WO2011040292A1 - アルミニウム貫通箔及びその製造方法 - Google Patents
アルミニウム貫通箔及びその製造方法 Download PDFInfo
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- WO2011040292A1 WO2011040292A1 PCT/JP2010/066358 JP2010066358W WO2011040292A1 WO 2011040292 A1 WO2011040292 A1 WO 2011040292A1 JP 2010066358 W JP2010066358 W JP 2010066358W WO 2011040292 A1 WO2011040292 A1 WO 2011040292A1
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/64—Carriers or collectors
- H01M4/66—Selection of materials
- H01M4/661—Metal or alloys, e.g. alloy coatings
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C21/00—Alloys based on aluminium
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22F—CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS
- C22F1/00—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22F—CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS
- C22F1/00—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
- C22F1/04—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of aluminium or alloys based thereon
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES, LIGHT-SENSITIVE OR TEMPERATURE-SENSITIVE DEVICES OF THE ELECTROLYTIC TYPE
- H01G11/00—Hybrid capacitors, i.e. capacitors having different positive and negative electrodes; Electric double-layer [EDL] capacitors; Processes for the manufacture thereof or of parts thereof
- H01G11/66—Current collectors
- H01G11/68—Current collectors characterised by their material
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES, LIGHT-SENSITIVE OR TEMPERATURE-SENSITIVE DEVICES OF THE ELECTROLYTIC TYPE
- H01G11/00—Hybrid capacitors, i.e. capacitors having different positive and negative electrodes; Electric double-layer [EDL] capacitors; Processes for the manufacture thereof or of parts thereof
- H01G11/66—Current collectors
- H01G11/70—Current collectors characterised by their structure
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES, LIGHT-SENSITIVE OR TEMPERATURE-SENSITIVE DEVICES OF THE ELECTROLYTIC TYPE
- H01G11/00—Hybrid capacitors, i.e. capacitors having different positive and negative electrodes; Electric double-layer [EDL] capacitors; Processes for the manufacture thereof or of parts thereof
- H01G11/74—Terminals, e.g. extensions of current collectors
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/64—Carriers or collectors
- H01M4/66—Selection of materials
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- 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
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- 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
- Y02E60/13—Energy storage using capacitors
-
- 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
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T29/00—Metal working
- Y10T29/30—Foil or other thin sheet-metal making or treating
- Y10T29/301—Method
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- 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
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/12—All metal or with adjacent metals
- Y10T428/12361—All metal or with adjacent metals having aperture or cut
Definitions
- the present invention relates to a novel aluminum penetration foil. More specifically, the present invention relates to an aluminum penetrating foil suitably used for a current collector such as a lithium ion battery, a lithium ion capacitor, or an electric double layer capacitor.
- a current collector such as a lithium ion battery, a lithium ion capacitor, or an electric double layer capacitor.
- Lithium ions can be supported on the negative electrode active material by allowing lithium ions to move reversibly through the through holes of the current collector.
- a method for producing a current collector having a through hole for example, punching, meshing, expanding, and netting are known.
- the size of the through hole formed by these methods is generally 0. 0. 3 mm or more.
- the strength of the current collector is reduced accordingly, and the problem of strength reduction becomes greater with a relatively large hole diameter as described above.
- an electrode using a current collector having relatively fine through holes has been proposed.
- a positive electrode made of a material capable of reversibly supporting lithium ions and / or anions and a negative electrode made of a material capable of reversibly supporting lithium ions are provided, and an aprotic organic lithium salt is used as an electrolyte.
- a lithium ion capacitor comprising a solvent electrolyte solution, wherein (1) lithium ions are doped into the negative electrode and / or positive electrode by electrochemical contact between the negative electrode and / or positive electrode and a lithium ion supply source;
- the potential of the positive electrode after short-circuiting the negative electrode is 2.0 V or less, (3) the positive electrode and / or the negative electrode has a large number of holes penetrating the front and back surfaces, and an inscribed circle of these through holes
- a lithium ion capacitor having a current collector made of a metal foil having an average diameter of 100 ⁇ m or less Patent Document 1.
- the current collector is made of an aluminum etching foil having a thickness of 20 to 45 ⁇ m, an apparent density of 2.00 to 2.54 g / cm 3 , and having a large number of through holes penetrating the front and back surfaces having an air permeability of 20 to 120 s.
- an electrode layer formed by applying a paint containing a material capable of reversibly supporting lithium ions and anions as an active material on the current collector A coated electrode is known in which 80% or more of the through holes of the current collector have a hole diameter of 1 to 30 ⁇ m (Patent Document 2).
- aluminum foil for electrolytic capacitors is known as an aluminum foil having a uniform crystal orientation (for example, Patent Document 3 and Patent Document 4).
- batteries and capacitors are strongly required to be light and small in size as well as high energy density and high output density. With such a demand, there is a demand for reducing the thickness of the current collector.
- a main object of the present invention is to provide an aluminum foil having a large number of through holes and a desired foil strength.
- the present inventor has found that the above object can be achieved by subjecting an aluminum foil having a through hole to a predetermined processing, thereby completing the present invention. It came.
- this invention relates to the following aluminum penetration foil and its manufacturing method.
- An aluminum through foil having a plurality of through holes from the foil surface to the back surface, (1) The foil thickness is 50 ⁇ m or less, (2) The breaking strength is [0.2 ⁇ foil thickness ( ⁇ m)] N / 10 mm or more.
- a high-strength aluminum penetration foil characterized by that. 2.
- Item 2. The high-strength aluminum penetrating foil according to Item 1, wherein the breaking strength is [0.3 ⁇ foil thickness ( ⁇ m)] N / 10 mm or more. 3.
- the high-strength aluminum penetrating foil according to Item 1 wherein the density of the through-holes is 1 ⁇ 10 4 pieces / cm 2 or more. 5.
- Item 2. The high-strength aluminum penetrating foil according to Item 1, wherein the [proof value / breaking strength] is 50% or more. 6).
- Item 2. The high-strength aluminum penetrating foil according to Item 1, wherein the air permeability measured by a gas permeability test method using a Gurley type densometer according to JIS P 8117 is 5 sec / 100 ml or more. 7). 2.
- Item 2 The high-strength aluminum penetrating foil according to Item 1, wherein the surface area expansion ratio is a value of [0.10 ⁇ foil thickness ( ⁇ m)] or more. 9. Item 2. The high-strength aluminum penetrating foil according to Item 1, having a composition comprising Fe: 5 to 80 ppm by weight, Si: 5 to 100 ppm by weight, Cu: 10 to 100 ppm by weight, and the balance: Al and inevitable impurities. 10. Item 2. The high-strength aluminum penetrating foil according to Item 1, wherein the ratio [c / t] of the vertical through-hole occupation ratio c (%) and the foil thickness t ( ⁇ m) in the aluminum penetrating foil is 1.4 or more. 11. 2.
- the method for producing a high-strength aluminum penetrating foil according to item 1 comprising a step of embossing the aluminum penetrating foil having a plurality of through-holes from the foil surface to the back surface.
- a method for producing a penetrating foil. 12 2.
- the manufacturing method of high-strength aluminum penetration foil comprising a step of embossing the aluminum penetrating foil having a plurality of through-holes from the foil surface to the back surface.
- the aluminum through foil of the present invention it is possible to provide an aluminum foil having a number of through holes and a desired foil strength.
- the foil has a large number of through holes, and the foil thickness is as thin as 50 ⁇ m or less (particularly 25 ⁇ m or less), and at the same time the breaking strength is [0.3 ⁇ foil thickness ( ⁇ m)] N / 10mm or more, and the elongation at break is [0.05 ⁇ foil thickness ( ⁇ m)]% or less, so that it can function as a current collector, etc. It can be carried out. That is, as a result of effectively avoiding wrinkles and the like during coating on the Al foil of the present invention, smooth post-processing is possible. For example, it is possible to smoothly apply a paste containing an electrode active material without any trouble.
- the aluminum through-foil of Embodiment 2 has sufficient through-holes to obtain excellent characteristics as a current collector even if the foil thickness is as thin as 50 ⁇ m or less (particularly 25 ⁇ m or less), and facilitates subsequent processes.
- strength which can be performed to can be provided. That is, the high-strength aluminum penetrating foil of the present invention has a breaking strength of [0.2 ⁇ foil thickness ( ⁇ m)] N / 10 mm or more, and [proof strength value / breaking strength] (ratio of strength value to breaking strength). ) Can exhibit an excellent characteristic of 50% or more.
- Such an aluminum penetrating foil can be suitably used as a current collector such as a lithium ion battery, a lithium ion capacitor, or an electric double layer capacitor.
- a lithium ion capacitor or a lithium ion secondary battery includes 1) a positive electrode made of a material capable of reversibly carrying lithium ions and / or anions, and 2) a negative electrode made of a material capable of reversibly carrying lithium ions and 3
- the aluminum through-foil of the present invention is useful as a current collector that contains an electrolyte solution containing lithium ions and is doped with lithium ions on the positive electrode and / or the negative electrode.
- the high-strength aluminum penetrating foil of the present invention is an aluminum penetrating foil having a plurality of through-holes from the foil surface to the back surface, (1)
- the foil thickness is 50 ⁇ m or less
- the breaking strength is [0.2 ⁇ foil thickness ( ⁇ m)] N / 10 mm or more. It is characterized by that.
- the Al foil of the present invention has a plurality of through holes from the foil surface to the back surface.
- FIG. 1 the schematic diagram of the cross section of this invention Al foil is shown.
- the Al foil 1 of the present invention has a plurality of through holes 2 extending from the foil surface 11 to the back surface 12.
- Such a through hole can be formed by performing an etching process.
- preferred embodiments 1 and 2 of the present invention will be described as representative examples.
- Embodiment 1 (A-1) Al foil according to Embodiment 1
- the Al foil according to Embodiment 1 is an aluminum through foil having a plurality of through holes from the foil surface to the back surface, (1) The foil thickness is 50 ⁇ m or less, (2) The breaking strength is [0.3 ⁇ foil thickness ( ⁇ m)] N / 10 mm or more, (3) The elongation at break is [0.05 ⁇ foil thickness ( ⁇ m)]% or less, It is characterized by that.
- the inner diameter of the through-hole through holes, Al foil applications and can be set appropriately according to the intended use or the like, normally is preferably set to 0.2 ⁇ 5 [mu] m, particularly 0.5 ⁇ 3 [mu] m.
- the inner diameter of the through hole can be appropriately controlled by adjusting the etching time particularly during the etching process.
