JP2013108146A - Aluminum alloy foil for current collector and method of manufacturing the same - Google Patents

Abstract

Provided is an aluminum alloy foil for a current collector that can improve alkali corrosion resistance and has sufficient strength as compared with the prior art.
SOLUTION: Chemical component is mass%, Si: 0.01% or more and 0.4% or less, Fe: 0.01% or more and 0.9% or less, Mg: 0.1% or more and less than 1.5% The balance is made of Al and inevitable impurities, the thickness is 20 μm or less, and the tensile strength is 190 MPa or more. The chemical component further contains one or more selected from Cu: 0.01% or more and 0.30% or less and Mn: 0.1% or more and less than 0.50% by mass. May be. Further, the chemical component is, in mass%, Ti: 0.01% or more and 0.10% or less, Cr: 0.01% or more and 0.40% or less, and Zr: 0.01% or more and 0.40% or less. You may further contain 1 type, or 2 or more types selected from the following.
[Selection figure] None

Description

  The present invention relates to an aluminum alloy foil for a current collector and a method for producing the same.

  Conventionally, aluminum alloy foil has been used in various fields. In recent years, aluminum alloy foil has been used as a current collector for electrodes in secondary batteries such as lithium ion batteries, electric double layer capacitors and the like from the viewpoint of being thin and conductive. For example, in Patent Document 1, a slurry containing a positive electrode active material is applied to the surface of an aluminum alloy foil as a current collector and dried, and then rolled to improve density and adhesion. An electrode (positive electrode) of a lithium ion battery is described.

  Examples of the aluminum alloy foil used for the current collector include 99.0% by weight or more of aluminum and 0.5% by weight or less of each of iron, copper, and silicon, as known in Patent Document 1 described above. An aluminum alloy foil for a current collector having a total content of copper and silicon of less than 1.0% by weight is known.

  Moreover, as aluminum alloy foil which has another chemical component, for example, in patent document 2, 0.1 mass% or more and 6 mass% or less manganese and 0.001 mass% or more and 0.02 mass% or less iron And 0.0005 mass% or more and 0.02 mass% or less of silicon, and 0.0001 mass% or more and 0.03 mass% or less of copper, and the balance containing aluminum and inevitable impurities is disclosed. Has been. Further, Patent Document 3 discloses that 93 mass% or more of aluminum, 0.1 mass% or more and 6 mass% or less of manganese, 0.00001 mass% or more and 0.001 mass% or less of iron, and 0.00001 mass%. An aluminum alloy foil containing copper in an amount of 0.03% to 0.03% by mass and zinc in an amount of 0.00001% to 0.001% by mass with the balance containing inevitable impurities is disclosed.

  Further, as the slurry applied to the aluminum alloy foil for the current collector, specifically, a positive electrode active material such as lithium cobaltate, a binder such as polyvinylidene fluoride, etc., such as 1-methyl-2-methylpyrrolidone (NMP) Those prepared by dispersing and mixing in the above solvent solvents are known. Recently, in order to reduce the cost by reducing the content of rare element and expensive cobalt, proposals have been made to use lithium-nickel composite oxide or the like as the positive electrode active material instead of lithium cobalt oxide. .

JP 11-162470 A Japanese Patent Laid-Open No. 2007-016308 JP 2009-57579 A

However, the prior art has problems in the following points.
That is, the solvent solvent contained in the slurry applied to the aluminum alloy foil for the current collector is often harmful. Therefore, a large exhaust system is necessary from the viewpoint of protecting the working environment and preventing air pollution. Therefore, in recent years, it has been studied to use an aqueous solvent instead of the solvent solvent.

  However, when nickel is contained in the active material such as a lithium-nickel composite oxide, the solvent becomes alkaline due to hydrolysis of nickel. When the nickel content contained in the active material increases, a strong alkaline solvent having a pH exceeding 10 may be obtained.

