CN102199716B - Aluminium hard foil for battery collector - Google Patents
Aluminium hard foil for battery collector Download PDFInfo
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- CN102199716B CN102199716B CN2011100766089A CN201110076608A CN102199716B CN 102199716 B CN102199716 B CN 102199716B CN 2011100766089 A CN2011100766089 A CN 2011100766089A CN 201110076608 A CN201110076608 A CN 201110076608A CN 102199716 B CN102199716 B CN 102199716B
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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
The invention provides an aluminium hard foil for a battery collector, which has a strength of a certain degree and good stretching rate. The aluminium hard foil for a battery collector with low resistance has 0.2-0.7 mass% of Fe, 0.1-0.5mass% of Mn. Si is controlled to be under 0.2mass%, and the remain is A1 and inevitable impurities and the purity is over 99.0mass%. The thickness of the aluminium hard foil is 9-20Mum, the amount of subgrains in the thickness direction is over 30, and the tensile strength is over 200MPa and below 270MPa and the stretching rate is over 4.0%.
Description
Technical field
The present invention relates to the battery current collector fine aluminium hard paper tinsel as the positive electrode collector use of lithium-ion secondary cell.
Background technology
In recent years, use lithium-ion secondary cell as Move tools such as mobile phone or notebook computers with power supply.The battery material of this lithium-ion secondary cell is formed by anodal material, dividing plate and negative pole material.And the manufacturing of anodal material is the LiCoO that uses the two sided coatings 100 μ m thickness degree of aluminium foil (or alloy foil) at the current collector of 15 μ m thickness degree
2The isoreactivity material for the solvent in the active substance of removing this coating carries out drying, increases the pressing of density of active substance, through otch, severing operation and carry out.This current collector material is for example used the raffinal foil shown in patent documentation 1.
But, in recent years, because the progress of cell high-capacityization, in order to realize the thin-walled property of employed aluminium foil, the alloy foil that desired strength is high.Disclosed content in the non-patent literature 1 for example, as existing widely used fine aluminium 1085,1N30 etc., be 172～185MPa for tensile strength, the extensibility value is 1.4～1.7%, as 3003 alloys etc. by adding Mn, can access tensile strength is 270～279MPa, and the extensibility value is 1.3～1.8% alloy foil, realizes more high strength and Geng Gao extensibility.
In addition, following technology has for example been proposed in patent documentation 2.That is, when having proposed to use hard active substance, and when being accommodated in the cell box, have at volume and be the position of the little radius of (bending) Vorticose electrode material disrumpent feelings tendency easily.Therefore, be in the Alloy Foil at Al-Mn, contain Cu in a large number, during regulation thickness of slab when cold rolling, use continuous annealing furnace to carry out process annealing in prescribed condition, thus, form the intensity of 280～380MPa, improve resistance to bend(ing).
In addition, for example in patent documentation 3, propose in alloy foil, to add Mg, Co, Zr, W etc., formed the intensity of 240～400MPa, obtained extensibility and erosion resistance.
And in non-patent literature 2, disclose as general characteristic, as fine aluminium 1085 in, electric conductivity is 61.5%IACS, with 3003 alloy phases that add Mn than high by 48.5% (resistance value is low).Because this high conductivity, the pure aluminum foil that is preferred for electrical component still is extensive use of.Also have, electric conductivity according to alloying element with modified (working modulus) and different, disclosed as non-patent literature 3, in the thickness more than 6mm, under the situation of 1070 materials that purity is high etc., soft (O) material is 62%, hard (H18) material is 61%, under 3003 the situation, soft material is 50%, and the hard material is 40%.Be that Mn is that alloy declines to a great extent owing to applying the processing electric conductivity.
