CN102031428A - Aluminum alloy hard foil for battery collector - Google Patents
Aluminum alloy hard foil for battery collector Download PDFInfo
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- CN102031428A CN102031428A CN2010102936658A CN201010293665A CN102031428A CN 102031428 A CN102031428 A CN 102031428A CN 2010102936658 A CN2010102936658 A CN 2010102936658A CN 201010293665 A CN201010293665 A CN 201010293665A CN 102031428 A CN102031428 A CN 102031428A
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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
- H01M4/662—Alloys
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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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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/052—Li-accumulators
- H01M10/0525—Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion 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
- Y02E60/10—Energy storage using batteries
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Abstract
An aluminum alloy hard foil for battery collector comprises the following components: 0.8-1.5wt% of Mn; 0.05-0.20wt% of Cu; 0.3-0.7wt% of Fe, and the balance of Al and inevitable impurity. The thickness of the alminium alloy hard foil for battery collector is 9-20 mu m. More than thirty subgrains are provided in a thickness direction. The tensile strength is 280-350MPa and the extensibility is more than 3.5%. According to the composition, the aluminum alloy hard foil for battery collector has a high strength and excellent extensibility.
Description
Technical field
The present invention relates to battery current collector aluminium alloy hard paper tinsel as the positive electrode collector use of lithium-ion secondary cell.
Background technology
In recent years, as the mobile equipment power supply of mobile telephone and notebook computer etc., use be lithium-ion secondary cell.The electrode materials of such lithium-ion secondary cell is formed by positive electrode material, distance piece and negative material.And the manufacturing of positive electrode material is following to be carried out: the current collector about thick 15 μ m is coated with the LiCoO about thick 100 μ m with the two sides of aluminium foil (or alloy foil)
2The isoreactivity material carries out drying for the solvent of the active substance of removing this coating, and is used to increase the pressing of density of active substance, again through incision, segmentation process.Also have, be used for removing the drying process that desolvates, to keep about 30 minutes condition to carry out down at 100～150 ℃.
In recent years, along with the progress of the high capacity of battery, in order to realize the thin-walled property of employed alloy foil, and point to high-intensity alloy foil.Therefore, for example " 2008 up-to-date battery technology complete works ", society of strain trade union e-magazine, distribution on May 1st, 2008, the 8th piece of the 1st chapter the 7th joint, P243 is disclosed, and employed is 3003 alloys and the development that strength ratio is existing 1085,1N30 is high, has used these the alloy foil market of intensity 230～345MPa on sale.
In addition, for example the following scheme of proposition is arranged at Japanese kokai publication hei 11-67220 number.That is be in the Alloy Foil at Al-Mn,, if owing to the drying process of active substance causes aluminium foil softening, intensity reduces, then pressing in the operation dried, and the paper tinsel that has softened extends easily, in the painting part of electrode composition and the boundary of uncoated portion, the wrinkling etc. of aluminium foil taken place.Therefore, the intensity when proposing 0.1% unit elongation is increased to about 168～240MPa.
In addition, for example in TOHKEMY 2008-150651 number, propose as follows.That is, if use hard active substance, then when being received into it in battery case, the electrode materials of volume (folding) curl has the tendency of easy fracture at the little position of radius.Therefore proposing, is to increase Cu content in the Alloy Foil at Al-Mn, when reaching the regulation thickness of slab when cooling is rolled, uses continuous annealing furnace to carry out process annealing with prescribed condition, reaching the intensity of 280～380MPa, thereby improves anti-folding line.
In addition, for example in TOHKEMY 2009-64560 number, also propose, add Mg, Co, Zr, W etc., reach the intensity of 240～400MPa, to obtain ductility and erosion resistance.
But, in existing alloy foil, have following problem.
In alloy foil, along with the rising and the thick minimizing of paper tinsel of intensity, unit elongation (ductility) reduces as can be known.Also have, this also has in aforesaid non-patent literature clearly shows, in addition, also shows among the embodiment in TOHKEMY 2009-64560 number, for example under the tensile strength of 290MPa, is stuck in the unit elongation about 3.1%.
But, make at electrode materials in the operations such as pressing on the line, incision, even high strength, but if unit elongation is few, then paper tinsel is in crisp state, and the problem of existence is, and paper tinsel ruptures on the line making, and line takes place to make stop such fault.
Summary of the invention
The present invention finishes in view of foregoing problems, and its problem is, a kind of high strength is provided, and has the battery current collector aluminium alloy hard paper tinsel of excellent unit elongation.
In order to solve aforementioned problems, present inventors study for following item.
For the high strength of paper tinsel, be well known that adding Mg, Mn, Cu etc. gets final product, this also is used to the motion of aforementioned prior art.But, and the method for not knowing to make the ductility (rolling property) of thin-walled hard paper tinsel to increase.On the other hand, as can be known when the manufacturing of fine aluminium thin-walled paper tinsel, by the solid solution in the manufacturing process of material, separate out the control of control and paper tinsel rolling condition, can make the material structure before the paper tinsel finish to gauge become the subgrain tissue, thereby can produce the few thin foil of pore.Because this structural state unit elongation is also than higher, therefore think, be in the Alloy Foil accessing high-intensity Al-Mn, by becoming the subgrain tissue, and make the subgrain miniaturization, also can access high ductibility.