  When such a strong alkaline slurry is applied to an aluminum alloy foil, the aluminum alloy is an amphoteric metal, so that alkali corrosion proceeds in a short time. In particular, in the case of an aluminum alloy foil having a thickness of 20 μm or less, a through hole due to corrosion may occur. Further, the gas generated during alkali corrosion causes the coated surface of the slurry to undulate, leading to a reduction in current collection characteristics.

  In addition, the aluminum alloy foil for the current collector needs to have sufficient strength to function as a current collector. Furthermore, in order to meet the demand for gauge down, it is necessary to increase the strength more than before.

  The present invention has been made in view of such a background, and is intended to provide an aluminum alloy foil for a current collector that can improve the alkali corrosion resistance and has sufficient strength as compared with the prior art. It is.

  In one embodiment of the present invention, the chemical component is, by mass, Si: 0.01% to 0.4%, Fe: 0.01% to 0.9%, Mg: 0.1% to 1. An aluminum alloy foil for a current collector comprising less than 5%, the balance being Al and inevitable impurities, a thickness of 20 μm or less, and a tensile strength of 190 MPa or more. ).

  In another aspect of the present invention, the chemical component is mass%, Si: 0.01% to 0.4%, Fe: 0.01% to 0.9%, Mg: 0.1% to 1% Ingot containing less than 5%, the balance being Al and inevitable impurities, homogenized, hot-rolled, then cold-rolled in a range where the final cold-rolling ratio is 90% or more, thickness 20 μm It exists in the manufacturing method of the aluminum alloy foil for collectors characterized by the following (Claim 4).

  The said aluminum alloy foil for collectors has content of each element contained in a chemical component in the said specific range. Therefore, even if a slurry showing strong alkalinity is applied to the foil surface, alkali corrosion hardly proceeds. Moreover, even if the thickness is 20 μm or less, a through-hole due to alkali corrosion is unlikely to occur. Thus, according to the said aluminum alloy foil for collectors, alkali-corrosion resistance can be improved.

  Moreover, the said aluminum alloy foil for collectors has content of each element contained in a chemical component in the said specific range. Therefore, the tensile strength can be set to 190 MPa or more, and a coarse compound is hardly generated at the time of casting, and pinhole defects are not easily generated at the time of foil rolling. Therefore, gauge down with a thickness of 20 μm or less can be realized stably.

  The aluminum alloy foil for the current collector will be described. The significance of the chemical component (unit: mass%, hereinafter simply abbreviated as “%”) in the aluminum alloy foil for current collector and the reason for limitation are as follows.

Si: 0.01% to 0.4% Si is contained in the alloy as an impurity element. In order to improve the alkali corrosion resistance, it is preferable that the Si content is small. When the Si content is less than 0.01%, although it has alkali corrosion resistance, it is necessary to use high-purity aluminum ingot as a raw material, resulting in an increase in manufacturing cost. Therefore, the Si content is 0.01% or more, preferably 0.05% or more, more preferably 0.1% or more. On the other hand, when the Si content exceeds 0.4%, it becomes easy to form a compound with Mg (Mg ₂ Si or the like), the amount of Mg solid solution in the alloy decreases, and the alkali corrosion resistance decreases. Therefore, the Si content is 0.4% or less, preferably 0.35% or less, more preferably 0.3% or less.

Fe: 0.01% or more and 0.9% or less Fe is contained in the alloy as an impurity element in the same manner as Si. In order to improve the alkali corrosion resistance, it is preferable that the Fe content is small. When the Fe content is less than 0.01%, although it has alkali corrosion resistance, it is necessary to use high-purity aluminum ingot as a raw material, resulting in an increase in manufacturing cost. Therefore, the Fe content is 0.01% or more, preferably 0.05% or more, more preferably 0.1% or more. On the other hand, when the Fe content exceeds 0.9%, it becomes easy to form Al-Fe compounds, and in an alkaline environment, these compounds serve as cathodes and matrix aluminum serves as anodes, and local alkaline corrosion proceeds. It becomes easy to do. Therefore, if the thickness is 20 μm or less, a through hole may be generated in a short time. Therefore, the Fe content is 0.9% or less, preferably 0.8% or less, and more preferably 0.7% or less.

