus the temperature, and the converter-reversing temperature is 740 ℃ plus 760 ℃;
s2, casting and rolling: preparing an aluminum material with a certain thickness by casting and rolling;
s3, cold rolling: roughly rolling the cast and rolled aluminum material to a preset thickness of 0.4-0.6mm, and carrying out intermediate annealing treatment, wherein the intermediate annealing treatment comprises treatment at the temperature of 240-270 ℃ for 27-35h, and after the intermediate annealing, rolling the cast and rolled aluminum material to 0.2-0.3mm and longitudinally shearing edges;
s4, foil rolling: rolling the steel plate to 0.013mm by multiple passes of rolling, wherein the parameters of each pass of working roll are as follows:
the previous pass is as follows: the roughness of the working roll is 0.25 μm, and the convexity is 50%;
and (3) later pass: the roughness of the working roll is 0.12 μm and the convexity is 80%.
3. The preparation method of the aluminum foil for the power lithium battery with high tensile strength and high extensibility as claimed in claim 1, wherein the specific parameters in the casting and rolling stage are as follows:
the temperature of the front box is 694-704 ℃;
the casting and rolling speed is 850-1000 mm/min;
the casting and rolling area is 55-75 mm;
the surface temperature of the roller is less than or equal to 75 ℃.
4. The preparation method of the aluminum foil for the power lithium battery with high tensile strength and high extensibility as claimed in claim 1, wherein the smelting specifically comprises:
adding a refining agent at 730 ℃, refining for 20min, heating to 740 ℃, and refining for 20 min;
after the composition adjustment, the furnace is turned over, and the furnace turning temperature is controlled at 750 ℃.
5. The method as claimed in claim 4, wherein the refining agent is chloride salt, and the hydrogen content in the melt is controlled to be 0.1 mL/100gAl or less.
6. The method for preparing the aluminum foil for the power lithium battery with high tensile strength and high extensibility as claimed in claim 1, wherein the thickness of the aluminum coil after the completion of the casting and rolling is 7.0-8.0 mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111643440.5A CN114277286B (en) | 2021-12-29 | 2021-12-29 | High-tensile-strength and high-extensibility aluminum foil for power lithium battery and preparation method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111643440.5A CN114277286B (en) | 2021-12-29 | 2021-12-29 | High-tensile-strength and high-extensibility aluminum foil for power lithium battery and preparation method thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN114277286A CN114277286A (en) | 2022-04-05 |
| CN114277286B true CN114277286B (en) | 2022-08-02 |
Family
ID=80878255
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202111643440.5A Active CN114277286B (en) | 2021-12-29 | 2021-12-29 | High-tensile-strength and high-extensibility aluminum foil for power lithium battery and preparation method thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN114277286B (en) |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2011074433A (en) * | 2009-09-30 | 2011-04-14 | Nippon Foil Mfg Co Ltd | Aluminum alloy foil for lithium ion secondary battery, and method for producing the same |
| JP2013256700A (en) * | 2012-06-13 | 2013-12-26 | Uacj Corp | Aluminum alloy foil |
| CN104797725A (en) * | 2012-12-03 | 2015-07-22 | 株式会社Uacj | Aluminum-alloy foil |
| CN105063429A (en) * | 2015-07-15 | 2015-11-18 | 浙江中金铝业有限公司 | Method for preparing aluminum foil for lithium battery |
| CN107785532A (en) * | 2017-09-29 | 2018-03-09 | 梅丹妮 | Improve aluminium foil of battery safety and its preparation method and application |
-
2021
- 2021-12-29 CN CN202111643440.5A patent/CN114277286B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2011074433A (en) * | 2009-09-30 | 2011-04-14 | Nippon Foil Mfg Co Ltd | Aluminum alloy foil for lithium ion secondary battery, and method for producing the same |
| JP2013256700A (en) * | 2012-06-13 | 2013-12-26 | Uacj Corp | Aluminum alloy foil |
| CN104797725A (en) * | 2012-12-03 | 2015-07-22 | 株式会社Uacj | Aluminum-alloy foil |
| CN105063429A (en) * | 2015-07-15 | 2015-11-18 | 浙江中金铝业有限公司 | Method for preparing aluminum foil for lithium battery |
| CN107785532A (en) * | 2017-09-29 | 2018-03-09 | 梅丹妮 | Improve aluminium foil of battery safety and its preparation method and application |
Also Published As
| Publication number | Publication date |
|---|---|
| CN114277286A (en) | 2022-04-05 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN111793759B (en) | 1070 high-performance aluminum foil for lithium ion battery and preparation method thereof | |
| CN113564425A (en) | Aluminum foil for 1N00 lithium battery and preparation method thereof | |
| CN102234750B (en) | Production method of aluminum foil for lithium battery | |
| CN111254320B (en) | High-strength material for flexible connection of new energy power battery and manufacturing method thereof | |
| CN101719423B (en) | Aluminum foil for high-voltage electrolytic capacitor anodes and production method | |
| CN111893351B (en) | Aluminum foil for 1235D lithium battery and preparation method thereof | |
| CN111074110B (en) | Production method of aluminum and aluminum alloy plate strip for new energy power battery case | |
| CN101066576A (en) | Aluminium foil base material producing process | |
| CN109338131B (en) | Preparation method of aluminum strip material for new energy power battery tab | |
| CN101859648B (en) | Aluminium foil for high-voltage electrolytic capacitor anodes and production method | |
| CN112239825B (en) | Production method of aluminum foil for high-performance lithium ion battery | |
| CN104245980A (en) | Aluminum alloy foil for electrode charge collector, and method for producing same | |
| CN111270109A (en) | Method for producing 8021 aluminum alloy soft packaging foil for lithium battery by cast rolling method | |
| CN101789314B (en) | Aluminum foil for low-voltage electrolytic capacitor anode and production method thereof | |
| CN112281028A (en) | Aluminum foil for electrolytic capacitor and production method thereof | |
| CN113106534B (en) | Lead alloy electrode plate, preparation method and anode plate | |
| CN101792875B (en) | Aluminum foil and production method thereof | |
| CN101770871B (en) | Aluminum foil for capacitor anode and production method | |
| CN114277286B (en) | High-tensile-strength and high-extensibility aluminum foil for power lithium battery and preparation method thereof | |
| CN101789313B (en) | Aluminum foil for electrolytic capacitor anode and production method thereof | |
| JP2012038518A (en) | Aluminum alloy hard foil for battery collector | |
| CN115652115A (en) | Production process of high-elongation 1100 alloy battery aluminum foil | |
| CN114405999A (en) | Production process of high-elongation 1060 alloy battery aluminum foil | |
| CN113385536A (en) | Battery aluminum foil production method for improving surface dyne value | |
| CN115233045B (en) | Production process of aluminum foil for high-manganese ultrahigh-strength battery |
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 |