Usually, as can be known with transmission electron microscope when face side is observed the material structure of paper tinsel, subgrain has the diameter about 2 μ m, but can't carry out the observation under the cross section of the paper tinsel about thickness 15 μ m.Therefore, carried out conscientious research for the factors of the unit elongation that has influence on the hard paper tinsel, results presumption is, the crystal grain of thickness direction (subgrain) is interrelated with unit elongation, the subgrain observation condition in the cross section by establishing paper tinsel again, thus reach the present invention.Promptly find, no matter be the hard paper tinsel of which kind of state,, be about 2 μ m although do not change from the subgrain diameter of surface observation, but the subgrain diameter (thickness) in cross section is (paper tinsel of thick 15 μ m, the subgrain quantity of thickness direction is about 5～10) about 1.5～3 μ m.Find point according to this, personnel such as present inventor find, be because the subgrain quantity of thickness direction is few in the past, so uneven distortion is arranged, become the low state of unit elongation,, then can be out of shape uniformly by tensile deformation etc. if control the subgrain quantity of thickness direction many, obtain high-elongation, thereby finish the present invention.Also find, the subgrain of thickness direction is the layer growth that is subjected to rolling and attenuation of the crystal grain diameter during by process annealing, forms, also find, form a large amount of subgrains in order to make thickness direction, number of die and solid solution condition during control process annealing are prerequisites.
Promptly, battery current collector of the present invention is to contain battery current collector that Mn:0.8～1.5 quality %, Cu:0.05～0.20 quality %, Fe:0.3～0.7 quality % and surplus be made of Al and unavoidable impurities with aluminium alloy hard paper tinsel with aluminium alloy hard paper tinsel (the following alloy foil that is called simply), wherein, described battery current collector is 9～20 μ m with the thickness of aluminium alloy hard paper tinsel, subgrain is having on the thickness direction more than 30, tensile strength is 280～350MPa, and unit elongation is more than 3.5%.
According to this formation, add Mn, Cu, Fe with specified amount, the intensity of alloy foil improves, and tensile strength is 280～350MPa, reaches full intensity, and adds Fe by specified amount, and crystal grain obtains miniaturization during process annealing.In addition, making thickness is 9～20 μ m, can become the alloy foil that is suitable for as battery current collector.In addition, the subgrain quantity that makes thickness direction is more than 30, thereby the unit elongation of alloy foil improves, and unit elongation reaches more than 3.5%, has as the sufficient unit elongation of battery current collector.
Perhaps, battery current collection of the present invention is with aluminium alloy hard paper tinsel (the following alloy foil that is called simply), be battery current collector that make aluminium alloy hard paper tinsel via overlapping rolling, wherein, contain Mn:0.8～1.5 quality %, Cu:0.05～0.20 quality %, Fe:0.3～0.7 quality %, and surplus is made of Al and unavoidable impurities, described battery current collector is 9～15 μ m with the thickness of aluminium alloy hard paper tinsel, subgrain is having on the thickness direction more than 30, tensile strength is 280～350MPa, and unit elongation is more than 1.0%.
According to this formation, add Mn, Cu, Fe with specified amount, the intensity of alloy foil improves, and tensile strength is 280～350MPa, reaches full intensity, and adds Fe by specified amount, and crystal grain obtains miniaturization during process annealing.In addition, making thickness is 9～15 μ m, can become the alloy foil that is suitable for as battery current collector.In addition, be more than 30 by the subgrain quantity that makes thickness direction, thereby the unit elongation of alloy foil improve, unit elongation is more than 1.0%, has as the sufficient unit elongation of battery current collector.
Battery current collector of the present invention is with aluminium alloy hard paper tinsel, preferably also contains the following and Si:0.6 quality % of Mg:0.2 quality % more than one among following.
According to this formation, add Mg by specified amount, thereby intensity improves, and adds Si, the raising of the rolling property of paper tinsel by specified amount.
Battery current collector of the present invention is with aluminium alloy hard paper tinsel, also can also contain the following and Zn:0.3 quality % of Cr:0.2 quality % more than one among following.
In alloy foil of the present invention, though contain Cr:0.2 quality % following, below the Zn:0.3 quality %, can not cause detrimentally affect to each characteristic of present techniques scheme yet.
Battery current collector of the present invention even the thin-walled of thickness 9～20 μ m when perhaps making via overlapping rolling, is the thin-walled of thickness 9～15 μ m, also has full intensity with aluminium alloy hard paper tinsel.Therefore, can realize the high capacity of lithium-ion secondary cell.In addition, because unit elongation is also excellent,, in the manufacturing process of electrode materials, can prevents the paper tinsel fracture, thereby can prevent to make the generation that line stops such fault so rolling property (the rolling property of paper tinsel) improves.
In addition, one-tenth of the present invention is grouped in the composition range of JIS3003, but as difference is, although become to be grouped in co-extensive, but by the regulation subgrain, also have following significant effect: (1) is even high strength H material still can be obtained high-elongation; (2) because can use the composition of JIS3003, so material and slab (ingot bar) that can other purposes of dual-purpose be cut down on the point of (turnover of funds) excellent at productivity and goods.
Description of drawings
Fig. 1 is the image of measuring method that is used to illustrate the subgrain quantity of embodiment, (a) is the orientation map figure (Japanese: orientation マ Star ピ Application グ picture), (b) be the color code in subgrain orientation of the ND face one of among the embodiment.
Fig. 2 is the image of measuring method that is used to illustrate the subgrain quantity of embodiment, is the orientation map figure of the ND face of one of comparative example (a), (b) is the color code in subgrain orientation.