- the ratio of the presence of the through holes is not particularly limited, but in general, the air permeability measured by a Gurley densometer according to JIS P 8117 is 5 sec / 100 ml or more, particularly 20 sec / 100 ml. The above is preferable. By having such air permeability, even if an active material is applied to the Al foil of the present invention, the active material does not get through, and the active material is not applied to unnecessary portions. The effect that pre-processing becomes unnecessary is acquired.
- the upper limit value of the air permeability is not particularly limited, but is usually about 500 sec / 100 ml.
- the ratio [c / t] of the vertical through-hole occupation ratio c (%) and the foil thickness t ( ⁇ m) in the aluminum through foil is 1.4 or more, preferably 1.5 or more. More preferably, it is 1.6 or more.
- the Al foil of the present invention exhibits a higher vertical through-hole occupation ratio even at the same thickness as compared with the conventional aluminum through foil. That is, the Al foil of the present invention has a higher vertical through-hole occupancy rate despite its small thickness.
- the thickness of the high-purity aluminum foil is reduced, the cube orientation occupancy decreases, and the vertical through-hole occupancy decreases accordingly.
- the cube orientation occupancy corresponds to a value about the value of foil thickness ( ⁇ m)%.
- the cube orientation occupation ratio is approximately 55%.
- the present invention by controlling the content of Fe, Si, Cu, etc., it is possible to realize a higher cubic orientation occupancy than the prior art even with a thin foil. It becomes possible to increase the occupation ratio.
- the value of the vertical through-hole occupancy itself in the Al foil of the present invention is not particularly limited because it varies depending on the foil thickness and the like, but is generally 30 to 98%, particularly 40 to 98%. If it is in the range.
- the through holes are 70 to 110 from the horizontal plane.
- a vertical through hole is defined as an angle having an angle in the range of degrees (that is, 90 ° ⁇ 20 °), and the ratio of the vertical through hole to the total number of through holes is defined as the vertical through hole occupation ratio. Therefore, the vertical through-hole occupation ratio in the present invention is almost the same value as the cube orientation occupation ratio of the aluminum foil before etching.
- the surface area expansion ratio is a value of [0.10 ⁇ foil thickness t ( ⁇ m)] or more, and particularly preferably a value of [0.15 ⁇ foil thickness t ( ⁇ m)] or more. .
- the density of the through holes is not limited, but usually it is preferably 1 ⁇ 10 4 pieces / cm 2 or more, and more preferably 5 ⁇ 10 4 pieces / cm 2 or more. .
- the density of the through holes is 1 ⁇ 10 4 pieces / cm 2 or more, for example, it is possible to more effectively prevent the pre-doping time from being delayed.
- the thickness of the Al foil of the present invention is usually 50 ⁇ m or less, preferably 40 ⁇ m or less, more preferably 25 ⁇ m or less. By setting to the above thickness, it can be suitably used as a current collector of a lithium ion capacitor.
- the lower limit value of the thickness is not limited, but is usually about 1 ⁇ m.
- the “foil thickness” in the present invention refers to the thickness of a portion not subjected to embossing described later.
- the embossed foil thickness of the present invention is usually 95 ⁇ m or less, preferably 90 ⁇ m or less. By setting to the above thickness, it can be suitably used as a current collector of a lithium ion capacitor.
- the lower limit value of the thickness is not limited, but is usually about 1.3 ⁇ m.
- the “embossed foil thickness” in the present invention refers to the total thickness t including the height (depth) of the embossed shape in the embossed Al foil 31 as shown in FIG.
- the Al foil of the present invention has a breaking strength of [0.3 ⁇ foil thickness ( ⁇ m)] N / 10 mm or more, preferably [0.35 ⁇ foil thickness ( ⁇ m)] N / 10 mm or more. is there.
- the breaking strength is 15 N / 10 mm or more.
- the breaking strength generally decreases as the foil thickness decreases, but in the present invention, the degree of decrease is small, and the same foil thickness shows a higher breaking strength than the conventional product.
- the Al foil of the present invention has a relatively high breaking strength of about 8 to 15 N / 10 mm at a thickness of 30 to 50 ⁇ m, but may have a higher breaking strength.
- the upper limit of the breaking strength is not limited, it is usually about 50 N / 10 mm if the foil thickness is 50 ⁇ m or less, and usually about 25 N / 10 mm if the foil thickness is 25 ⁇ m or less.
- the elongation at break in the Al foil of the present invention is [0.05 ⁇ foil thickness ( ⁇ m)]% or less, preferably [0.04 ⁇ foil thickness ( ⁇ m)]% or less.
- the elongation at break exceeds [0.05 ⁇ foil thickness ( ⁇ m)]%, there is a problem that wrinkles are likely to occur during coating, and burrs are likely to occur at the end during punching.
- by setting the breaking elongation within the above range it is possible to obtain an effect that wrinkles are less likely to occur during coating, and burrs are less likely to occur at the end during punching.
- composition of the Al foil of the present invention is not limited as long as it has the above-mentioned characteristics, and a composition in a known Al foil can also be adopted.
- Fe 5 to 80 ppm by weight
- Si 5 to 100 ppm by weight
- Cu 10 to 100 ppm by weight
- Al and inevitable impurities can be suitably employed.
- the Fe content is usually about 5 to 80 ppm, preferably 10 to 50 ppm.
- Fe is an element that can be crystallized as an Al—Fe-based compound to improve rolling properties and elongation.
- an appropriate amount of the Al—Fe-based compound refines the crystal grains by crystal nucleation sites and pinning, and improves the rollability of the thin foil.
- the Fe content is less than 5 ppm, the above effect cannot be obtained, and the strength of the foil is reduced due to the coarsening of the crystal grains, and the strength of the penetrating foil is reduced and the strength varies depending on the part.
- the Fe content exceeds 80 ppm, excessive dissolution occurs on the surface, leading to a decrease in strength of the penetrating foil and a variation in strength due to the site. Further, the occupation ratio of the cube orientation is lowered, and a sufficient through etching pit density cannot be obtained.
- the Si content is usually about 5 to 100 ppm, preferably 10 to 60 ppm.
- Si is an element that can mainly improve the strength.
- an instantaneous temperature rise is caused not only on the surface of the aluminum penetrating foil but also on the inside, but dislocation disappears due to the presence of silicon. It can suppress and the fall of intensity
- the Si content is less than 5 ppm, the above effects cannot be obtained, and the strength is lowered, and the strength of the penetrating foil is easily reduced and the strength varies depending on the portion.
- the Si content exceeds 100 ppm, the occupation ratio of the cube orientation becomes low, and a sufficient through etching pit density cannot be obtained.
- the Cu content is usually about 10 to 100 ppm, preferably 15 to 60 ppm.
- the rollability when rolling to a foil thickness of 25 ⁇ m or less can be further improved.
- Cu also improves the solubility during hydrochloric acid etching and contributes to the formation of through-etching pits.
- the above effect cannot be obtained sufficiently, and the rollability of the thin foil is remarkably lowered.
- the content of Cu exceeds 100 ppm, excessive dissolution occurs on the surface, leading to a decrease in strength of the penetrating foil and a variation in strength due to the site. Further, the occupation ratio of the cube orientation is lowered, and a sufficient through etching pit density cannot be obtained.
- the Al foil of the present invention may contain Pb as necessary.
- Pb mainly promotes the reaction between the electrolytic solution used for the etching process and the aluminum foil and increases the initial number of etching pits, so that a higher penetration etching density can be achieved.
- the Pb content is usually about 0.01 to 20 ppm, preferably 0.05 to 10 ppm.
- Pb mainly promotes the reaction between the electrolytic solution used for the etching treatment and the aluminum foil and increases the initial number of etching pits, so that a higher penetration etching density can be achieved.
- the content of Pb in the case of containing Pb can be appropriately adjusted so as to achieve the above effects, but it is usually about 0.01 to 20 ppm, preferably 0.05 to 10 ppm.
- Pb in the Al foil of the present invention, it is desirable to set Pb to be in the range of 40 to 2000 ppm in the region from the surface of the aluminum foil to a depth of 0.1 ⁇ m.
- the penetration etching density can be further increased.
- Such adjustment of the Pb content can be carried out, for example, by adjusting the amount of Pb added to the molten aluminum in the production stage of the aluminum foil and further controlling the annealing temperature within a range of 450 ° C. or higher. .
- the balance is substantially made of Al and inevitable impurities.
- the aluminum purity in the aluminum alloy foil of the present invention is not particularly limited as long as it is within a range that can be used for a current collector.
- Inevitable impurities may include, for example, Mg, Mn, Zn, Ti, V, Ga, Cr, Zr, and B.
- Embodiment 1 includes a method for producing a high-strength aluminum penetrating foil characterized by including a step of embossing (processing according to the present invention) an aluminum penetrating foil having a plurality of through holes extending from the foil surface to the back surface.
- a step of embossing processing according to the present invention
- an Al foil can be suitably manufactured.
- the aluminum penetrating foil (raw foil) can be prepared by a known method, but it is particularly preferable to prepare it according to the following method.
- an ingot is produced by preparing a molten raw material having the above composition and solidifying the molten metal.
- the homogenization temperature is 550 ° C. or lower.
- the ingot is hot rolled and cold rolled to obtain a thick foil of about 350 ⁇ m.
- the thickness of the thin foil after rolling is preferably 110 to 130% of the thickness of the final foil.
- the temperature of cold rolling itself can be implemented within the temperature range which does not exceed 120 degreeC.
- the thin foil rolling (at least the final rolling (that is, rolling for obtaining the final foil)) has an average roughness Ra of the rolling roll of 0.25 ⁇ m or less, particularly 0.20 ⁇ m or less, and further 0.18 ⁇ m or less. It is preferable that In this case, the average roughness Ra of the thin foil obtained is 0.25 ⁇ m or less, particularly 0.20 ⁇ m or less, and further 0.18 ⁇ m or less on the surface in contact with the rolling roll.
- a thin foil when a thin foil is obtained by rolling a thick foil, it is preferable to perform rolling while ensuring a surface that does not contact the rolling roll.
- By securing a surface that does not come into contact with the rolling roll it is possible to eliminate a factor that hinders the movement of crystal grains, and thereby a high cube orientation occupation ratio can be obtained even with a thin foil.