Patent documentation 1: the spy opens flat 11-162470 communique (paragraph 0023)
Patent documentation 2: the spy opens 2008-150651 communique (paragraph 0003,0005～0007)
Patent documentation 3: the spy opens 2009-64560 communique (paragraph 0016～0029)
Non-patent literature 1: " 2008 up-to-date battery technology complete works ", the Electricity ジ ヤ of Co., Ltd. one Na Le, distribution on May 1st, 2008, the 8th piece of the 1st chapter the 7th joint, P243
Non-patent literature 2:Furukawa-Sky Review, No.5,2008 P5 tables 1, P9 Fig. 8
Non-patent literature 3: aluminium handbook, Japanese aluminium association, distribution on January 31st, 2007, P32, table 4.2
But in existing aluminium foil or alloy foil, there are the following problems.
In aluminium foil and alloy foil, along with intensity rising thickness reduces, it is known that extensibility (ductility) descends.Also have, foregoing also clearly is documented in the non-patent literature 1.
But, the electrode material make the pressing of line, otch etc. in the operation, even high strength but extensibility are after a little while, foil becomes crisp state, and foil is disrumpent feelings on the manufacturing line, and the problem that operating line stops to take place, therefore, when paying attention to intensity, also require to pay attention to extensibility.And in the alloy foil for high strength heavy addition Mn, as the record of non-patent literature 2, existing because resistance is big, so the not preferred problem of using as the battery after the assembling.
Summary of the invention
The present invention puts in view of the above problems and does, and its problem is, the intensity that has to a certain degree is provided, and has excellent extensibility, and, the battery current collector that resistance is low aluminium hard paper tinsel.
In order to solve described problem, present inventors study following item.
For the high strength of foil, be well known that and add Mg, Mn, Cu etc. that this also is used in the motion of described prior art.But, increase also the unknown of method of the ductility (extensibility) of thin-walled hard paper tinsel.In addition, in thin or 8021 Alloy Foil of fine aluminium, on the point of high strength and extensibility, electric conductivity is also insufficient.Usually known have, and when making the fine aluminium thin-walled paper tinsel of 1N30 etc., by the solid solution in the manufacturing process of material, separate out the control of control and paper tinsel rolling condition, the material structure before making final paper tinsel rolling forms the subgrain tissue, thus, can make the few thin foil of pin hole.This structural state extensibility is than higher, and therefore, if subgrain can be controlled to be finely, it is higher then to access strength ratio, the foil of high ductibility.
Usually known have, and when observing the material structure of foil by infiltration type electron microscope etc. from face side, subgrain is the diameter about 2 μ m, but be not to be the observation that the cross section of the foil of the thickness about 15 μ m is carried out.Therefore, each factor of the extensibility that influences the hard paper tinsel has been carried out research with keen determination, it found that the crystal grain of thickness direction (subgrain) is relevant with extensibility, the subgrain observation condition in the cross section by new establishment foil, and realization the present invention.That is to say, no matter found the hard paper tinsel of which kind of state, directly is not change about 2 μ m from the subgrain of surface observation, and the subgrain footpath (thickness) in cross section is (the subgrain number of the foil thickness direction that 15 μ m are thick is about 5～10) about 1.5～3 μ m.Thus, present inventors find, because the subgrain of thickness direction is few in the prior art, so be inhomogeneous distortion, the state that extensibility is low is made as many by the subgrain numerical control with thickness direction, in tensile deformation etc., can be out of shape uniformly, obtain high extensibility, thereby realize the present invention.Crystal grain diameter when the subgrain of also finding thickness direction is process annealing is rolled, and grows up, forms from the layer of attenuation, forms a large amount of subgrains in order to make thickness direction, and number of die and solid solution condition during control process annealing be prerequisite.
In addition, when present inventors found to measure the electric conductivity of actual foil, owing to be thin hard paper tinsel, different with the numerical value of record in the non-patent literature 1,2, actual electric conductivity was lower.
So, though always proposed to add for high strength the Alloy Foil (Al purity: be lower than 99.0 quality %) of alloying element, the present invention at the category of fine aluminium, realizes high strength, high extensibilityization in order to control, reduce resistance.