Embodiment
Below, just be used to realize that battery current collector of the present invention describes with the mode of aluminium alloy hard paper tinsel (below, the suitable alloy foil that is called).
Alloy foil of the present invention contains Mn, Cu, Fe with specified amount, and surplus is made of Al and unavoidable impurities.And the thickness of this alloy foil is 9～20 μ m, and at its thickness direction, subgrain exists more than 30.In addition, tensile strength is defined as 280～350MPa, and unit elongation is defined as more than 3.5%.
Perhaps, alloy foil of the present invention is that battery current collector that make is used aluminium alloy hard paper tinsel via overlapping rolling, contains Mn, Cu, Fe with specified amount, and surplus is made of Al and unavoidable impurities.And the thickness of this alloy foil is 9～15 μ m, and on its thickness direction, subgrain exists more than 30.In addition, be 280～350MPa with tensile strength, and unit elongation is defined as more than 1.0%.
Below, describe for each formation.
(Mn:0.8～1.5 quality %)
Mn is used to improve the intensity of alloy foil and the element that adds.When Mn content is lower than 0.8 quality %, can not obtain full intensity.On the other hand, if surpass 1.5 quality %, then produce thick intermetallic compound, the reduction of the rolling property of paper tinsel.Therefore, Mn content is 0.8～1.5 quality %.
(Cu:0.05～0.20 quality %)
Cu is in order to improve the element that intensity is added by solution strengthening.When Cu content was lower than 0.05 quality %, the inhibition that the intensity when active substance is dry reduces was insufficient.On the other hand, if surpass 0.20 quality %, then intensity becomes too high, the reduction of the rolling property of paper tinsel.Therefore, Cu content is 0.05～0.20 quality %.
(Fe:0.3～0.7 quality %)
Fe is the crystal grain miniaturization during for process annealing, in addition in order to improve the element that intensity is added by solution strengthening.When Fe content was lower than 0.3 quality %, crystal grain diameter was thick, can not get sufficient subgrain quantity at thickness direction, also was difficult to obtain full intensity in addition.On the other hand, if surpass 0.7 quality %, then produce thick intermetallic compound, the reduction of the rolling property of paper tinsel.Therefore, Fe content is 0.3～0.7 quality %.
Alloy foil of the present invention also can also contain the following and Si:0.6 quality % of Mg:0.2 quality % more than one among following.In addition, it is also no problem to contain the following and Zn:0.3 quality % of Cr:0.2 quality % more than one among following.
(Mg:0.2 quality % is following)
Mg is in order to improve the element that intensity is added by solution strengthening.But if Mg content surpasses 0.2 quality %, then intensity is too high, the reduction of the rolling property of paper tinsel.But Mg content is below the 0.2 quality %.
(Si:0.6 quality % is following)
Si is the element that helps the raising of the rolling property of paper tinsel.Si can measure interpolation in accordance with regulations, also can be used as impurity and sneaks into.But, if Si content surpasses 0.6 quality %, then forming the intermetallic compound of Al-Mn-Si system, crystal grain diameter is thick, can't obtain sufficient subgrain quantity at thickness direction.Therefore, Si content is below the 0.6 quality %.Also have,, preferably add 0.2～0.3 quality % in order further to improve the rolling property of paper tinsel.
(Cr:0.2 quality % is following)
Cr has the situation of sneaking into as impurity, but allows to contain to 0.2 quality %, if in this scope, also can not cause detrimentally affect to each characteristic of present techniques scheme even then add.Therefore, Cr content is 0.2 quality % following (it is following to be suppressed at 0.2 quality %).
(Zn:0.3 quality % is following)
Zn has the situation of sneaking into as impurity, but allows to contain to 0.3 quality %, if in this scope, also can not cause detrimentally affect to each characteristic of present techniques scheme even then add.Therefore, Zn content is 0.3 quality % following (it is following to be suppressed at 0.3 quality %).
In addition, organize miniaturization, the situation of adding Ti and B is arranged in order to make ingot bar.Promptly, also can be with Ti: B=5: 1 or the ingot bar miniaturization agent of 5: 0.2 ratio, add in the molten soup (the molten soup of having put into any one stage of melting furnace before slab solidifies, inclusion strainer, de-gassing vessel, molten soup flow rate control device) to the form of cake or rod, the Ti amount allows to contain till the 0.05 quality %.
(surplus: Al and unavoidable impurities)
The composition of alloy foil is except that aforementioned, and surplus is made of Al and unavoidable impurities.Also have,, Ga, V in the contained common known range of alloy and master alloy, Ni etc. are for example arranged, allow respectively to contain till the 0.05 quality % as unavoidable impurities.
(thickness: 9～20 μ m, 9～15 μ m)
In order to increase the cell container of lithium-ion secondary cell, the method for the thin thickness of alloy foil is advisable, have any problem but make the high strength paper tinsel that thickness is lower than 9 μ m.In addition, if surpass 20 μ m, then can not put into a lot of electrode materialss in the shell that defines volume, cell container reduces.Therefore, the thickness of alloy foil is 9～20 μ m.During via rolling manufacturing of coincidence, be 9～15 μ m.
Also have, overlap when rolling, the face that alloy foil overlaps each other becomes the tarnish of the delustring face of being known as, concavo-convex big face, and therefore, the single rolled stock of deviation ratio two sides glossy that the paper tinsel that is caused by the position is thick wants big.Therefore, when thickness has some inhomogeneous, as long as the thick mean value of paper tinsel is 9～15 μ m.