- the total thickness when the foils are overlapped is preferably 350 ⁇ m or less. Separation of the laminated foils can be carried out before and / or after the next step, annealing. Also in this combined rolling, it is preferable that the average roughness Ra of the rolling roll is 0.25 ⁇ m or less, particularly 0.20 ⁇ m or less, and further 0.18 ⁇ m or less.
- the heat treatment temperature is desirably 350 ° C. or lower.
- the atmosphere of the intermediate annealing is not limited, and may be any of, for example, vacuum, air, inert gas atmosphere, and the like.
- the thin foil is further cold-rolled to obtain a final foil having a desired foil thickness (a foil having a final foil thickness). That is, a foil having a thickness of 50 ⁇ m or less can be obtained by this cold rolling.
- the average roughness Ra of the rolling roll is preferably 0.25 ⁇ m or less, particularly 0.20 ⁇ m or less, and further preferably 0.18 ⁇ m or less.
- the foil may be washed for the purpose of removing rolling oil, impurities and oxide film on the foil surface, for example. You may dry suitably after washing
- high-temperature annealing is performed with excessively applied rolling oil, a part of the foil surface is yellowed in a spot shape, and etching pits having a desired shape may not be obtained even if etching is performed.
- the annealing temperature is not limited, it is usually 450 ° C. or higher, preferably 450 ° C. or higher and lower than 660 ° C., more preferably 500 to 620 ° C.
- the annealing temperature is lower than 450 ° C., the cube orientation ratio is lowered, and there is a possibility that etching pits having a desired shape cannot be obtained even if etching is performed.
- the annealing time is generally about 1 to 100 hours, although it depends on the annealing temperature.
- the annealing atmosphere is desirably substantially a vacuum or an inert gas atmosphere.
- the temperature exceeds 350 ° C. including the temperature raising and lowering steps, it is desirable to reduce the oxygen concentration in the annealing atmosphere as much as possible industrially. That is, it is desirable that the pressure be 10 ⁇ 5 Torr or less or an inert gas atmosphere containing 0 to 1% by volume of oxygen.
- an inert gas atmosphere in which the oxygen concentration in the vacuum atmosphere or annealing atmosphere exceeding 10 ⁇ 5 Torr exceeds 1.0% by volume, a part of the foil surface after annealing turns yellow into a spot shape, and etching treatment is performed.
- the through hole is formed by performing an etching process on the foil (final foil) thus obtained.
- the method for the etching treatment is not limited, and a desired through hole may be formed by one-stage etching, or may be performed in two stages or more.
- a desired through hole is suitably formed by forming at least two stages of etching and forming a through hole by the first stage etching and adjusting the inner diameter of the through hole by the second stage etching. Can do.
- the first-stage etching is preferably direct-current etching in an electrolyte containing hydrochloric acid as a main component.
- etching pits are mainly formed and the density and shape (through shape) can be controlled.
- the electrolytic solution an aqueous solution in which 1 to 10% by weight of hydrochloric acid is dissolved in water can be used. In this case, 0.001 to 0.1% by weight of oxalic acid, phosphoric acid, sulfuric acid or the like may be added to the electrolytic solution.
- the liquid temperature is about 60 to 90 ° C.
- the current density is about 0.1 to 0.5 A / cm 2 .
- the etching method is preferably direct current etching.
- the etching time can be appropriately set according to the foil thickness, the target air permeability, and the like.
- the etching pit diameter can be mainly controlled.
- chemical etching can be performed in a liquid having the same composition and temperature as the first-stage etching.
- the etching time can be appropriately set according to, for example, the foil thickness and the target air permeability.
- hydrochloric acid it is not always necessary to use hydrochloric acid as a main component, and it may be an electrolyte containing nitric acid as a main component.
- electrolytic etching instead of chemical etching.
- “second-stage etching” may be further multi-staged by combining chemical etching, electrolytic etching, and etching solution composition.
- the present invention processing is carried out. That is, embossing of the raw foil is performed.
- the foil thickness of the original foil may be changed somewhat after the processing of the present invention as long as the through-hole is substantially retained, but the rate of change of the foil thickness is 10% or less, particularly 5% or less. Furthermore, it is preferable to make it 1% or less. That is, it is most preferable to emboss the original foil while substantially maintaining the thickness of the original foil.
- the rate of change is controlled within the above range.
- the aluminum foil is heat-treated (annealed) and completely recrystallized before etching, and preferably one recrystallized grain is the foil. It is necessary to penetrate the cross section.
- embossing is performed on the original foil that has been etched to impart penetrability, thereby improving the breaking strength and the like, improving the handling properties, and suppressing the occurrence of foil breakage and wrinkles.
- the fracture strength of the aluminum foil before etching is about 50 N / mm 2 or less, and the proof stress value is about 20 N / mm 2 or less.
- strength improvement by adding (alloying) elements such as Fe, Si, Cu, etc. can be considered, but these elements cannot be added in large amounts because they hinder etching properties, and in practice It is difficult to improve strength by alloying.
- the strength can be improved without affecting the air permeability or the like by applying a slight processing to the original foil after etching. That is, the proof stress value can be increased by carrying out a relatively light embossing process and introducing a processing strain. Since the handleability of the thin foil is almost determined by this yield strength value, the handleability can be improved by increasing the yield strength value.
- the embossing method is not particularly limited as long as the rate of change of the foil thickness can be within a range of 10% or less as described above, and can be carried out using a known or commercially available embossing machine.
- the embossed pattern on the roll is transferred to the surface of the aluminum penetrating foil, thereby providing an embossed pattern (unevenness) on the surface of the aluminum penetrating foil.
- the roll may be either single-sided embossed or double-sided embossed, but in the present invention, it is preferably single-sided embossed.
- a combination of resin rolls in which one is a metal roll having an emboss pattern and the other has no emboss pattern can be suitably employed.
- the number of meshes of the embossed pattern of the roll can be appropriately set according to the desired strength or the like, generally within a range of 50 to 225 mesh.
- the foil thickness is 30 to 50 ⁇ m, it is preferably 50 to 200 mesh, and more preferably 100 to 200 mesh.
- various shapes can be adopted as the embossed pattern shape (uneven shape), for example, trapezoidal shape (trapezoidal cup), pyramid shape (triangular pyramid) (pyramid type cup), turtle shell shape, triangular diagonal line shape, trapezoidal shape Any known or commercially available roll pattern such as a hatched type can be employed.
- the height (depth) of the embossed shape can be appropriately set within a range equal to or less than the thickness of the aluminum foil.
- the thickness within the range of 60 to 90%, particularly 60 to 80% of the thickness of the aluminum foil.
- the pressure can be appropriately adjusted within a range in which the change rate of the thickness of the aluminum penetrating foil is within 10%, but is usually within a range of 1 to 15 kg / cm 2 .
- Embodiment 2 (B-1) Al foil according to Embodiment 2
- a high-strength aluminum penetrating foil of the second embodiment is an aluminum penetrating foil having a plurality of through-holes from the foil surface to the back surface, (1) The foil thickness is 50 ⁇ m or less, (2) The breaking strength is [0.2 ⁇ foil thickness ( ⁇ m)] N / 10 mm or more, (3) [proof value / breaking strength] is 50% or more, It is characterized by that.
- the inner diameter of the through-hole through holes, Al foil applications and can be set appropriately according to the intended use or the like, normally is preferably set to 0.2 ⁇ 5 [mu] m, particularly 0.5 ⁇ 3 [mu] m.
- the inner diameter of the through hole can be appropriately controlled by adjusting the etching time particularly during the etching process.
- the air permeability measured by the air permeability test method using a Gurley type densometer according to JIS P 8117 is 5 sec / 100 ml or more, particularly 30 sec / 100 ml. The above is preferable.
- the upper limit value of the air permeability is not particularly limited, but is usually about 500 sec / 100 ml.
- the ratio [c / t] of the vertical through-hole occupation ratio c (%) and the foil thickness t ( ⁇ m) in the aluminum through foil is 1.4 or more, preferably 1.5 or more. More preferably, it is 1.6 or more.
- the Al foil of the present invention exhibits a higher vertical through-hole occupation ratio even at the same thickness as compared with the conventional aluminum through foil. That is, the Al foil of the present invention has a higher vertical through-hole occupancy rate despite its small thickness.
- the thickness of the high-purity aluminum foil is reduced, the cube orientation occupancy decreases, and the vertical through-hole occupancy decreases accordingly.
- the cube orientation occupancy corresponds to a value about the value of foil thickness ( ⁇ m)%.
- the cube orientation occupation ratio is approximately 55%.
- the present invention by controlling the content of Fe, Si, Cu, etc., it is possible to realize a higher cubic orientation occupancy than the prior art even with a thin foil. It becomes possible to increase the occupation ratio.
- the value of the vertical through-hole occupancy itself in the Al foil of the present invention is not particularly limited because it varies depending on the foil thickness and the like, but is generally 30 to 98%, particularly 40 to 98%. If it is in the range.
- the through holes are 70 to 110 from the horizontal plane.
- a vertical through hole is defined as an angle having an angle in the range of degrees (that is, 90 ° ⁇ 20 °), and the ratio of the vertical through hole to the total number of through holes is defined as the vertical through hole occupation ratio. Therefore, the vertical through-hole occupation ratio in the present invention is almost the same value as the cube orientation occupation ratio of the aluminum foil before etching.
- the surface area expansion ratio is preferably a value of [0.15 ⁇ foil thickness t ( ⁇ m)] or more, and particularly preferably a value of [0.17 ⁇ foil thickness t ( ⁇ m)] or more.
- the through porosity s (%) [measured weight (g) / [foil thickness (cm) ⁇ sample area (cm 2 )]] / aluminum specific gravity (2.70 g / cm 3 ) Is preferably in the range of 5 ⁇ s ⁇ 20.
- the thickness of the Al foil of the present invention is usually 50 ⁇ m or less, preferably 40 ⁇ m or less, more preferably 25 ⁇ m or less. By setting to the above thickness, it can be suitably used as a current collector of a lithium ion capacitor.
- the lower limit value of the thickness is not limited, but is usually about 1 ⁇ m.
- the Al foil of the present invention has a breaking strength of [0.2 ⁇ foil thickness ( ⁇ m)] N / 10 mm or more, preferably [0.25 ⁇ foil thickness ( ⁇ m)] N / 10 mm or more. is there.
- the breaking strength is 10 N / 10 mm or more.
- the breaking strength generally decreases as the foil thickness decreases, but in the present invention, the degree of decrease is small, and the same foil thickness shows a higher breaking strength than the conventional product.