That is to say, battery current collector of the present invention fine aluminium hard paper tinsel (below, be also referred to as aluminium foil) be to contain Fe:0.2～0.7 quality %, Mn:0.1～0.5 quality %, Si is controlled below 0.2 quality %, surplus is Al and unavoidable impurities, purity is the above battery current collector of 99.0 quality % fine aluminium hard paper tinsel, wherein, described battery current collector is 9～20 μ m with the thickness of fine aluminium hard paper tinsel, subgrain is more than 30 at thickness direction, tensile strength is to be lower than 270MPa more than the 220MPa, and extensibility is more than 4.0%.
Constitute according to this, by adding the Fe of specified amount, crystal grain miniaturization during process annealing by adding Fe, the Mn of specified amount, improves the intensity of aluminium foil, and tensile strength is to be lower than 270MPa more than the 220MPa, has full intensity as aluminium.In addition, be below the 0.5 quality % by making Mn content, can access the electric conductivity more than 50%, have sufficient characteristic as battery current collector.In addition, by with Si control below specified amount, the intermetallic compound of Al-Fe system is difficult to become thick α-Al-Fe-Si series intermetallic compound, so extensibility can not descend, crystal grain diameter can be not thick, thickness direction can access sufficient subgrain number.In addition, be 9～20 μ m by making thickness, can form the aluminium foil that is suitable for as battery current collector.In addition, be more than 30 by the subgrain number that makes thickness direction, the extensibility of aluminium foil improves, and extensibility is more than 4.0%.
Battery current collector of the present invention with fine aluminium hard paper tinsel contain also that Cu:0.05 quality % is following, Mg:0.05 quality % more than one in following.
Constitute according to this, by adding at least a of Cu and Mg, can improve intensity, and this moment, extensibility can not descend by Cu being controlled to be the addition below the specified amount, by Mg also being controlled to be the addition below the specified amount, extensibility and electric conductivity can not descend.
Battery current collector of the present invention is more than 50% (IACS) with fine aluminium hard paper tinsel electric conductivity.
Constitute according to this, improve the efficient of battery when using as battery.
Battery current collector of the present invention fine aluminium hard paper tinsel, even the thin-walled of 9～20 μ m also has high strength as fine aluminium, therefore, resistance is also low, can realize the high capacity of lithium-ion secondary cell.In addition, extensibility is also excellent, therefore, in the manufacturing process of electrode material, can prevent that foil is disrumpent feelings, prevents from making accidents such as line stops and taking place.
Description of drawings
Fig. 1 is the image for the measuring method of the subgrain number of explanation embodiment, (a) is the orientation reflection of the parallel cut of one of embodiment, (b) is its colour coding (legend).
Fig. 2 is the image for the measuring method of the subgrain number of explanation embodiment, (a) is the orientation reflection of the parallel cut of one of comparative example, (b) is its colour coding.
Embodiment
Below, illustrate and be used for to realize that battery current collector of the present invention is with the embodiment of fine aluminium hard paper tinsel (below, be also referred to as aluminium foil).
Aluminium foil of the present invention contains Fe, the Mn of specified amount, and Si content is suppressed at below the specified amount, and surplus is Al and unavoidable impurities, and purity (aluminium purity) is more than the 99.0 quality %.And the thickness of this aluminium foil is 9～20 μ m, and in this thickness direction, subgrain exists more than 30.In addition, tensile strength is to be lower than 270MPa more than the 220MPa, and extensibility is more than 4.0%.In addition, aluminium foil can also contain the Cu of specified amount, among the Mg more than one.And the blank foil electric conductivity is more than 50%.
Below, each formation is described.
(Fe:0.2～0.7 quality %)
Fe is the crystal grain miniaturization during for process annealing, is used in addition improving intensity by solution strengthening, still is used for the subgrain stabilization and the element that adds.When Fe content was lower than 0.2 quality %, crystal grain diameter was thick, and thickness direction can not obtain sufficient subgrain number, in addition, also was difficult to obtain full intensity.In addition, in the category more than aluminium purity 99.0 quality %, when Fe content surpassed 0.7 quality %, Mn content tailed off thereupon, subgrain zoarium, thickization, and thickness direction can not obtain sufficient subgrain number, in addition, also is difficult to obtain full intensity.In addition, electric conductivity descends.Therefore, Fe content is 0.2～0.7 quality %.