(the subgrain quantity of thickness direction: more than 30)
For the unit elongation of the alloy foil that increases thickness 9～20 μ m, the subgrain quantity that need make thickness direction is (paper tinsel of thick 15 μ m, subgrain diameter (thickness) are that 0.5 μ m is following) more than 30.When the subgrain quantity of thickness direction is lower than 30, can't fully obtain the unit elongation of alloy foil.In addition, subgrain quantity also can have more several, and its upper limit is not particularly limited.In addition as described above, the subgrain of thickness direction is the layer growth that is subjected to rolling and attenuation of the crystal grain diameter during by process annealing, forms, so this layer needs more than 30 layers.And the recrystallization grains when this means process annealing has more than 30 at thickness direction.
Also have, as described above, paper tinsel is thick through overlapping rolling during heterogeneity, and (when the mean value part does not exist, near the place of mean value) is to get final product more than 30 to subgrain quantity in the thick place that is in mean value of paper tinsel.
Then, the establishment for the measuring method of the subgrain quantity of thickness direction describes.
At first, alloy foil is cut to about 5 * 10mm, on the thin plate base, uses conductive tape to paste the paper tinsel of this cut-out, make paper tinsel become outstanding slightly state.Secondly, cut off the part of this paper tinsel, observe parallel cut with FIB (focused ion beam Focused Ion Beam) device.Also have, in a large amount of resin embedding methods of using, when carrying out SEM (scanning electronic microscope) observation, resin portion is charged, measures difficulty.Then, for this cross section, use SEM, making and observing multiplying power is 2000 times, carries out EBSD (Electron Back-Scattered Diffraction is analyzed Electron Back Scatter Diffraction) and analyzes, and obtains orientation map figure.Also have, because carry out viewpoint usually from the surface, so analysis software shows the orientation map figure that watches the ND face from the surface automatically.In this analysis, be that parallel cut (RD-TD face) is observed, be rotated the orientation map figure of operation with the ND face that obtains watching from the RD-ND face.Then, by this orientation map figure (with reference to Fig. 1) that obtains, calculate subgrain quantity with segment method.Specific as follows.The intercrystalline inclination angle of subgrain is 0～15 °, and same subgrain is same angle.Then, 0 ° of color is the denseest, and 15 ° of colors are the most shallow.For this item, all be to use the color code of Fig. 1 (b) of the relation of representing color and crystalline orientation, the orientation map figure (orientation mapping graph) according to Fig. 1 (a) judges intercrystalline inclination angle and color with naked eyes, the statistics subgrain.
(tensile strength: 280～350MPa)
When tensile strength is lower than 280MPa, insufficient as the intensity of alloy foil.On the other hand, if surpass 350MPa, the then reduction of the rolling property of paper tinsel.Therefore, tensile strength is 280～350MPa.
(unit elongation: more than 3.5%, more than 1.0%)
Unit elongation is lower than at 3.5% o'clock, and is insufficient as the extension of battery current collector paper tinsel.Therefore, unit elongation is more than 3.5%.When making via overlapping rolling, unit elongation is more than 1.0%.Also has the preferred high degree of unit elongation.
The measurement of tensile strength and unit elongation can use the Type B test film to implement according to the specification LIS AT5 of light metal association.That is, from alloy foil, make down wide 15mm * be about the strip specimen of 200mm of draw direction and cutting parallel, implement as the evaluation spacing with distance between the chuck of 100mm with rolling direction.In test, can use the オ リ エ of Co., Ltd. Application テ Star Network system TENSILON universal testing machine, model: RTC-1225A.
(manufacture method of alloy foil)
Next, the manufacture method for alloy foil describes.The manufacture method of alloy foil is carried out as follows: according to method in common the aluminium alloy ingot bar is homogenized after thermal treatment, the hot rolling, carry out cold rolling, process annealing with prescribed condition, carry out cold rolling (comprising that paper tinsel is rolling) then.
Also have, paper tinsel is rolling by single rolling or overlap rolling carrying out.That is, alloy foil is by single rolling or overlap rolling manufacturing and form.So-called single rolling, be exactly to supply with a slice alloy foil until final operation (Japanese: to roller
パ ス), be rolled, so-called coincidence is rolling, is exactly in final operation, with two overlapping rollers that are supplied in of alloy foil, is rolled.
In alloy foil, for a large amount of subgrains that obtain, the crystal grain diameter when preferably making process annealing is fine.For this reason, preferably cold working rate (cold rolling rate) height till the process annealing preferably reaches the cold rolling rate more than 30%.In addition, in order to make intensity improve also preferred cold rolling rate more than 30%.But if the cold rolling rate till process annealing surpasses 85%, then effect is saturated, lacks economy, therefore is preferably below 85%.
After the process annealing; need form alloy foil with the cold rolling rate of height; promote the subgrain granulation; and need to improve intensity especially; therefore the cold rolling rate after the preferred process annealing, that is, from after the annealing of centre to the total cold rolling rate that becomes final alloy foil (finished product) be more than 98.5%; for this reason, the thickness of slab during preferred process annealing is more than the 1mm.In addition, in order to obtain high strength with alloy foil, the class back during also preferred process annealing is more than the 1mm.But if carrying out process annealing above under the thickness of 2mm, then intensity is too high, and therefore the rolling difficulty that becomes easily of paper tinsel is preferably below the 2mm.Also have, paper tinsel is rolling to carry out easily in order to make, even the absolute value height of preferred intensity also solidifies seldom in the thick processing down of paper tinsel of the following degree of thick 100 μ m.