- the Al foil of the present invention has a relatively high breaking strength of about 8 to 15 N / 10 mm at a thickness of 30 to 50 ⁇ m, but may have a higher breaking strength.
- the upper limit of the breaking strength is not limited, but is usually about 50 N / 10 mm when the foil thickness is 50 ⁇ m or less, and is usually about 25 N / 10 mm when the foil thickness is 25 ⁇ m or less.
- the value of [proof value / breaking strength] (ratio of yield value to breaking strength) in the Al foil of the present invention is 50% or more, preferably 70% or more.
- the proof stress value of the Al foil of the present invention (generally speaking, the tensile strength when the material is stretched by 0.2% when a tensile test is performed) is usually about 2 to 5 N / 10 mm when the foil thickness is in the range of 30 to 50 ⁇ m. However, cases exceeding this range are also encompassed by the present invention. In the present invention, by increasing such a high proof stress value and thus the ratio, it is possible to improve the handling property and suppress the occurrence of foil breakage or wrinkles.
- composition of the Al foil of the present invention is not limited as long as it has the above-mentioned characteristics, and a composition in a known Al foil can also be adopted.
- Fe 5 to 80 ppm by weight
- Si 5 to 100 ppm by weight
- Cu 10 to 100 ppm by weight
- Al and inevitable impurities can be suitably employed.
- the Fe content is usually about 5 to 80 ppm, preferably 10 to 50 ppm.
- Fe is an element that can be crystallized as an Al—Fe-based compound to improve rolling properties and elongation.
- an appropriate amount of the Al—Fe-based compound refines the crystal grains by crystal nucleation sites and pinning, and improves the rollability of the thin foil.
- the Fe content is less than 5 ppm, the above effect cannot be obtained, and the strength of the foil is reduced due to the coarsening of the crystal grains, and the strength of the penetrating foil is reduced and the strength varies depending on the part.
- the Fe content exceeds 80 ppm, excessive dissolution occurs on the surface, leading to a decrease in strength of the penetrating foil and a variation in strength due to the site. Further, the occupation ratio of the cube orientation is lowered, and a sufficient through etching pit density cannot be obtained.
- the Si content is usually about 5 to 100 ppm, preferably 10 to 60 ppm.
- Si is an element that can mainly improve the strength.
- an instantaneous temperature rise is caused not only on the surface of the aluminum penetrating foil but also on the inside, but dislocation disappears due to the presence of silicon. It can suppress and the fall of intensity
- the Si content is less than 5 ppm, the above effects cannot be obtained, and the strength is lowered, and the strength of the penetrating foil is easily reduced and the strength varies depending on the portion.
- the Si content exceeds 100 ppm, the occupation ratio of the cube orientation becomes low, and a sufficient through etching pit density cannot be obtained.
- the Cu content is usually about 10 to 100 ppm, preferably 15 to 60 ppm.
- the rollability when rolling to a foil thickness of 25 ⁇ m or less can be further improved.
- Cu also improves the solubility during hydrochloric acid etching and contributes to the formation of through-etching pits.
- the above effect cannot be obtained sufficiently, and the rollability of the thin foil is remarkably lowered.
- the content of Cu exceeds 100 ppm, excessive dissolution occurs on the surface, leading to a decrease in strength of the penetrating foil and a variation in strength due to the site. Further, the occupation ratio of the cube orientation is lowered, and a sufficient through etching pit density cannot be obtained.
- the Al foil of the present invention may contain Pb as necessary.
- Pb mainly promotes the reaction between the electrolytic solution used for the etching process and the aluminum foil and increases the initial number of etching pits, so that a higher penetration etching density can be achieved.
- the Pb content is usually about 0.01 to 20 ppm, preferably 0.05 to 10 ppm.
- Pb mainly promotes the reaction between the electrolytic solution used for the etching treatment and the aluminum foil and increases the initial number of etching pits, so that a higher penetration etching density can be achieved.
- the content of Pb in the case of containing Pb can be appropriately adjusted so as to achieve the above effects, but it is usually about 0.01 to 20 ppm, preferably 0.05 to 10 ppm.
- Pb in the Al foil of the present invention, it is desirable to set Pb to be in the range of 40 to 2000 ppm in the region from the surface of the aluminum foil to a depth of 0.1 ⁇ m.
- the penetration etching density can be further increased.
- Such adjustment of the Pb content can be carried out, for example, by adjusting the amount of Pb added to the molten aluminum in the production stage of the aluminum foil and further controlling the annealing temperature within a range of 450 ° C. or higher. .
- the balance is substantially made of Al and inevitable impurities.
- the aluminum purity in the aluminum alloy foil of the present invention is not particularly limited as long as it is within a range that can be used for a current collector.
- Inevitable impurities may include, for example, Mg, Mn, Zn, Ti, V, Ga, Cr, Zr, and B.
- the Al foil of Embodiment B can be produced as follows. That is, by the manufacturing method of the high strength aluminum penetration foil characterized by including the process (this invention process) which performs simultaneously a tension process and a bending process with respect to the aluminum penetration foil which has multiple through-holes from the foil surface to a back surface
- the Al foil of the present invention can be preferably produced.
- the aluminum penetrating foil (raw foil) can be prepared by a known method, but it is particularly preferable to prepare it according to the following method.
- an ingot is produced by preparing a molten raw material having the above composition and solidifying the molten metal.
- the homogenization temperature is 550 ° C. or lower.
- the ingot is hot rolled and cold rolled to obtain a thick foil of about 350 ⁇ m.
- the thickness of the thin foil after rolling is preferably 110 to 130% of the thickness of the final foil.
- the temperature of cold rolling itself can be implemented within the temperature range which does not exceed 120 degreeC.
- the thin foil rolling (at least the final rolling (that is, rolling for obtaining the final foil)) has an average roughness Ra of the rolling roll of 0.25 ⁇ m or less, particularly 0.20 ⁇ m or less, and further 0.18 ⁇ m or less. It is preferable that In this case, the average roughness Ra of the thin foil obtained is 0.25 ⁇ m or less, particularly 0.20 ⁇ m or less, and further 0.18 ⁇ m or less on the surface in contact with the rolling roll.
- a thin foil when a thin foil is obtained by rolling a thick foil, it is preferable to perform rolling while ensuring a surface that does not contact the rolling roll.
- By securing a surface that does not come into contact with the rolling roll it is possible to eliminate a factor that hinders the movement of crystal grains, and thereby a high cube orientation occupation ratio can be obtained even with a thin foil.
- the total thickness when the foils are overlapped is preferably 350 ⁇ m or less. Separation of the laminated foils can be carried out before and / or after the next step, annealing. Also in this combined rolling, it is preferable that the average roughness Ra of the rolling roll is 0.25 ⁇ m or less, particularly 0.20 ⁇ m or less, and further 0.18 ⁇ m or less.
- the heat treatment temperature is desirably 350 ° C. or lower.
- the atmosphere of the intermediate annealing is not limited, and may be any of, for example, vacuum, air, inert gas atmosphere, and the like.
- the thin foil is further cold-rolled to obtain a final foil having a desired foil thickness (a foil having a final foil thickness). That is, a foil having a thickness of 50 ⁇ m or less can be obtained by this cold rolling.
- the average roughness Ra of the rolling roll is preferably 0.25 ⁇ m or less, particularly 0.20 ⁇ m or less, and further preferably 0.18 ⁇ m or less.
- the foil may be washed for the purpose of removing rolling oil, impurities and oxide film on the foil surface, for example. You may dry suitably after washing
- high-temperature annealing is performed with excessively applied rolling oil, a part of the foil surface is yellowed in a spot shape, and etching pits having a desired shape may not be obtained even if etching is performed.
- the annealing temperature is not limited, it is usually 450 ° C. or higher, preferably 450 ° C. or higher and lower than 660 ° C., more preferably 500 to 620 ° C.
- the annealing temperature is lower than 450 ° C., the cube orientation ratio is lowered, and there is a possibility that etching pits having a desired shape cannot be obtained even if etching is performed.
- the annealing time is generally about 1 to 100 hours, although it depends on the annealing temperature.
- the annealing atmosphere is desirably substantially a vacuum or an inert gas atmosphere.
- the temperature exceeds 350 ° C. including the temperature raising and lowering steps, it is desirable to reduce the oxygen concentration in the annealing atmosphere as much as possible industrially. That is, it is desirable that the pressure be 10 ⁇ 5 Torr or less or an inert gas atmosphere containing 0 to 1% by volume of oxygen.
- an inert gas atmosphere in which the oxygen concentration in the vacuum atmosphere or annealing atmosphere exceeding 10 ⁇ 5 Torr exceeds 1.0% by volume, a part of the foil surface after annealing turns yellow into a spot shape, and etching treatment is performed.
- the through hole is formed by performing an etching process on the foil (final foil) thus obtained.
- the method for the etching treatment is not limited, and a desired through hole may be formed by one-stage etching, or may be performed in two stages or more.
- a desired through hole is suitably formed by forming at least two stages of etching and forming a through hole by the first stage etching and adjusting the inner diameter of the through hole by the second stage etching. Can do.
- the first-stage etching is preferably direct-current etching in an electrolyte containing hydrochloric acid as a main component.
- etching pits are mainly formed and the density and shape (through shape) can be controlled.
- the electrolytic solution an aqueous solution in which 1 to 10% by weight of hydrochloric acid is dissolved in water can be used. In this case, 0.001 to 0.1% by weight of oxalic acid, phosphoric acid, sulfuric acid or the like may be added to the electrolytic solution.
- the liquid temperature is about 60 to 90 ° C.
- the current density is about 0.1 to 0.5 A / cm 2 .
- the etching method is preferably direct current etching.
- the etching time can be appropriately set according to the foil thickness, the target air permeability, and the like.
- the etching pit diameter can be mainly controlled.
- chemical etching can be performed in a liquid having the same composition and temperature as the first-stage etching.
- the etching time can be appropriately set according to, for example, the foil thickness and the target air permeability.
- hydrochloric acid it is not always necessary to use hydrochloric acid as a main component, and it may be an electrolyte containing nitric acid as a main component.
- electrolytic etching instead of chemical etching.
- “second-stage etching” may be further multi-staged by combining chemical etching, electrolytic etching, and etching solution composition.
- the present invention processing is carried out. That is, a tensile process and a bending process are simultaneously performed on the raw foil.
- the foil thickness of the original foil may be changed somewhat after the processing of the present invention as long as the through-hole is substantially retained.