Mg: 0.1% or more and less than 1.5% Mg is an important additive element for suppressing alkali corrosion in a strong alkaline environment. In the alloy, Mg in solid solution reacts with H ₂ O to form magnesium oxide (MgO). This magnesium oxide does not react in an alkaline environment, and this compound is formed in the coating at the corrosive interface, thereby reducing the alkaline corrosion of the matrix aluminum. When the Mg content is less than 0.1%, it becomes difficult to impart alkali corrosion resistance, and alkali corrosion is likely to occur, and it becomes difficult to improve the tensile strength to 190 MPa or more. Therefore, the Mg content is 0.1% or more, preferably 0.15% or more, more preferably 0.2% or more. On the other hand, when the Mg content is 1.5% or more, work hardening becomes excessively large, and foil rolling with a thickness of 20 μm or less becomes difficult on a mass production scale. Therefore, the Mg content is less than 1.5%, preferably 1.0% or less, more preferably 0.8% or less.

  The chemical component in the aluminum alloy foil for the current collector is one or more selected from Cu: 0.01% to 0.30% and Mn: 0.1% to less than 0.50% (Claim 2). The significance of each component and the reasons for its limitation are as follows.

Cu: 0.01% or more and 0.30% or less Cu is an element that contributes to improving the strength of the foil. In order to obtain the effect, the Cu content is preferably 0.01% or more, more preferably 0.02% or more. On the other hand, if the Cu content is excessive, the electrical resistance increases. Therefore, the Cu content is preferably 0.30% or less, more preferably 0.20% or less, and still more preferably 0.10% or less.

Mn: 0.1% or more and less than 0.50% Mn is an element that contributes to improving the strength of the foil. In order to obtain the effect, the Mn content is preferably 0.1% or more, and more preferably 0.2% or more. On the other hand, when the Mn content is 0.5% or more, it becomes easy to form Al-Mn compounds, and in an alkaline environment, these compounds serve as cathodes and matrix aluminum serves as anodes, and local alkaline corrosion proceeds. It becomes easy to do. Therefore, if the thickness is 20 μm or less, a through hole may be generated in a short time. Therefore, the Mn content is preferably less than 0.50%.

  The chemical components in the current collector aluminum alloy foil are Ti: 0.01% or more and 0.10% or less, Cr: 0.01% or more and 0.40% or less, and Zr: 0.01% or more. One or more selected from 0.40% or less can further be contained (Claim 3). The significance of each component and the reasons for its limitation are as follows.

Ti: 0.01% or more and 0.10% or less Ti is an element that contributes to the refinement of the ingot structure and recrystallized grains during the production of the foil and is effective in improving the foil moldability. When the Ti content is less than 0.01%, such a fine structure effect cannot be obtained sufficiently. In order to obtain the effect, the Ti content is preferably 0.01% or more. On the other hand, if the Ti content exceeds 0.10%, it becomes easy to form a coarse Ti-based compound during the production of the ingot, and pinhole defects are likely to occur during foil rolling. Therefore, the Ti content is preferably 0.10% or less, more preferably 0.05% or less.

Cr: 0.01% or more and 0.40% or less Cr is an element effective for improving the work hardenability by the fine precipitation of the Al ₇ Cr phase and improving the strength of the foil. If the Cr content is less than 0.01%, the foil strength improvement effect cannot be obtained sufficiently. In order to obtain the effect, the Cr content is preferably 0.01% or more. On the other hand, if the Cr content exceeds 0.40%, it becomes easy to form a coarse Al ₇ Cr compound, and pinhole defects are likely to occur during foil rolling. Therefore, the Cr content is preferably 0.40% or less, more preferably 0.25% or less, and still more preferably 0.20% or less.