At this, process annealing is in order to make the recrystallization particle diameter forming on the thickness direction more than 30, that is, be more than 30 in order to make the subgrain quantity on the thickness direction, and the annealing of carrying out with continuous annealing furnace.And, be more than 380 ℃, below 550 ℃ with annealing temperature (arrival temperature), the hold-time is that the condition below 1 minute is carried out.
When annealing temperature was lower than 380 ℃, recrystallization can't fully carry out, the subgrain quantity not sufficient, and intensity is also slightly high.On the other hand, if surpass 550 ℃, then effect is saturated, and makes the appearance deterioration easily.In addition, warming and cooling rate is that the scope of the ordinary method of continuous annealing gets final product, but in batch annealing, even in the scope of ordinary method, add and pine for separating out also and can make progress, the merging of subgrain when paper tinsel is rolling, thickization progress, subgrain quantity not sufficient.In addition, processing solidified degree is also insufficient, and intensity reduces.Also have, during continuous annealing, heat-up rate is 1～100 ℃/second, and cooling rate is 1～500 ℃/second, and this is the ordinary method scope.During batch annealing, heat-up rate is 20～60 ℃/hour, cooling rate use arbitrarily stove cold, put cold, forced air-cooling, follow these conditions and carry out.
And preferably the hold-time is long for solid solution, but because be continuous annealing furnace, so surpass 1 minute maintenance, the goods linear velocity can be significantly slack-off, and is therefore less economical.
Crystal grain quantity, solid solution condition when so, the subgrain quantity of thickness direction can be by composition range, process annealing are controlled.
[embodiment]
More than, just be used to implement mode of the present invention and set forth, below, compare confirming the embodiment of effect of the present invention and the comparative example of the important document that discontented unabridged version is invented, specifically be illustrated.Also have, the present invention is not limited by this embodiment.
＜embodiment 1 〉
At first, example is via the single rolling and embodiment of the alloy foil made.
(making) for the examination material
(embodiment No.1～10, comparative example No.11～19)
The aluminium alloy of forming shown in the his-and-hers watches 1 melts, casts and becomes ingot bar, after this ingot bar enforcement facing cut is cut, implements the thermal treatment that homogenizes in 4 hours with 540 ℃.The ingot bar that this process homogenizes is implemented hot rolling, implement cold rolling laggard interline annealing again., by single rolling carry out paper tinsel rolling condition undertaken cold rolling,, become alloy foil up to removing a part to the thickness of 15 μ m thereafter.The condition of process annealing is to use continuous annealing furnace, 450 ℃ of annealing temperatures, 10 ℃/second of heat-up rates, 20 ℃/second of cooling rates, 5 seconds hold-times.The thickness of the plate after the hot rolling (paper tinsel quality) is 3.5mm, and the thickness of the plate (paper tinsel quality) before the process annealing is that (the cold rolling rate before the process annealing is 60% to 1.4mm, the cold rolling rate after the process annealing (total cold rolling rate): about 98.9%).Also have, the No. α of table 1 is based on the alloy foil of TOHKEMY 2008-150651 number record, because can use in " based on the evaluation of manufacture method " described later, records and narrates in table 1 for convenience.
(embodiment No.20～25, comparative example No.26～35)
Aluminium alloy shown in the his-and-hers watches 2 (in the table 1 corresponding alloy A, C, D, F, T) melts, casts and becomes ingot bar.After this ingot bar implemented facing cut and cut,, implement the thermal treatment that homogenizes in 6 hours with 520 ℃, implement the thermal treatment that homogenizes in 2 hours with 540 ℃ for other for No.35.The ingot bar that this process homogenizes is implemented hot rolling, implement cold rolling laggard interline annealing again., by single rolling carry out paper tinsel rolling condition undertaken cold rolling,, become alloy foil up to removing a part to the thickness of 15 μ m thereafter.Process annealing, cold rolling condition are as shown in table 2.Also have, during continuous annealing (CAL), 10 ℃/second of heat-up rates, cooling rate is 20 ℃/second, during batch annealing (BACH), 40 ℃/hour of heat-up rates, cooling rate is 80 ℃/hour (putting cold).In addition, total cold rolling rate is general value.
One-tenth is grouped into and is presented in the table 1, and creating conditions is presented in the table 2.Also have, discontented unabridged version scope of invention and do not satisfy and create conditions, under its numerical value, draw underscore in the table and represent, represent with "-" for the composition that does not contain.In addition, No.35 is based on the alloy foil of TOHKEMY 2008-150651 number record, though No.27,31,32 composition differences, the process annealing condition is based on the alloy foil of TOHKEMY 2008-150651 number record.In addition, the thickness of the paper tinsel in the table 2 after the hot rolling is designated as hot rolling and finishes thickness, and the thickness of the paper tinsel before the process annealing is recorded and narrated and is process annealing thickness.
(number of subgrain)
Then, measure the number of alloy foil according to following method in the subgrain of thickness direction.