- the rate of change of the foil thickness is 5% or less, particularly 1% or less, Furthermore, it is preferable to set it as 0%. That is, it is most preferable to perform the tensile process and the bending process on the original foil at the same time while substantially maintaining the thickness of the original foil.
- the rate of change is controlled within the above range.
- the original foil extends the etching pits from the foil surface to the inside and penetrates to the opposite surface. Therefore, the aluminum foil is heat-treated (annealed) and completely recrystallized before etching, and preferably one recrystallized grain has a cross section of the foil. It is necessary to penetrate.
- the strength of the aluminum foil is remarkably lowered, and the handleability when processed into a thin foil is deteriorated.
- the yield strength value can be increased, the handling property can be improved, and foil breakage and wrinkle generation can be suppressed.
- the fracture strength of the aluminum foil before etching is about 50 N / mm 2 or less, and the proof stress value is about 20 N / mm 2 or less.
- improvement in strength by adding (alloying) elements such as Fe, Si, Cu, etc. can be considered, but these elements cannot be added in large amounts because they hinder etching properties, and in fact, Above, it is difficult to improve the strength by alloying.
- the strength can be improved without affecting the air permeability or the like by applying a slight processing to the original foil after etching. That is, the proof stress value can be increased by simultaneously performing a light pulling process and a bending process and introducing a processing strain. Since the handleability of the thin foil is almost determined by this yield strength value, the handleability can be improved by increasing the yield strength value.
- the method of performing the tensile process and the bending process at the same time is not particularly limited, and a known processing method (processing apparatus) can be used alone or in combination.
- a known processing method processing apparatus
- the process by a press apparatus, the process by a rolling apparatus, the process by a stretcher, etc. can be mentioned.
- the processing level may be adjusted while monitoring the foil thickness of the original foil. In this case, since the desired air permeability cannot be obtained when the strength is processed, it is preferable to adjust at a light level.
- a known or commercially available tension leveler can be used.
- FIG. 6 there is an apparatus in which straightening rollers 23 a to 23 i for performing tension straightening and bending straightening are arranged between a roller 21 winding a raw foil 20 and a winding roller 22.
- the winding roller is a driving roller.
- the number of rollers for correction, the diameter of each roller, the position (level difference, horizontal spacing), etc. can be adjusted as appropriate.
- the unit tension of the tension leveler that is, the tension in the take-up roller 22 and the rewind roller 21
- predetermined characteristics can be imparted.
- the unit tension can be appropriately changed depending on the properties of the original foil to be used (foil thickness, air permeability, etc.), desired proof stress value, etc., but is usually within a range of 1 to 20 N / 10 mm.
- Example according to Embodiment 1> The measuring method of each physical property was implemented as follows.
- Air permeability It measured by the air permeability test method by the Gurley type densometer according to JISP8117.
- the part where the measurement length of each sample is 100 mm in the dimension of the photograph is selected as shown in FIG. 1, and the angle measurement as shown in FIG.
- a transparent card for use is superimposed on the above photo, and the number of through holes with an angle within the range of 70 to 110 degrees (90 ⁇ 20 degrees) from the lower surface is measured, and the total number of all through holes is visually observed.
- the ratio to the total number is calculated as the vertical through-hole occupation ratio (%).
- the vertical through-hole occupation rate after embossing can be similarly calculated by adjusting so that the part which is not embossed may become an observation surface.
- embossed foil thickness and embossing depth The embossed foil thickness was measured with a thickness measuring machine having a flat surface and a micrometer of ⁇ 5 mm or more. Further, the value of (embossed foil thickness-foil thickness before embossing) was defined as the embossing depth.
- FIG. 5 shows a slurry (solid content concentration 30%) obtained by kneading an active material containing 90% by mass of activated carbon having a specific surface area of 2000 m 2 / g and an average particle diameter of 6 ⁇ m and 10% by mass of PTFE (polytetrafluoroethylene) with ethanol.
- PTFE polytetrafluoroethylene
- Production Example 1-1 After preparing a molten metal having a composition comprising Fe: 18 ppm by weight, Si: 20 ppm by weight, Cu: 25 ppm, the balance: Al and inevitable impurities, an ingot was obtained by solidifying the molten metal. Subsequently, the ingot was homogenized at 500 ° C. for 10 hours. Thereafter, the ingot was rolled to a thickness of 65 ⁇ m by hot rolling (temperature 400 ° C.) and cold rolling. After performing an intermediate annealing at 250 ° C. for 8 hours, a foil having a thickness of 50 ⁇ m was obtained by further cold rolling.
- an organic solvent-based cleaning agent isopropylene
- annealing was performed in argon gas at 500 ° C. for 10 hours.
- an aqueous solution containing 5% by weight of hydrochloric acid as an electrolytic solution, by performing direct current etching at a liquid temperature of 70 ° C. and a current density of 0.3 A / cm 2 , an aluminum through foil having a large number of through pits (through holes) is obtained. It was.
- the obtained aluminum penetration foil had a foil thickness: 50 ⁇ m, a breaking strength: 13.2 N / 10 mm, a breaking elongation of 1.7%, and an air permeability: 42 sec / 100 ml.
- Production Example 1-2 A foil having a thickness of 30 ⁇ m, a breaking strength of 8.3 N / 10 mm, a breaking elongation of 1.2%, and an air permeability of 36 sec / 100 ml was produced in the same manner as in Production Example 1-1 as an aluminum through foil before embossing. did.
- Example 1-1 The aluminum penetration foil obtained in Production Example 1-1 was used as an original foil, and this was embossed with a commercially available embossing machine. As shown in FIG. 3, embossing was performed by passing an Al foil 31 as an original foil between the upper roll 32 and the lower roll 33.
- the embossing conditions were as follows: an embossed pattern metal silk roll (100 mesh, trapezoidal cup, cup depth 15 ⁇ m) as the upper roll 32, and a resin roll (no embossing) as the lower roll 33, and a pressure of 10 kg / cm 2. And a roll speed of 20 m / min.
- Table 1 shows the results of determination of the wrinkle occurrence when coating the foil thickness, breaking strength, breaking elongation, air permeability, active material of the embossed Al foil, and Table 2 shows the vertical through-hole occupancy ratio. Show.
- Example 1-2 An embossed Al foil was obtained in the same manner as in Example 1-1 except that a metal silk roll (150 mesh, trapezoidal cup, cup depth 20 ⁇ m) was used as the upper roll. The resulting Al foil was measured for breaking strength and the like in the same manner as in Example 1-1. The results are shown in Tables 1 and 2.
- Example 1-3 An embossed Al foil was obtained in the same manner as in Example 1-1 except that the aluminum penetrating foil obtained in Production Example 1-2 was used as the raw foil. The resulting Al foil was measured for breaking strength and the like in the same manner as in Example 1-1. The results are shown in Tables 1 and 2.
- Example 1-4 An embossed Al foil was obtained in the same manner as in Example 1-3, except that a metal silk roll (150 mesh, trapezoidal cup, cup depth 20 ⁇ m) was used as the upper roll. The obtained Al foil was measured for breaking strength and the like in the same manner as in Example 1-3. The results are shown in Tables 1 and 2.
- Comparative Example 1-1 With respect to the aluminum penetration foil of Production Example 1-1, the physical properties when not embossed were examined in the same manner as in Example 1-1. The results are shown in Tables 1 and 2.
- Comparative Example 1-2 With respect to the aluminum penetration foil of Production Example 1-2, the physical properties when not embossed were examined in the same manner as in Example 1-1. The results are shown in Tables 1 and 2.
- the embossed Al foil having the predetermined physical properties of the present invention does not generate wrinkles and is suitable as a current collector or the like.
- Example according to Embodiment 2> The measuring method of each physical property was implemented as follows.
- FIG. 5 shows a slurry (solid content concentration 30%) in which an active material containing 90% by mass of activated carbon having a specific surface area of 2000 m 2 / g and an average particle size of 6 ⁇ m and 10% by mass of PTFE (polytetrafluoroethylene) is kneaded with ethanol.
- PTFE polytetrafluoroethylene
- the part where the measurement length of each sample is 100 mm in the dimension of the photograph is selected as shown in FIG. 1, and the angle measurement as shown in FIG.
- the transparent card for use is superimposed on the above photo, and the number of through holes with an angle in the range of 70 to 110 ° (90 ⁇ 20 °) from the lower surface is measured, and the total number of all through holes is visually observed. After counting, the ratio to the total number is calculated as the vertical through-hole occupation ratio (%).
- Example 2-1 After preparing a molten metal having a composition comprising Fe: 18 ppm by weight, Si: 20 ppm by weight, Cu: 25 ppm, the balance: Al and inevitable impurities, an ingot was obtained by solidifying the molten metal. Subsequently, the ingot was homogenized at 500 ° C. for 10 hours. Thereafter, the ingot was rolled to a thickness of 65 ⁇ m by hot rolling (temperature 400 ° C.) and cold rolling. After performing an intermediate annealing at 250 ° C. for 8 hours, a foil having a thickness of 50 ⁇ m was obtained by further cold rolling.
- an organic solvent-based cleaning agent isopropylene
- annealing was performed in argon gas at 500 ° C. for 10 hours.
- an aqueous solution containing 5% by weight of hydrochloric acid as an electrolytic solution, by performing direct current etching at a liquid temperature of 70 ° C. and a current density of 0.3 A / cm 2 , an aluminum through foil having a large number of through pits (through holes) is obtained. It was.
- the obtained aluminum penetration foil had a foil thickness of 50 ⁇ m, a proof stress value of 3.5 N / 10 mm, a breaking strength of 13.2 N / 10 mm, and an air permeability of 42 sec / 100 ml.
- the aluminum penetrating foil was used as a raw foil, and this was processed by a tension leveler.
- As the tension leveler as shown in FIG. 6, nine rolls are alternately arranged in the vertical direction, and each roll has a diameter of 50 mm.
- the unit tension was 5 N / 10 mm.
- Table 3 shows the thickness of the Al foil that has been processed, the value of [proof strength / breaking strength], air permeability, and the determination result of wrinkle generation when an active material is applied. Is shown in Table 4.
- Example 2-2 An Al foil was produced in the same manner as in Example 2-1, except that the unit tension was changed to 8 N / 10 mm during processing with the tension leveler.
- Table 3 shows the foil thickness of the Al foil subjected to the processing, the value of [proof strength / breaking strength], the air permeability, and the wrinkle generation determination result, and the vertical through-hole occupation ratio and the like are shown in Table 4.