(Mn:0.1～0.5 quality %)
Mn is for improving intensity by solution strengthening, AlFeMn compound or AlFeMnSi compound are formed in a large number, being used for making stable formation of subgrain and the element of interpolation.When Mn content is lower than 0.1 quality %, intensity, be, extensibility is insufficient.In addition, when surpassing 0.5 quality %, electric conductivity descends.In addition, be more than the 99.0 quality % in order to make aluminium purity, along with the increase Fe content of Mn reduces, both descend at the extensibility that is harmonious.Therefore, Mn content is 0.1～0.5 quality %.
(Si:0.2 quality % is following)
Si is the element of sneaking into easily as unavoidable impurities.When Si content surpassed 0.2 quality %, the Al-Fe series intermetallic compound became thick α-Al-Fe-Si series intermetallic compound easily, is difficult to obtain extensibility.In addition, because the distribution density of intermetallic compound reduces, it is thick that crystal grain diameter becomes, and thickness direction can not obtain sufficient subgrain number.Therefore, Si content is below the 0.2 quality %.Also have Si also can be 0 quality %.
(Cu:0.05 quality % is following)
Cu improves the preferred element of intensity, can add.But when surpassing 0.05 quality %, extensibility descends.Therefore, the Cu content during interpolation is below the 0.05 quality %.
(Mg:0.05 quality % is following)
Mg improves the preferred element of intensity, can add.But when surpassing 0.05 quality %, extensibility descends, and electric conductivity descends.Therefore, the Mg content during interpolation is below the 0.05 quality %.
In addition, for the miniaturization of ingot structure, the situation of adding the Al-Ti-B master alloy is arranged also.Namely can say Ti: B=5: 1 or the ingot casting miniaturization agent of 5: 0.2 ratios add to liquation (liquation in arbitrary stage that dissolving stove, inclusion strainer, de-gassing vessel, the liquid inventory control device before solidifying to slag drops into) with waffle (ワ Star Off Le) or bar-shaped form, the Ti amount allows to contain the amount of 0.05 quality %.
(surplus: Al and unavoidable impurities)
The composition of aluminium foil is made of Al and unavoidable impurities except above-mentioned.And the purity of aluminium is more than the 99.0 quality %.Also have, can allow respectively to contain from Cr, Zn as unavoidable impurities, Ga, the V in the generally well-known scope that contains in base material and master alloy, Ni etc. be up to 0.05 quality %.
(thickness: 9～20 μ m)
In order to strengthen the cell container of lithium-ion secondary cell, the thickness of aluminium foil is thin as much as possible, but makes the high strength foil difficulty that is lower than 9 μ m.In addition, when surpassing 20 μ m, the electrode material that in the case that determines volume, can not pack into a large amount of, cell container descends.Therefore, the thickness of aluminium foil is 9～20 μ m.
(the subgrain number of thickness direction: more than 30)
In order to increase the extensibility that thickness is the aluminium foil of 9～20 μ m, the subgrain number that needs thickness direction is (paper tinsel of 15 μ m is thick, and subgrain diameter (thickness) is that 0.5 μ m is following) more than 30.When the subgrain number of thickness direction is lower than 30, can not obtain the extensibility of sufficient aluminium foil.In addition, the subgrain number is The more the better, and the upper limit is not particularly limited.In addition, as mentioned above, be rolled because the subgrain of thickness direction is crystal grain diameter when process annealing, grow up, be shaped from the layer of attenuation, so this layer need be for more than 30 layer.And the recrystallize grain when this means process annealing is more than 30 at thickness direction.
Then, the establishment to the measuring method of the subgrain number of thickness direction describes.