At first, alloy foil is cut to about 5 * 10mm, on the thin plate base, uses conductive tape to paste the paper tinsel of this cut-out, make paper tinsel become outstanding slightly state.Secondly, cut off the part of this paper tinsel, make parallel cut can access observation with FIB (focused ion beam Focused Ion Beam) device.Then, for this cross section, use scanning electronic microscope, making and observing multiplying power is 2000 times, carries out EBSD (Electron Back-Scattered Diffraction is analyzed Electron Back Scatter Diffraction) and analyzes, and obtains orientation map figure.Also have, because observe from the surface usually, so analysis software shows the orientation map figure that watches the ND face from the surface automatically.In this analysis, be that parallel cut (RD-TD face) is observed, be rotated the orientation map figure of operation with the ND face that obtains watching from the RD-ND face.Then, by this orientation map figure (with reference to Fig. 1) that obtains, calculate subgrain quantity with segment method.
Its result is presented in the table 1,2.Also have, be presented among Fig. 1 (a), show the color code in subgrain orientation among Fig. 1 (b) about the orientation map of the ND face of embodiment No.20.In addition, be presented among Fig. 2 (a), show the color code in subgrain orientation among Fig. 2 (b) about the orientation map of the ND face of comparative example No.26.
At this, intercrystalline inclination angle is being subgrain below 15 °, and same subgrain is same color.Also have, the relation of color and crystalline orientation is represented by color code.In addition, though the intercrystalline inclination angle of subgrain is 0～15 °, 0 ° of color is the denseest, and 15 ° of colors are the most shallow.Then, add foreground, judge the orientation mapping graph, the statistics subgrain with naked eyes.Also have, subgrain be tiny area where, subgrain has some differences according to different its quantity in position, but in the instrumentation of thickness direction, the quantity at the minimum position of this instrumentation.
(evaluation)
Carry out following evaluation with resulting alloy foil.
(intensity and unit elongation)
The mensuration of tensile strength and unit elongation according to the specification LIS AT5 of light metal association, uses the Type B test film to implement.That is, from alloy foil, make down wide 15mm * be about the strip specimen of 200mm of draw direction and cutting parallel, implement as the evaluation spacing with distance between the chuck of 100mm with rolling direction.In test, can use the オ リ エ of Co., Ltd. Application テ Star Network system TENSILON universal testing machine, model: RTC-1225A.By this test, measure tensile strength and unit elongation.The criterion of acceptability of intensity is tensile strength 280～350MPa, and the criterion of acceptability of unit elongation is more than 3.5%.
These results are presented in the table 1,2.Also have, the discontented unabridged version scope of invention of the number of subgrain in the table, tensile strength, unit elongation do not satisfy criterion of acceptability, draws underscore represent under its numerical value, can't estimate because of the manufacturing that can not carry out alloy foil, represents with "-".
(from the evaluation of alloy foil)
As shown in table 1, satisfy scope of the present invention as No.1～10 of embodiment, so intensity and unit elongation excellence.
On the other hand, No.11 as a comparative example～19 are because be discontented with the unabridged version scope of invention, so cause following result.
No.11 is because Si content surpasses higher limit, so the Al-Mn-Si series intermetallic compound forms in a large number, recrystallization is hindered, so crystal grain diameter is thick, and subgrain quantity is lower than lower value.Therefore extend rate variance.No.12 is lower than lower value because of Mn content, so tensile strength is low, and intensity difference.
No.13 is because Fe content is lower than lower value, so crystal grain diameter is thick, subgrain quantity is lower than lower value.Therefore extend rate variance.In addition, tensile strength is low, intensity difference.No.14 is because Fe content surpasses higher limit, so thick intermetallic deposits yields in the rolling way of paper tinsel hole takes place.Therefore, it is rolling to continue paper tinsel.
No.15 is lower than lower value because of Cu content, so tensile strength is low, and intensity difference.No.16 is because Cu content surpasses higher limit, so intensity is too high, the reduction of the rolling property of paper tinsel can not be rolled down to the thickness of 15 μ m.
No.17 is lower than lower value because of Mn content, so tensile strength is low, and intensity difference.No.18 is because Mn content surpasses higher limit, so thick intermetallic deposits yields, the reduction of the rolling property of paper tinsel can not be rolled down to the thickness of 15 μ m.
No.19 is because Mn content surpasses higher limit, so intensity is too high, the reduction of the rolling property of paper tinsel can not be rolled down to the thickness of 15 μ m.
(based on the evaluation of manufacture method)
As shown in table 2, satisfy scope of the present invention as No.20～25 of embodiment, so intensity and unit elongation excellence.
On the other hand, No.26 as a comparative example～35 are because be discontented with the unabridged version scope of invention, so cause following result.
No.26 is because process annealing is batch-type, so can not get fine crystal grain during process annealing, subgrain growth when paper tinsel is rolling, merges, and can't obtain sufficient quantity.It is also insufficient to process the solidified degree in addition.In addition, process annealing thickness and total cold rolling rate are insufficient.Therefore tensile strength is low, intensity difference, and subgrain quantity is lower than lower value in addition, extends rate variance.No.27 is insufficient because of process annealing thickness and total cold rolling rate, so tensile strength is low, and intensity difference.No.28 is because process annealing is batch-type, so can not get fine crystal grain during process annealing.Therefore subgrain growth, merging when paper tinsel is rolling can't obtain sufficient quantity, and subgrain quantity is lower than lower value, extends rate variance.It is also insufficient to process the solidified degree in addition, and tensile strength is low, intensity difference.