Zr: 0.01% or more and 0.40% or less Zr is an element effective in improving the work hardenability by the fine precipitation of the Al ₃ Zr phase and improving the strength of the foil. If the Zr content is less than 0.01%, the effect of improving the strength of the foil cannot be obtained sufficiently. In order to obtain the effect, the Zr content is preferably 0.01% or more. On the other hand, if the Zr content exceeds 0.40%, a coarse Al ₃ Zr compound is likely to be formed, and pinhole defects are likely to occur during foil rolling. Therefore, the Zr content is preferably 0.40% or less, more preferably 0.25% or less, and still more preferably 0.20% or less.

  Examples of the inevitable impurities in the chemical components of the current collector aluminum alloy foil include elements such as Zn, Ni, Ga, and V that are relatively difficult to contribute to an increase in electrical resistance. However, the content of each of these elements is preferably 0.05% or less. Moreover, if these elements are 0.15% or less in total, they can be tolerated because they do not substantially affect the characteristics of the current collector aluminum alloy foil.

  The current collector aluminum alloy foil has a thickness of 20 μm or less. The thickness of the aluminum alloy foil for the current collector is preferably 15 μm or less, more preferably 13 μm or less, from the viewpoints of gauge down and battery size reduction / thinning. On the other hand, the thickness of the aluminum alloy foil for the current collector is preferably 8 μm or more, and more preferably 10 μm or more, from the viewpoints of ease of handling at the time of manufacturing a current collector member such as a battery electrode and foil strength. .

  The aluminum alloy foil for a current collector has a tensile strength of 190 MPa or more. The tensile strength of the aluminum alloy foil is preferably 200 MPa or more, more preferably 220 MPa or more, from the viewpoint of obtaining sufficient foil strength. On the other hand, the upper limit of the tensile strength of the current collector aluminum alloy foil is not particularly limited because it is more excellent in strength, but it is preferably 340 MPa or less from the viewpoint of foil rollability. it can. In addition, the said tensile strength is the tensile strength measured based on JISZ2241 which extract | collected the test piece (JIS5 test piece) so that a tension direction might become parallel to a foil rolling direction.

  The aluminum alloy foil for a current collector can be used as an electrode current collector for a secondary battery such as a lithium ion battery or a sodium ion battery, or an electrode current collector for an electric double layer capacitor. The aluminum alloy foil for a current collector comprises at least an active material containing lithium or sodium and an element that causes hydrolysis such as nickel and water as a solvent at the time of forming an electrode of the secondary battery or the like. An aqueous paste containing and showing strong alkalinity can be applied to the foil surface. The aqueous paste can further contain a binder, and examples of the binder include styrene butadiene rubber (SBR) and carboxymethyl cellulose (CMC). Here, the pH of the aqueous paste can be set to pH = 10 or more and pH = 11 or more. Examples of the active material include lithium-nickel composite oxide (which may contain cobalt), sodium-nickel composite oxide (which may contain cobalt), and the like. .

The aluminum alloy foil for a current collector preferably has a weight loss of 41 g / m ² or less, more preferably 40 g / m ² or less. In this case, it is difficult to form through holes in the foil due to alkali corrosion. The corrosion weight loss (g / m ² ) was obtained by using a NaOH aqueous solution (temperature: 30 ° C.) having a pH = 13 as a corrosive liquid, and immersing the foil in the corrosive liquid for 20 minutes before immersion in the corrosive liquid. After that, the difference from the weight of the foil after removing the corrosion product and drying is taken as the weight loss, and the weight loss can be calculated by converting per 1 m ² .

  Next, the manufacturing method of the said aluminum alloy foil for collectors is demonstrated. The method for producing an aluminum alloy foil for a current collector is a method in which an ingot of an aluminum alloy having the specific chemical component is homogenized, hot-rolled, and then cold-rolled in a range where the final cold rolling rate is 90% or more. Rolling is performed to a thickness of 20 μm or less. The chemical composition of the ingot is 1% or more selected from mass%, Cu: 0.01% or more and 0.30% or less, and Mn: 0.1% or more and less than 0.50%. Furthermore, it can contain (Claim 5). Further, the chemical composition of the ingot is, by mass%, Ti: 0.01% or more and 0.10% or less, Cr: 0.01% or more and 0.40% or less, and Zr: 0.01% or more and 0% or less. One or more selected from 40% or less can be further contained (claim 6).