At first, aluminium foil is cut to about 5 * 10mm, uses the electroconductibility band, the foil of this cut-out is sticked on the thin plate basal disc in the mode that foil becomes the state that exposes a little.Then, cut off the part of this foil with FIB (Focused Ion Beam) device, observe parallel cut.Also have, by the method for imbedding resin commonly used, resin portion perk when SEM (scanning electron microscope) observes (チ ヤ one ジ ア Star プ) is difficult to measure.And, for this cross section, be * 2000 times by SEM to observe multiplying power, carry out EBSD (Electron Back Scatter Diffraction) and resolve, obtain the orientation reflection.Also have, for from surface observation, resolve software and show automatically from the orientation reflection of the ND face of surface observation usually.In parsing, be the observation of parallel cut (RD-TD face), be rotated operation to obtain from the orientation reflection of the ND face of RD-ND face observation.And, by this orientation reflection (with reference to Fig. 1) that obtains, calculate the subgrain number by method of bisector.Specific as follows described.Subgrain is that intercrystalline inclination angle is 0～15 °, and identical subgrain color is identical.And 0 ° of color is the denseest, and 15 ° of colors are the most shallow.According to this situation, use the colour coding of the relation of Show Color and crystal orientation, judge intercrystalline inclination angle and color from orientation reflection (orientation map) by naked eyes, calculate subgrain.
(tensile strength: be lower than 270MPa more than the 220MPa)
When tensile strength is lower than 220MPa, insufficient as the intensity of aluminium foil.And when 270MPa is above, needing to add a large amount of alloying elements, electric conductivity and extensibility descend.Therefore, tensile strength is to be lower than 270MPa more than the 220MPa.
(extensibility: more than 4.0%)
Need with the more excellent extensibility of the poor slightly amount of Alloy Foil phase specific tenacity.Extensibility is lower than at 4.0% o'clock, and battery current collector adds problems such as easy generation cut-out in man-hour.Therefore, extensibility is more than 4.0%.Also have, extensibility is more high more good.
The mensuration of tensile strength and extensibility uses the Type B test film to carry out according to Light Metal Industrial Standard LIS AT5.Namely cut out the billet type test film of the about 200mm of width 15mm * length from aluminium foil in the mode parallel with rolling direction, to implement as distance between punctuating and annotating apart from 100mm between chuck.Can use in test the オ リ エ of Co., Ltd. Application テ Star Network テ Application processed シ ロ Application universal testing machine model: RTC-1225A.
(electric conductivity: more than 50%)
Owing to use as electric component, so need resistance low.The resistance height is that electric conductivity is lower than at 50% o'clock, and is low as battery Use Limitation rate.Therefore, electric conductivity is more than 50%.Also have, electric conductivity is more high more good.
Also have, by forming formation of the present invention, in the thickness of 9～20 μ m, can access the electric conductivity more than 50%, have sufficient characteristic as battery current collector.
Then, mensuration (calculating) method to electric conductivity describes.This mensuration is according to JISC2525, uses the ア Le バ Star Network resistance measurement device processed TER-2000RH of science and engineering Co., Ltd., measures resistance according to direct current 4 terminal methods.
Specifically, at first, the foil of specific thickness is cut to prescribed level, at two ends spot welding Ni line, measures resistance by 4 terminal methods.The resistance R of test film is tried to achieve according to R=V/I from the electric current I of the test portion of flowing through and the potential difference V between voltage terminal.The electric current I basis is obtained with the voltage decline of the standard resistance (0.1 Ω) that test film is connected in series.The voltage decline of test film and standard resistance and an electric power of R thermopair use the digital determinator that detects sensitivity ± 0.1 μ V to try to achieve.And electric conductivity is obtained by following formula.