No.29 is because process annealing thickness is blocked up, so the reduction of the rolling property of paper tinsel can not be rolled down to the thickness of 15 μ m.In addition, because it is too high to arrive temperature, so surface indentation takes place in manufacturing process.Also have, total cold rolling rate is for finishing the value in the rolling moment.No.30 is low excessively because arrive temperature, thus can't be through process annealing and recrystallization, and subgrain quantity is lower than lower value.Therefore, extend rate variance.In addition, tensile strength is high slightly.Also have, the height of tensile strength is the degree a little more than higher limit of the present invention, therefore can be rolled down to the thickness of 15 μ m with great difficulty.No.31 is insufficient because of process annealing thickness and total cold rolling rate, so tensile strength is low, and intensity difference.
No.32 is insufficient because of process annealing thickness and total cold rolling rate, so tensile strength is low, and intensity difference.No.33 is low excessively because arrive temperature, thus can't be through process annealing and recrystallization, and subgrain quantity is lower than lower value.Therefore, extend rate variance.In addition, tensile strength is high slightly.Also have, the height of tensile strength is the degree a little more than higher limit of the present invention, therefore can be rolled down to the thickness of 15 μ m with great difficulty.No.34 is because insufficient to the cold rolling rate of process annealing, so crystal grain diameter is thick, subgrain quantity is lower than lower value.Therefore, extend rate variance.In addition, tensile strength is low, intensity difference.No.35 is based on the alloy foil as TOHKEMY 2003-150651 number record of prior art, and therefore, though excellent strength, subgrain quantity is lower than lower value, extends rate variance.
＜embodiment 2 〉
Then, the embodiment alloy foil made via overlapping rolling is described.
(embodiment No.101～110, comparative example No.111～119)
The aluminium alloy of forming shown in the his-and-hers watches 3 melts, casts and becomes ingot bar, after this ingot bar enforcement facing cut is cut, implements the thermal treatment that homogenizes in 4 hours with 540 ℃.The ingot bar that this process homogenizes is implemented hot rolling, implement cold rolling laggard interline annealing again.By overlap rolling carry out paper tinsel rolling condition to be undertaken cold rolling, up to remove a part to the thickness of mean value 12 μ ms, become alloy foil thereafter.The condition of process annealing is to use continuous annealing furnace, 450 ℃ of annealing temperatures, 10 ℃/second of heat-up rates, 20 ℃/second of cooling rates, 5 seconds hold-times.The thickness of the plate after the hot rolling (paper tinsel quality) is 3.0mm, and the thickness of the plate (paper tinsel quality) before the process annealing is that (the cold rolling rate before the process annealing is 50% to 1.5mm, the cold rolling rate after the process annealing (total cold rolling rate): about 99.2%).Also have, the No. β of table 1 is based on the alloy foil of TOHKEMY 2008-150651 number record, because can use in " based on the evaluation of manufacture method " described later, records and narrates in table 3 for convenience.
(embodiment No.120～125, comparative example No.126～135)
Aluminium alloy shown in the his-and-hers watches 4 (in the table 3 corresponding alloy A, C, D, F, T) melts, casts and becomes ingot bar.After this ingot bar implemented facing cut and cut,, implement the thermal treatment that homogenizes in 6 hours with 520 ℃, implement the thermal treatment that homogenizes in 2 hours with 540 ℃ for other for No.135.The ingot bar that this process homogenizes is implemented hot rolling, implement cold rolling laggard interline annealing again.By overlap rolling carry out paper tinsel rolling condition to be undertaken cold rolling, up to remove a part to the thickness of 12 μ ms, become alloy foil thereafter.Process annealing, cold rolling condition are as shown in table 4.Also have, during continuous annealing (CAL), 10 ℃/second of heat-up rates, cooling rate is 20 ℃/second, during batch annealing (BACH), 40 ℃/hour of heat-up rates, cooling rate is 80 ℃/hour (putting cold).In addition, total cold rolling rate is general value.
One-tenth is grouped into and is presented in the table 3, and creating conditions is presented in the table 4.Also have, discontented unabridged version scope of invention and do not satisfy and create conditions, under its numerical value, draw underscore in the table and represent, represent with "-" for the composition that does not contain.In addition, No.135 is based on the alloy foil of TOHKEMY 2008-150651 number record, though No.127,131,132 composition differences, the process annealing condition is based on the alloy foil of TOHKEMY 2008-150651 number record.In addition, the thickness of the paper tinsel in the table 4 after the hot rolling is recorded and narrated to hot rolling finishes thickness, and the thickness of the paper tinsel before the process annealing is recorded and narrated and is process annealing thickness.
The number measuring method of the subgrain of the thickness direction of alloy foil is identical with the method for embodiment 1 with the evaluation method of resulting alloy foil.
It is the results are shown in table 3,4.
(from the evaluation of alloy foil)
As shown in table 3, satisfy scope of the present invention as No.101～110 of embodiment, so intensity and unit elongation excellence.
On the other hand, No.111 as a comparative example～119 are because be discontented with the unabridged version scope of invention, so cause following result.
No.111 is because Si content surpasses higher limit, so the Al-Mn-Si series intermetallic compound forms in a large number, recrystallization is hindered, so crystal grain diameter is thick, and subgrain quantity is lower than lower value.Therefore extend rate variance.No.112 is lower than lower value because of Mn content, so tensile strength is low, and intensity difference.