  In addition, since the meaning of each component in the chemical component of the ingot to be used and the reason for the limitation are as described above in the description of the aluminum alloy foil for the current collector, the description is omitted.

  The homogenization treatment can be performed, for example, by holding the ingot at a temperature in the range of 450 ° C. to 600 ° C. for 1 hour to 10 hours. Moreover, the temperature at the time of the said hot rolling can be 300 degreeC-500 degreeC, for example.

  In the method for producing an aluminum alloy foil for a current collector, cold rolling is performed after hot rolling. At this time, intermediate heat treatment with recrystallization such as annealing may or may not be performed between hot rolling and cold rolling, or in the middle of cold rolling. Such intermediate heat treatment is preferably performed in a continuous annealing furnace (CAL) or the like from the viewpoint of crystal grain refinement, for example, by holding at a temperature of 400 ° C. to 500 ° C. for 2 seconds to 10 seconds. be able to.

  The final cold rolling rate (%) in the cold rolling is 100 × (thickness of rolled sheet after intermediate heat treatment−aluminum alloy foil after final cold rolling when intermediate heat treatment is performed during cold rolling. The thickness of the rolled sheet after the intermediate heat treatment). Further, when intermediate heat treatment is not performed during cold rolling, 100 × (thickness of rolled plate after hot rolling and before cold rolling−thickness of aluminum alloy foil after final cold rolling) / (hot It is a value calculated from the thickness of the rolled sheet before cold rolling after rolling. The final cold rolling rate is 90% or more as described above. Thereby, coupled with the selection of the specific chemical component, it becomes easy to achieve a tensile strength of 190 MPa or more. The final cold rolling rate is preferably 95% or less from the viewpoint of increasing the tensile strength.

  The aluminum alloy foil for current collectors and the manufacturing method thereof according to the examples will be described below.

  In addition, the aluminum alloy foil for current collectors of this example is used as an electrode (positive electrode) current collector of a lithium ion battery. Then, an aqueous paste containing a positive electrode active material containing lithium and nickel, a binder, water as a solvent, and having a strong alkalinity of pH 10 or higher is applied to the foil surface during electrode formation and used. It is assumed.

  Further, in the method for producing an aluminum alloy foil for a current collector of this example, an ingot made of an aluminum alloy having a specific chemical component is subjected to homogenization treatment, hot rolling, and intermediate heat treatment at a temperature at which recrystallization occurs. The thickness was set to 20 μm or less by performing cold rolling in the middle. The final cold rolling rate during the cold rolling is 90% or more.

Example 1
An ingot was prepared by ingot-making and chamfering an aluminum alloy having chemical components shown in Table 1 by a semi-continuous casting method.

  Next, the ingot was homogenized under the condition that it was held at a temperature of 550 ° C. for 6 hours, and then hot rolled to a thickness of 2 mm. Next, a hot-rolled sheet having a thickness of 2 mm was cold-rolled to a thickness of 0.5 mm. Next, after performing an intermediate heat treatment on a cold rolled sheet having a thickness of 0.5 mm in a continuous annealing furnace at a temperature of 450 ° C. for 10 seconds, the cold rolled sheet is cooled to a thickness of 15 μm. Rolled for a while.

  In addition, since the intermediate heat treatment is performed in the manufacturing process, the final cold rolling rate is 100 × (the thickness of the rolled plate after the intermediate heat treatment 0.5 mm−the thickness of the aluminum alloy foil after the final cold rolling 15 μm) / (Thickness of rolled sheet after intermediate heat treatment 0.5 mm) = 97%.

  Next, the obtained aluminum alloy foils of Samples 1 to 14 were examined for alkali corrosion resistance, tensile strength, and occurrence of pinholes.