- Example 2-3 In the same manner as in Example 2-1, an aluminum penetrating foil (raw foil) having a foil thickness of 30 ⁇ m was produced. This foil had a proof stress value: 2.2 N / 10 mm, a breaking strength: 8.2 N / 10 mm, and an air permeability: 36 sec / 100 ml.
- an Al foil was produced in the same manner as in Example 2-1, except that the unit tension was changed to 3 N / 10 mm when processing with a tension leveler.
- Table 3 shows the foil thickness of the Al foil subjected to the processing, the value of [proof strength / breaking strength], the air permeability, and the wrinkle generation determination result, and the vertical through-hole occupation ratio and the like are shown in Table 4.
- Example 2-4 An Al foil was produced in the same manner as in Example 2-3, except that the unit tension was changed to 5 N / 10 mm during processing by the tension leveler.
- Table 3 shows the foil thickness of the Al foil subjected to the processing, the value of [proof strength / breaking strength], the air permeability, and the wrinkle generation determination result, and the vertical through-hole occupation ratio and the like are shown in Table 4.
- Example 2-5 In the same manner as in Example 2-1, an aluminum penetrating foil (raw foil) having a foil thickness of 20 ⁇ m was produced. This foil had a proof stress value: 2.1 N / 10 mm, a breaking strength: 7.0 N / 10 mm, and an air permeability: 65 sec / 100 ml. Using this original foil, an Al foil was produced in the same manner as in Example 2-1, except that the unit tension was changed to 3 N / 10 mm when processing with a tension leveler. Table 3 shows the foil thickness of the Al foil subjected to the processing, the value of [proof strength / breaking strength], the air permeability, and the wrinkle generation determination result, and the vertical through-hole occupation ratio and the like are shown in Table 4.
- Example 2-6 An Al foil was produced in the same manner as in Example 2-5, except that the unit tension was changed to 5 N / 10 mm during processing with the tension leveler.
- Table 3 shows the foil thickness of the Al foil subjected to the processing, the value of [proof strength / breaking strength], the air permeability, and the wrinkle generation determination result, and the vertical through-hole occupation ratio and the like are shown in Table 4.
- Comparative Example 2-2 About the raw foils in Examples 2-3 and 2-4, the foil thickness of the Al foil, the value of [proof strength / breaking strength], the air permeability, and the determination result of wrinkle generation for those not processed by the tension leveler Is shown in Table 3, and the vertical through-hole occupation ratio and the like are shown in Table 4.
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Abstract
Description
1. 箔表面から裏面に至る貫通孔を複数有するアルミニウム貫通箔であって、
(1)箔厚みが50μm以下であり、
(2)破断強度が[0.2×箔厚み(μm)]N/10mm以上である、
ことを特徴とする高強度アルミニウム貫通箔。
2. 破断強度が[0.3×箔厚み(μm)]N/10mm以上である、前記項1に記載の高強度アルミニウム貫通箔。
3. 破断伸びが[0.05×箔厚み(μm)]%以下である、前記項1に記載の高強度アルミニウム貫通箔。
4. 貫通孔の密度が1×104個/cm2以上である、前記項1に記載の高強度アルミニウム貫通箔。
5. [耐力値/破断強度]が50%以上である、前記項1に記載の高強度アルミニウム貫通箔。
6. JIS P 8117に準じたガーレ式デンソメータによる透気度試験方法によって測定された透気度が5sec/100ml以上である、前記項1に記載の高強度アルミニウム貫通箔。
7. 貫通孔の平均内径が0.2~5μmである、前記項1に記載の高強度アルミニウム貫通箔。
8. 表面積拡大比が、[0.10×箔厚み(μm)]以上の値である、前記項1に記載の高強度アルミニウム貫通箔。
9. Fe:5~80重量ppm、Si:5~100重量ppm、Cu:10~100重量ppmならびに残部:Al及び不可避不純物からなる組成を有する、前記項1に記載の高強度アルミニウム貫通箔。
10. アルミニウム貫通箔における垂直貫通孔占有率c(%)と前記箔厚みt(μm)の比率[c/t]が1.4以上である、前記項1に記載の高強度アルミニウム貫通箔。
11. 前記項1に記載の高強度アルミニウム貫通箔の製造方法であって、箔表面から裏面に至る貫通孔を複数有するアルミニウム貫通箔に対し、エンボス加工を行う工程を含むことを特徴とする高強度アルミニウム貫通箔の製造方法。
12. 前記項1に記載の高強度アルミニウム貫通箔の製造方法であって、箔表面から裏面に至る貫通孔を複数有するアルミニウム貫通箔に対し、引張加工と曲げ加工とを同時に行う工程を含むことを特徴とする高強度アルミニウム貫通箔の製造方法。
(1)箔厚みが50μm以下であり、
(2)破断強度が[0.2×箔厚み(μm)]N/10mm以上である、
ことを特徴とする。
(A-1)実施形態1に係るAl箔
実施形態1に係るAl箔は、箔表面から裏面に至る貫通孔を複数有するアルミニウム貫通箔であって、
(1)箔厚みが50μm以下であり、
(2)破断強度が[0.3×箔厚み(μm)]N/10mm以上であり、
(3)破断伸びが[0.05×箔厚み(μm)]%以下である、
ことを特徴とする。
貫通孔の内径は、Al箔の用途、使用目的等に応じて適宜設定することができるが、通常は0.2~5μm、特に0.5~3μmとすることが好ましい。貫通孔の内径は、エッチング処理時において特にエッチング時間を調整することにより適宜制御することができる。
本発明Al箔の厚みは、通常は50μm以下、好ましくは40μm以下、さらに好ましくは25μm以下とする。上記の厚みに設定することにより、リチウムイオンキャパシタの集電体として好適に用いることができる。なお、厚みの下限値は限定的ではないが、通常は1μm程度とすれば良い。なお、本発明における「箔厚み」とは、後述のエンボス加工が施されていない部分の厚みを指す。
本発明のエンボス箔厚みは、通常は95μm以下、好ましくは90μm以下とする。上記の厚みに設定することにより、リチウムイオンキャパシタの集電体として好適に用いることができる。なお、厚みの下限値は限定的ではないが、通常は1.3μm程度とすれば良い。なお、本発明における「エンボス箔厚み」とは、図4に示すように、エンボス加工されたAl箔31におけるエンボス形状の高さ(深さ)を含めた総厚みtを指す。
本発明Al箔は、破断強度が[0.3×箔厚み(μm)]N/10mm以上であり、好ましくは[0.35×箔厚み(μm)]N/10mm以上である。例えば、箔厚みが50μmの本発明Al箔では、破断強度は15N/10mm以上である。破断強度は、一般的には箔厚みの減少とともに低下するが、本発明ではその低下度合いが小さく、同じ箔厚みでは従来品に比して高い破断強度を示す。本発明Al箔では、厚み30~50μmでは破断強度は8~15N/10mm程度と比較的高強度であるが、それ以上の高い破断強度であっても良い。なお、破断強度の上限値は限定的ではないが、箔厚み50μm以下の範囲であれば通常は50N/10mm程度、箔厚み25μm以下の範囲であれば通常は25N/10mm程度とすれば良い。
本発明Al箔の組成は、上記の特性を有する限りは制限されず、公知のAl箔における組成を採用することもできるが、特にFe:5~80重量ppm、Si:5~100重量ppm、Cu:10~100重量ppmならびに残部:Al及び不可避不純物からなる組成を好適に採用することができる。
実施形態1のAl箔は、次のようにして製造することができる。すなわち、箔表面から裏面に至る貫通孔を複数有するアルミニウム貫通箔に対し、エンボス加工を行う(本発明加工)工程を含むことを特徴とする高強度アルミニウム貫通箔の製造方法により、実施形態1に係るAl箔を好適に製造することができる。
(B-1)実施形態2に係るAl箔
実施形態2の高強度アルミニウム貫通箔(本発明Al箔)は、箔表面から裏面に至る貫通孔を複数有するアルミニウム貫通箔であって、
(1)箔厚みが50μm以下であり、
(2)破断強度が[0.2×箔厚み(μm)]N/10mm以上であり、
(3)[耐力値/破断強度]が50%以上である、
ことを特徴とする。
貫通孔の内径は、Al箔の用途、使用目的等に応じて適宜設定することができるが、通常は0.2~5μm、特に0.5~3μmとすることが好ましい。貫通孔の内径は、エッチング処理時において特にエッチング時間を調整することにより適宜制御することができる。
本発明Al箔は、破断強度が[0.2×箔厚み(μm)]N/10mm以上であり、好ましくは[0.25×箔厚み(μm)]N/10mm以上である。例えば、箔厚みが50μmの本発明Al箔では、破断強度は10N/10mm以上である。破断強度は、一般的には箔厚みの減少とともに低下するが、本発明ではその低下度合いが小さく、同じ箔厚みでは従来品に比して高い破断強度を示す。本発明Al箔では、厚み30~50μmでは破断強度は8~15N/10mm程度と比較的高強度であるが、それ以上の高い破断強度であっても良い。なお、破断強度の上限値は限定的ではないが、箔厚み50μm以下の範囲であれば通常は50N/10mm程度、箔厚み25μm以下の範囲であれば通常は25N/10mm程度である。