No.113 is because Fe content is lower than lower value, so crystal grain diameter is thick, subgrain quantity is lower than lower value.Therefore extend rate variance.In addition, tensile strength is low, intensity difference.Hole so produce thick intermetallic compound, takes place because Fe content surpasses higher limit in No.114 in the rolling way of paper tinsel.Therefore, it is rolling to continue paper tinsel.
No.115 is lower than lower value because of Cu content, so tensile strength is low, and intensity difference.No.116 is because Cu content surpasses higher limit, so intensity is too high, the reduction of the rolling property of paper tinsel can not be rolled down to the thickness of 112 μ m.
No.117 is lower than lower value because of Mn content, so tensile strength is low, and intensity difference.No.118 is because Mn content surpasses higher limit, so produce thick intermetallic compound, the reduction of the rolling property of paper tinsel can not be rolled down to the thickness of 12 μ m.
No.119 is because Mn content surpasses higher limit, so intensity is too high, the reduction of the rolling property of paper tinsel can not be rolled down to the thickness of 12 μ m.
(based on the evaluation of manufacture method)
As shown in table 4, satisfy scope of the present invention as No.120～125 of embodiment, so intensity and unit elongation excellence.
On the other hand, No.126 as a comparative example～135 are because be discontented with the unabridged version scope of invention, so cause following result.
No.126 is because process annealing is batch-type, so can not get fine crystal grain during process annealing, subgrain growth when paper tinsel is rolling, merges, and can't obtain sufficient quantity.It is also insufficient to process the solidified degree in addition.In addition, process annealing thickness and total cold rolling rate are insufficient.Therefore tensile strength is low, intensity difference, and subgrain quantity is lower than lower value in addition, extends rate variance.No.127 is insufficient because of process annealing thickness and total cold rolling rate, so tensile strength is low, and intensity difference.No.128 is because process annealing is batch-type, so can not get fine crystal grain during process annealing.Therefore subgrain growth, merging when paper tinsel is rolling can't obtain sufficient quantity, and subgrain quantity is lower than lower value, extends rate variance.It is also insufficient to process the solidified degree in addition, and tensile strength is low, intensity difference.
No.129 is because process annealing thickness is blocked up, so the reduction of the rolling property of paper tinsel can not be rolled down to the thickness of 12 μ m.In addition, because it is too high to arrive temperature, so surface indentation takes place in manufacturing process.Also have, total cold rolling rate is for finishing the value in the rolling moment.No.130 is low excessively because arrive temperature, thus can't be through process annealing and recrystallization, and subgrain quantity is lower than lower value.Therefore, extend rate variance.In addition, tensile strength is high slightly.Also have, the height of tensile strength is the degree a little more than higher limit of the present invention, therefore can be rolled down to the thickness of 12 μ m with great difficulty.No.131 is insufficient because of process annealing thickness and total cold rolling rate, so tensile strength is low, and intensity difference.
No.132 is insufficient because of process annealing thickness and total cold rolling rate, so tensile strength is low, and intensity difference.No.133 is low excessively because arrive temperature, thus can't be through process annealing and recrystallization, and subgrain quantity is lower than lower value.Therefore, extend rate variance.In addition, tensile strength is high slightly.Also have, the height of tensile strength is the degree a little more than higher limit of the present invention, therefore can be rolled down to the thickness of 12 μ m with great difficulty.No.134 is because insufficient to the cold rolling rate of process annealing, so crystal grain diameter is thick, subgrain quantity is lower than lower value.Therefore, extend rate variance.In addition, tensile strength is low, intensity difference.No.135 is based on the alloy foil as TOHKEMY 2003-150651 number record of prior art, and therefore, though excellent strength, subgrain quantity is lower than lower value, extends rate variance.
More than, example embodiment and embodiment, have been described in detail with aluminium alloy hard paper tinsel for battery current collector of the present invention, but aim of the present invention is not limited by aforesaid content.Also have, content of the present invention also can change and change etc. widely based on aforesaid record.
Claims (4)
1. a battery current collector is characterized in that with aluminium alloy hard paper tinsel contain Mn:0.8～1.5 quality %, Cu:0.05～0.20 quality %, Fe:0.3～0.7 quality %, surplus is made of Al and unavoidable impurities,
Described battery current collector is 9～20 μ m with the thickness of aluminium alloy hard paper tinsel,
Subgrain is having on the thickness direction more than 30,
Tensile strength is 280～350MPa, and unit elongation is more than 3.5%.
2. a battery current collector is characterized in that with aluminium alloy hard paper tinsel,
Make via overlapping rolling,
Contain Mn:0.8～1.5 quality %, Cu:0.05～0.20 quality %, Fe:0.3～0.7 quality %, surplus is made of Al and unavoidable impurities,
Described battery current collector is 9～15 μ m with the thickness of aluminium alloy hard paper tinsel,
Subgrain quantity is being more than 30 on the thickness direction,
Tensile strength is 280～350MPa, and unit elongation is more than 1.0%.
3. battery current collector according to claim 1 and 2 is characterized in that with aluminium alloy hard paper tinsel, also contains at least a among following of the following and Si:0.6 quality % of Mg:0.2 quality %.
4. battery current collector according to claim 1 and 2 is characterized in that with aluminium alloy hard paper tinsel, also contains at least a among following of the following and Zn:0.3 quality % of Cr:0.2 quality %.
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| CN104220614A (en) * | 2012-03-29 | 2014-12-17 | 株式会社Uacj | Aluminum alloy foil for electrode current collector and method for manufacturing same |
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| KR20110034562A (en) | 2011-04-05 |
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