<Alkali corrosion resistance>
A test piece having a size of 100 mm in length and 100 mm in width was collected from the aluminum alloy foil. Next, the test piece was immersed in a corrosive solution in which NaOH was added to distilled water to control pH = 13 and the temperature to 30 ° C. for 20 minutes. Subsequently, the test piece was taken out from the corrosive liquid and washed with distilled water. Next, the corrosion product formed on the surface of the test piece was removed with a 10 wt% HNO ₃ solution (20 ° C.) and dried. Next, the difference between the weight of the test piece before immersion in the corrosive liquid and the weight of the test piece after removal and drying of the corrosion product was determined, and the weight loss of the test piece due to alkali corrosion was measured. Then, the average value of the calculated corrosion weight loss (n = 3) by converting the decrease was measured by weight per 1 m ^2, and the corrosion loss of the sample (g / m ^2). Moreover, the through-hole generation | occurrence | production state by the alkali corrosion in a test piece was confirmed visually.

<Tensile strength>
A test piece (JIS No. 5 test piece) was taken from each aluminum alloy foil so that the tensile direction was parallel to the foil rolling direction, and the tensile strength measured in accordance with JIS Z2241 was taken as the tensile strength of each sample.

<Presence / absence of pinhole>
Ten test pieces each having a size of 100 mm in length and 100 mm in width were collected from the aluminum alloy foil. Then, in the dark room, the light of the fluorescent lamp was irradiated from the back surface of the test piece, and the presence or absence of light leaking to the surface of the test piece was visually confirmed. When there was no light leak in all 10 test pieces, it was determined that there was no pinhole. Further, if any one of the 10 test pieces had light leakage, it was determined that there was a pinhole.

  The results obtained are summarized in Table 2.

  As shown in Table 2, Sample 13 is a conventional 1N30 alloy foil, and Mg is not added to the chemical components. Therefore, there was much corrosion weight loss and the through-hole by alkali corrosion was recognized, and it was inferior to alkali corrosion resistance.

  Sample 14 is a conventional 3003 alloy foil. Corrosion weight loss was larger than that of the 1N30 alloy foil of Sample 13, and through-holes due to alkali corrosion were also observed, which was inferior in alkali corrosion resistance.

  Sample 8 has an Mg content of less than 0.1%. Therefore, the weight loss of the corrosion was the same as that of the 1N30 alloy foil of Sample 13, and through-holes due to alkali corrosion were also observed, which was inferior in alkali corrosion resistance. Moreover, the tensile strength was less than 190 MPa, and it did not have sufficient strength.

Sample 9 has a Si content exceeding 0.4%. Therefore, the weight loss of the corrosion was the same as that of the 1N30 alloy foil of Sample 13, and through-holes due to alkali corrosion were also observed, which was inferior in alkali corrosion resistance. This is presumably because the formation of Mg ₂ Si phase was induced and the amount of Mg solid solution decreased.

  Sample 10 has an Mg content of less than 0.1%. Therefore, although not as much as the 1N30 alloy foil of Sample 13, the corrosion weight loss was large, and through-holes due to alkali corrosion were also observed, and the alkali corrosion resistance was poor.

  Sample 11 has a Ti content exceeding 0.10%. Therefore, a coarse Ti compound was generated during casting, and pinhole defects were generated during foil rolling.

Sample 12 has a Cr content exceeding 0.40%. Therefore, a coarse Al ₇ Cr compound was generated during casting, and pinhole defects were generated during foil rolling.

  On the other hand, all of the samples 1 to 7 whose chemical components are within the specific range described above have less corrosion weight loss than the 1N30 alloy foil of the sample 13, and the occurrence of through holes is not recognized. It turns out that it is excellent in alkali-corrosion resistance. In addition, it can be seen that Samples 1 to 7 have a tensile strength of 190 MPa or more, which is sufficient compared to the 1N30 alloy foil of Sample 13. Moreover, it turns out that the sample 1-7 does not produce a pinhole defect easily at the time of foil rolling.