本発明Al箔の組成は、上記の特性を有する限りは制限されず、公知のAl箔における組成を採用することもできるが、特にFe:5~80重量ppm、Si:5~100重量ppm、Cu:10~100重量ppmならびに残部:Al及び不可避不純物からなる組成を好適に採用することができる。
実施形態BのAl箔は、次のようにして製造することができる。すなわち、箔表面から裏面に至る貫通孔を複数有するアルミニウム貫通箔に対し、引張加工と曲げ加工とを同時に行う(本発明加工)工程を含むことを特徴とする高強度アルミニウム貫通箔の製造方法により、本発明Al箔を好適に製造することができる。
各物性の測定方法は、次のようにして実施した。
破断強度については、JIS B 7721に準じた引張試験機により引張試験を行なった。10mm巾で長さ150mmの試料を、チャック間距離が50mmとなるように固定し、引張速度10mm/minで10回測定し、その平均値を求めた。
破断伸びについては、上記(1)の破断強度試験において破断したときの伸びを求めた。
JIS P 8117に準じたガーレ式デンソメータによる透気度試験方法によって測定した。
エッチング処理後のアルミニウム貫通箔のLT-ST面(圧延方向に垂直な断面)が観察面となるようにサンプル(10mm幅)をエポキシ樹脂に埋め込み、試料をバフ研磨(ダイヤモンド研磨)する。その後、アルミニウム部分を電解(電解条件:エタノール:過塩素酸=4:1の溶液にて、0℃、定電圧(20V)電解×180秒)にて溶解し、エッチングピット(エッチングピットに入り込んだ樹脂部分)を走査型電子顕微鏡(SEM)にて観察する。そして、無作為に撮影した10視野(倍率500倍)の写真から、図1に示すように各試料の測定長さが写真の寸法で100mmとなる部位を選び、図2に示すような角度測定用透明カードを上記写真に重ね合わせ、下表面から70~110度(90±20度)の範囲内の角度をもった貫通孔の数を計測し、全体の貫通孔の合計数を目視にてカウントした後、その合計数に対する割合を垂直貫通孔占有率(%)として算出する。
なお、エンボス加工後の垂直貫通孔占有率は、エンボス加工が施されていない部分が観察面となるように調整することにより、同様に算出することができる。
倍率を5000倍としたほかは前記(4)と同様の方法にて無作為に10視野の写真を撮影し、各試料の測定面積が写真の寸法で100mm×100mmの範囲を画像解析してエッチングピット数及び総エッチングピット面積を計測し、貫通孔を円形と仮定して貫通孔の内径を算出する。画像解析装置としては、多目的高速画像解析装置「PCA11」(システムサイエンス株式会社製)を用いた。
エッチング処理後のアルミニウム貫通箔を60℃の陽極酸化処理液(5%アジピン酸アンモニウム溶液)に浸漬し、10Vで陽極酸化処理することにより陽極酸化皮膜を形成させた後、LCRメータを用いて静電容量を測定し、エッチング前のアルミニウム箔の静電容量比から算出する。測定投影面積は、5cm×10cmとした。
前記(5)と同様に画像解析してエッチングピット数を計測し、貫通孔の密度を算出する。画像解析装置としては、多目的高速画像解析装置「PCA11」(システムサイエンス株式会社製)を用いた。
エンボス箔厚みは、表面が平らな厚み測定機、φ5mm以上のマイクロメーターで測定した。また、(エンボス箔厚み-エンボス加工前の箔厚み)の値をエンボス加工深さとした。
活物質を塗工した際のシワの発生を次のように判定した。比表面積2000m2/g及び平均粒径6μmの活性炭90質量%及びPTFE(ポリテトラフルオロエチレン)10質量%を含む活物質をエタノールで混練したスラリー(固形分濃度30%)を、図5に示すようにサポートロール(図5の2個のローラー)の間隔が2mの両面ダイコーターにより、乾燥後の塗布厚みが片面70μmとなるように塗工した。塗工速度は3m/分とし、出側のサポートロール付近でのシワの発生を目視観察した。35分間(約100m)観察し、シワの発生が全く認められなかったものを「○」、一度でも認められたものを「△」、頻繁に認められたものを「×」として評価した。
Fe:18重量ppm、Si:20重量ppm、Cu:25ppm、残部:Al及び不可避不純物からなる組成を有する溶湯を調製した後、溶湯を凝固させることにより鋳塊を得た。次いで、前記鋳塊を500℃で10時間の均質化処理を施した。その後、前記鋳塊に対して熱間圧延(温度400℃)及び冷間圧延を施すことによって厚さ65μmまで圧延した。250℃で8時間の中間焼鈍を施した後、さらに冷間圧延を施すことによって厚さ50μmの箔を得た。有機溶剤系洗浄剤(イソプロピレン)で洗浄した後、アルゴンガス中500℃で10時間の焼鈍を実施した。次いで、塩酸5重量%を含む水溶液を電解液として用い、液温70℃及び電流密度0.3A/cm2で直流エッチングを行うことにより、貫通ピット(貫通孔)を多数有するアルミニウム貫通箔を得た。得られたアルミニウム貫通箔は、箔厚み:50μm、破断強度:13.2N/10mm、破断伸び1.7%、透気度:42sec/100mlであった。
エンボス加工前のアルミニウム貫通箔として、箔厚み:30μm、破断強度:8.3N/10mm、破断伸び1.2%、透気度:36sec/100mlの箔を製造例1-1と同様にして製造した。
製造例1-1で得られたアルミニウム貫通箔を原箔として用い、これを市販のエンボス加工機によりエンボス加工を行った。図3に示すように、上ロール32及び下ロール33の間に、原箔となるAl箔31を通過させることによりエンボス加工を実施した。エンボス加工の条件は、上ロール32としてエンボスパターン入り金属製絹目ロール(100メッシュ、台形カップ、カップ深さ15μm)、下ロール33として樹脂製ロール(エンボスなし)を用い、圧力10kg/cm2とロール速度20m/分とした。エンボス加工が施されたAl箔の箔厚み、破断強度、破断伸び、透気度、活物質を塗工した際のシワ発生判定結果を表1に示し、垂直貫通孔占有率等を表2に示す。
上ロールとして金属製絹目ロール(150メッシュ、台形カップ、カップ深さ20μm)を用いたほかは、実施例1-1と同様にしてエンボス加工が施されたAl箔を得た。得られたAl箔を実施例1-1と同様にして破断強度等を測定した。その結果を表1及び表2に示す。
原箔として製造例1-2で得られたアルミニウム貫通箔を用いたほかは、実施例1-1と同様にしてエンボス加工が施されたAl箔を得た。得られたAl箔を実施例1-1と同様にして破断強度等を測定した。その結果を表1及び表2に示す。
上ロールとして金属製絹目ロール(150メッシュ、台形カップ、カップ深さ20μm)を用いたほかは、実施例1-3と同様にしてエンボス加工が施されたAl箔を得た。得られたAl箔を実施例1-3と同様にして破断強度等を測定した。その結果を表1及び表2に示す。
製造例1-1のアルミニウム貫通箔について、エンボス加工しない場合の物性を実施例1-1と同様にして調べた。その結果を表1及び表2に示す。
製造例1-2のアルミニウム貫通箔について、エンボス加工しない場合の物性を実施例1-1と同様にして調べた。その結果を表1及び表2に示す。
各物性の測定方法は、次のようにして実施した。
JIS B 7721に準じた引張試験機により引張試験を行なった。10mm巾で長さ150mmの試料を、チャック間距離が50mmとなるように固定し、引張速度10mm/minで10回測定し、その平均値を求めた。0.2%伸びの強度を耐力値とし、破断時の強度を破断強度とした。
JIS P 8117に準じたガーレ式デンソメータによる透気度試験方法によって測定する。
活物質を塗工した際のシワの発生を次のように判定した。比表面積2000m2/g平均粒径6μmの活性炭を90質量%及びPTFE(ポリテトラフルオロエチレン)を10質量%含む活物質をエタノールで混練したスラリー(固形分濃度30%)を、図5に示すようにサポートロール(図5の2個のローラー)の間隔が2mの両面ダイコーターにより、乾燥後の塗布厚みが片面70μmとなるように塗工した。塗工速度は3m/分とし、出側のサポートロール付近でのシワの発生を目視観察した。35分間(約100m)観察し、シワの発生が全く認められなかったものを「○」、一度でも認められたものを「△」、頻繁に認められたものを「×」として評価した。
エッチング処理後のアルミニウム貫通箔のLT-ST面(圧延方向に垂直な断面)が観察面となるようにサンプル(10mm幅)をエポキシ樹脂に埋め込み、試料をバフ研磨(ダイヤモンド研磨)する。その後、アルミニウム部分を電解(電解条件:エタノール:過塩素酸=4:1の溶液にて、0℃、定電圧(20V)電解×180秒)にて溶解し、エッチングピット(エッチングピットに入り込んだ樹脂部分)を走査型電子顕微鏡(SEM)にて観察する。そして、無作為に撮影した10視野(倍率500倍)の写真から、図1に示すように各試料の測定長さが写真の寸法で100mmとなる部位を選び、図2に示すような角度測定用透明カードを上記写真に重ね合わせ、下表面から70~110°(90±20°)の範囲内の角度をもった貫通孔の数を計測し、全体の貫通孔の合計数を目視にてカウントした後、その合計数に対する割合を垂直貫通孔占有率(%)として算出する。
倍率を5000倍としたほかは前記(1)と同様の方法にて無作為に10視野の写真を撮影し、各試料の測定面積が写真の寸法で100mm×100mmの範囲を画像解析してエッチングピット数及び総エッチングピット面積を計測し、貫通孔を円形と仮定して貫通孔の内径を算出する。画像解析装置としては、多目的高速画像解析装置「PCA11」(システムサイエンス株式会社製)を用いた。
エッチング処理後のアルミニウム貫通箔を60℃の陽極酸化処理液(5%アジピン酸アンモニウム溶液)に浸漬し、10Vで陽極酸化処理することにより陽極酸化皮膜を形成させた後、LCRメータを用いて静電容量を測定し、エッチング前のアルミニウム箔の静電容量比から算出する。測定投影面積は、5cm×10cmとした。
貫通孔率s(%)=[(100×測定重量(g))/(箔厚み(cm)×試料面積(cm2))]/(アルミニウムの比重(2.70g/cm3))を求めた。前記「箔厚み」は、試料4隅と中央部の計5点をマイクロメーターで測定した平均値とする。前記「試料面積」は10cm×5cmとする。前記「測定重量」は試料を電子天秤で秤量した値とする。
Fe:18重量ppm、Si:20重量ppm、Cu:25ppm、残部:Al及び不可避不純物からなる組成を有する溶湯を調製した後、溶湯を凝固させることにより鋳塊を得た。次いで、前記鋳塊を500℃で10時間の均質化処理を施した。その後、前記鋳塊に対して熱間圧延(温度400℃)及び冷間圧延を施すことによって厚さ65μmまで圧延した。250℃で8時間の中間焼鈍を施した後、さらに冷間圧延を施すことによって厚さ50μmの箔を得た。有機溶剤系洗浄剤(イソプロピレン)で洗浄した後、アルゴンガス中で500℃で10時間の焼鈍をした。次いで、塩酸5重量%を含む水溶液を電解液として用い、液温70℃及び電流密度0.3A/cm2で直流エッチングを行うことにより、貫通ピット(貫通孔)を多数有するアルミニウム貫通箔を得た。得られたアルミニウム貫通箔は、箔厚み:50μm、耐力値:3.5N/10mm、破断強度:13.2N/10mm、透気度:42sec/100mlであった。
テンションレベラーにより加工に際してユニット張力を8N/10mmとしたほかは、実施例2-1と同様にしてAl箔を製造した。加工処理が施されたAl箔の箔厚み、[耐力値/破断強度]の値、透気度及びシワ発生判定結果を表3に示し、垂直貫通孔占有率等を表4に示す。
実施例2-1と同様にして箔厚み30μmのアルミニウム貫通箔(原箔)を作製した。この箔は、耐力値:2.2N/10mm、破断強度:8.2N/10mm、透気度:36sec/100mlであった。この原箔を用いて、テンションレベラーにより加工に際してユニット張力を3N/10mmとしたほかは、実施例2-1と同様にしてAl箔を製造した。加工処理が施されたAl箔の箔厚み、[耐力値/破断強度]の値、透気度及びシワ発生判定結果を表3に示し、垂直貫通孔占有率等を表4に示す。
テンションレベラーにより加工に際してユニット張力を5N/10mmとしたほかは、実施例2-3と同様にしてAl箔を製造した。加工処理が施されたAl箔の箔厚み、[耐力値/破断強度]の値、透気度及びシワ発生判定結果を表3に示し、垂直貫通孔占有率等を表4に示す。