(Example 2)
A hot-rolled sheet was produced in the same manner as in Example 1 using the ingots of Alloy E and Alloy M shown in Table 1. Next, the obtained hot-rolled sheet was made into a cold-rolled sheet having a predetermined thickness by adjusting the cold rolling before performing the intermediate heat treatment in Example 1. Next, this cold-rolled sheet was subjected to an intermediate heat treatment under the same conditions as in Example 1, and then cold-rolled at the final cold rolling rate shown in Table 3 to a thickness of 15 μm. The obtained aluminum alloy foils of Samples 15 to 19 were examined in the same manner as in Example 1 for alkali corrosion resistance, tensile strength, and occurrence of pinholes. The results obtained are summarized in Table 3.

  As shown in Table 3, the sample 19 uses a conventional 1N30 alloy. Therefore, sufficient strength cannot be obtained, and the alkali corrosion resistance is inferior.

  Samples 17 and 18 were both subjected to cold rolling at a final cold rolling rate of less than 90% to obtain aluminum alloy foils having a thickness of 20 μm or less. Therefore, in any case, the tensile strength was less than 190 MPa, and sufficient strength could not be obtained.

  On the other hand, Sample 15 and Sample 16 were subjected to homogenization treatment and hot rolling of the ingot of the aluminum alloy having the specific chemical component described above, and then cold rolled in a range where the final cold rolling rate was 90% or more. The thickness is 20 μm or less. For this reason, an aluminum alloy foil having a tensile strength of 190 MPa or more and sufficient strength was obtained. Also, pinhole defects were hardly generated during foil rolling. The obtained aluminum alloy foil was excellent in alkali corrosion resistance because of little corrosion weight loss and no occurrence of through holes.

  As mentioned above, although the Example was described, this invention is not limited by the said Example, A various deformation | transformation can be performed within the range which does not impair the meaning of this invention.

Claims (6)

The chemical component contains, by mass, Si: 0.01% or more and 0.4% or less, Fe: 0.01% or more and 0.9% or less, Mg: 0.1% or more and less than 1.5%, The balance consists of Al and inevitable impurities,
An aluminum alloy foil for a current collector having a thickness of 20 μm or less and a tensile strength of 190 MPa or more. The aluminum alloy foil for a current collector according to claim 1,
The chemical component further contains one or more selected from Cu: 0.01% or more and 0.30% or less and Mn: 0.1% or more and less than 0.50% by mass. An aluminum alloy foil for a current collector. The aluminum alloy foil for current collector according to claim 1 or 2,
From the above chemical components in mass%, Ti: 0.01% or more and 0.10% or less, Cr: 0.01% or more and 0.40% or less, and Zr: 0.01% or more and 0.40% or less An aluminum alloy foil for a current collector, further comprising one or more selected.   The chemical component contains, by mass, Si: 0.01% or more and 0.4% or less, Fe: 0.01% or more and 0.9% or less, Mg: 0.1% or more and less than 1.5%, The ingot is made of Al and inevitable impurities, and the ingot is subjected to homogenization treatment and hot rolling, followed by cold rolling in a range where the final cold rolling rate is 90% or more, so that the thickness is 20 μm or less. A method for producing an aluminum alloy foil for a current collector. It is a manufacturing method of the aluminum alloy foil for current collectors according to claim 4,
The chemical component further contains one or more selected from Cu: 0.01% or more and 0.30% or less and Mn: 0.1% or more and less than 0.50% by mass. The manufacturing method of the aluminum alloy foil for electrical power collectors characterized by the above-mentioned. It is a manufacturing method of the aluminum alloy foil for current collectors according to claim 4 or 5,
From the above chemical components in mass%, Ti: 0.01% or more and 0.10% or less, Cr: 0.01% or more and 0.40% or less, and Zr: 0.01% or more and 0.40% or less The manufacturing method of the aluminum alloy foil for collectors characterized by further containing 1 type, or 2 or more types selected.