実施例2-1と同様にして箔厚み20μmのアルミニウム貫通箔(原箔)を作製した。この箔は、耐力値:2.1N/10mm、破断強度:7.0N/10mm、透気度:65sec/100mlであった。この原箔を用いて、テンションレベラーにより加工に際してユニット張力を3N/10mmとしたほかは、実施例2-1と同様にしてAl箔を製造した。加工処理が施されたAl箔の箔厚み、[耐力値/破断強度]の値、透気度及びシワ発生判定結果を表3に示し、垂直貫通孔占有率等を表4に示す。
テンションレベラーにより加工に際してユニット張力を5N/10mmとしたほかは、実施例2-5と同様にしてAl箔を製造した。加工処理が施されたAl箔の箔厚み、[耐力値/破断強度]の値、透気度及びシワ発生判定結果を表3に示し、垂直貫通孔占有率等を表4に示す。
実施例2-1及び2-2における原箔について、テンションレベラーにより加工を実施しなかったものについてのAl箔の箔厚み、[耐力値/破断強度]の値、透気度及びシワ発生判定結果を表3に示し、垂直貫通孔占有率等を表4に示す。
実施例2-3及び2-4における原箔について、テンションレベラーにより加工を実施しなかったものについてのAl箔の箔厚み、[耐力値/破断強度]の値、透気度及びシワ発生判定結果を表3に示し、垂直貫通孔占有率等を表4に示す。
実施例2-5及び2-6における原箔について、テンションレベラーにより加工を実施しなかったものについてのAl箔の箔厚み、[耐力値/破断強度]の値、透気度及びシワ発生判定結果を表3に示し、垂直貫通孔占有率等を表4に示す。
Claims (12)
- 箔表面から裏面に至る貫通孔を複数有するアルミニウム貫通箔であって、
(1)箔厚みが50μm以下であり、
(2)破断強度が[0.2×箔厚み(μm)]N/10mm以上である、
ことを特徴とする高強度アルミニウム貫通箔。 - 破断強度が[0.3×箔厚み(μm)]N/10mm以上である、請求項1に記載の高強度アルミニウム貫通箔。
- 破断伸びが[0.05×箔厚み(μm)]%以下である、請求項1に記載の高強度アルミニウム貫通箔。
- 貫通孔の密度が1×104個/cm2以上である、請求項1に記載の高強度アルミニウム貫通箔。
- [耐力値/破断強度]が50%以上である、請求項1に記載の高強度アルミニウム貫通箔。
- JIS P 8117に準じたガーレ式デンソメータによる透気度試験方法によって測定された透気度が5sec/100ml以上である、請求項1に記載の高強度アルミニウム貫通箔。
- 貫通孔の平均内径が0.2~5μmである、請求項1に記載の高強度アルミニウム貫通箔。
- 表面積拡大比が、[0.10×箔厚み(μm)]以上の値である、請求項1に記載の高強度アルミニウム貫通箔。
- Fe:5~80重量ppm、Si:5~100重量ppm、Cu:10~100重量ppmならびに残部:Al及び不可避不純物からなる組成を有する、請求項1に記載の高強度アルミニウム貫通箔。
- アルミニウム貫通箔における垂直貫通孔占有率c(%)と前記箔厚みt(μm)の比率[c/t]が1.4以上である、請求項1に記載の高強度アルミニウム貫通箔。
- 請求項1に記載の高強度アルミニウム貫通箔の製造方法であって、箔表面から裏面に至る貫通孔を複数有するアルミニウム貫通箔に対し、エンボス加工を行う工程を含むことを特徴とする高強度アルミニウム貫通箔の製造方法。
- 請求項1に記載の高強度アルミニウム貫通箔の製造方法であって、箔表面から裏面に至る貫通孔を複数有するアルミニウム貫通箔に対し、引張加工と曲げ加工とを同時に行う工程を含むことを特徴とする高強度アルミニウム貫通箔の製造方法。
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| CN201080043277.2A CN102575322B (zh) | 2009-09-30 | 2010-09-22 | 铝贯通箔及其制造方法 |
| KR1020127006861A KR101736042B1 (ko) | 2009-09-30 | 2010-09-22 | 알루미늄 관통박 및 그 제조방법 |
| US13/499,130 US9331339B2 (en) | 2009-09-30 | 2010-09-22 | Perforated aluminium foil and manufacturing method thereof |
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| JP2010-078849 | 2010-03-30 | ||
| JP2010078849A JP5663184B2 (ja) | 2010-03-30 | 2010-03-30 | アルミニウム貫通箔及びその製造方法 |
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| KR (1) | KR101736042B1 (ja) |
| CN (1) | CN102575322B (ja) |
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Cited By (1)
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| CN103563028A (zh) * | 2011-05-26 | 2014-02-05 | 东洋铝株式会社 | 用于铝电解电容器的电极材料及其制造方法 |
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Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS63145757A (ja) * | 1987-10-15 | 1988-06-17 | Toyo Alum Kk | 軟質アルミニウム箔の製造方法 |
| JPH06306520A (ja) * | 1993-04-20 | 1994-11-01 | Nippon Foil Mfg Co Ltd | 軟質アルミ箔およびその製造方法 |
| JPH08260117A (ja) * | 1995-03-23 | 1996-10-08 | Furukawa Electric Co Ltd:The | 電解コンデンサ陰極用アルミニウム合金箔地の製造方法 |
| JPH10189396A (ja) * | 1996-12-26 | 1998-07-21 | Nippon Light Metal Co Ltd | 電解コンデンサ陽極用アルミニウム合金 |
| JPH1143749A (ja) * | 1997-07-22 | 1999-02-16 | Showa Alum Corp | 歪みの少ないリチウム電池用アルミニウム箔の製造方法 |
| JP2004207117A (ja) * | 2002-12-26 | 2004-07-22 | Toyo Aluminium Kk | 集電体用アルミニウム箔、集電体および二次電池 |
| JP2009062594A (ja) * | 2007-09-07 | 2009-03-26 | Sumitomo Light Metal Ind Ltd | アルミニウム箔材 |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2005174949A (ja) | 2003-11-18 | 2005-06-30 | Toyo Aluminium Kk | 電解コンデンサ用アルミニウム箔の製造方法。 |
| US7279250B2 (en) * | 2003-11-24 | 2007-10-09 | The Gillette Company | Battery including aluminum components |
| JP4644020B2 (ja) * | 2005-03-31 | 2011-03-02 | 株式会社神戸製鋼所 | 多孔加工用アルミニウムはく、およびその製造方法 |
| JP4813152B2 (ja) | 2005-11-14 | 2011-11-09 | 富士重工業株式会社 | リチウムイオンキャパシタ |
| KR101413774B1 (ko) * | 2006-12-27 | 2014-06-30 | 제이에무에나지 가부시키가이샤 | 도포 전극 및 유기 전해질 캐패시터 |
| JP4237236B2 (ja) | 2007-04-24 | 2009-03-11 | 三菱アルミニウム株式会社 | 電解コンデンサ用アルミニウム箔およびその製造方法 |
| JP2009062595A (ja) | 2007-09-07 | 2009-03-26 | Sumitomo Light Metal Ind Ltd | アルミニウム箔材 |
-
2010
- 2010-09-22 KR KR1020127006861A patent/KR101736042B1/ko not_active Expired - Fee Related
- 2010-09-22 WO PCT/JP2010/066358 patent/WO2011040292A1/ja not_active Ceased
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- 2010-09-22 CN CN201080043277.2A patent/CN102575322B/zh not_active Expired - Fee Related
- 2010-09-24 TW TW099132344A patent/TWI493049B/zh not_active IP Right Cessation
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS63145757A (ja) * | 1987-10-15 | 1988-06-17 | Toyo Alum Kk | 軟質アルミニウム箔の製造方法 |
| JPH06306520A (ja) * | 1993-04-20 | 1994-11-01 | Nippon Foil Mfg Co Ltd | 軟質アルミ箔およびその製造方法 |
| JPH08260117A (ja) * | 1995-03-23 | 1996-10-08 | Furukawa Electric Co Ltd:The | 電解コンデンサ陰極用アルミニウム合金箔地の製造方法 |
| JPH10189396A (ja) * | 1996-12-26 | 1998-07-21 | Nippon Light Metal Co Ltd | 電解コンデンサ陽極用アルミニウム合金 |
| JPH1143749A (ja) * | 1997-07-22 | 1999-02-16 | Showa Alum Corp | 歪みの少ないリチウム電池用アルミニウム箔の製造方法 |
| JP2004207117A (ja) * | 2002-12-26 | 2004-07-22 | Toyo Aluminium Kk | 集電体用アルミニウム箔、集電体および二次電池 |
| JP2009062594A (ja) * | 2007-09-07 | 2009-03-26 | Sumitomo Light Metal Ind Ltd | アルミニウム箔材 |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103563028A (zh) * | 2011-05-26 | 2014-02-05 | 东洋铝株式会社 | 用于铝电解电容器的电极材料及其制造方法 |
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| CN102575322A (zh) | 2012-07-11 |
| CN102575322B (zh) | 2014-04-02 |
| US20120219817A1 (en) | 2012-08-30 |
| TW201124540A (en) | 2011-07-16 |
| KR101736042B1 (ko) | 2017-05-16 |
| KR20120094468A (ko) | 2012-08-24 |
| TWI493049B (zh) | 2015-07-21 |
| US9331339B2 (en) | 2016-05-03 |
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