Volume resistance ρ=R (A/L)
Electric conductivity γ (%IACS)=1.7241[μ Ω cm]/volume resistance ρ [μ Ω cm] } * 100
A: test portion sectional area
L: determination part length
1.7241[μ Ω cm]: the volume specific resistance of standard annealed copper
(manufacture method of aluminium foil)
Then, the manufacture method to aluminium foil describes.The manufacture method of aluminium foil homogenizes after thermal treatment, the hot rolling to the fine aluminium ingot casting by prescriptive procedure, carries out cold rolling, process annealing under prescribed condition, carries out cold rollingly thereafter, carries out thus.
In aluminium foil, in order to obtain a large amount of subgrains, preferably by carrying out process annealing, the crystal grain diameter when making process annealing is fine.Therefore, preferred cold working rate (cold rolling rate) height till the process annealing, preferred cold rolling rate more than 30%.In addition, in order to improve intensity, preferred cold rolling rate more than 30%.But the cold rolling rate till process annealing surpasses at 85% o'clock, and effect is saturated, and is unfavorable economically, therefore is preferably below 85%.
It is high cold rolling rate after the process annealing, need further to promote subgrainization as aluminium foil, and, particularly need to improve intensity, therefore, the cold rolling rate after the preferred process annealing is more than 98.5% from annealing back, centre to the vertical cold rolling rate that forms final aluminium foil (final product) namely.Also have, aluminium foil is in order to obtain high strength, and the thickness of slab during preferred process annealing is more than the 1mm.But when carrying out process annealing with the thickness that surpasses 2mm, intensity is too high, and therefore the foil rolling difficulty, is preferably below the 2mm.Also have, in order to carry out foil rolling easily, even the absolute value of intensity be the high value, in the foil thickness below about 100 μ m thickness, it is few to be preferably work hardening.
At this, in the process annealing, form more than 30, namely for the subgrain number that makes thickness direction is more than 30, by the continuous annealing furnace annealing in order to make recrystallize grain diameter at thickness direction.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 ℃, recrystallize can not fully carry out, and subgrain is counted deficiency, and the solid solution degree is insufficient.And when surpassing 550 ℃, recrystallize and solid solution effect are saturated, and, the easy deterioration of appearance.In addition, warming and cooling rate gets final product in the scope of the usual method of continuous annealing, but in batch annealing, even in the scope of usual method, carries out but add to pine for separating out, the zoarium of subgrain, thickization generation during foil rolling, and therefore, subgrain is counted deficiency.In addition, the degree of work hardening is also insufficient, strength degradation.Also have, the situation of continuous annealing, heat-up rate is 1～100 ℃/second, cooling rate is 1～500 ℃/second, in the scope of usual method.The situation of batch annealing, heat-up rate is 20～60 ℃/hour, any suitable stove of cooling rate is cold, it is cold to put, forced air-cooling etc., meets their condition.
And for solid solution, the preferred hold-time is long, but owing to be continuous annealing furnace, surpass 1 minute and keep line speed significantly to descend, and is unfavorable economically.
Number of die, solid solution condition when so, the subgrain number of thickness direction can be by composition range, process annealing are controlled.
Embodiment
More than, be illustrated being used for implementing mode of the present invention.Below, the embodiment by relatively realizing effect of the present invention and the comparative example of discontented unabridged version invention condition describe particularly.Also have, the present invention is not limited to this embodiment.
(making for the examination material)
(embodiment No.1～6, comparative example No.7～16)
The aluminium of forming shown in the table 1 is fused, casts as ingot casting, after this ingot casting enforcement face cutting, 540 ℃ of thermal treatments that homogenize of carrying out 4 hours.To this ingot casting that has carried out homogenizing carry out hot rolling, again carry out cold rolling after, carry out process annealing, thereafter, single roller is rolled down to the thickness of 15 μ m, forms aluminium foil.The condition of process annealing is 450 ℃ of annealing temperatures in continuous annealing furnace, 10 ℃/second of heat-up rates, 20 ℃/second of cooling rates, 5 seconds hold-times.The thickness of the plate after the hot rolling (foil) is 3.0mm, the thickness of the plate (foil) before the process annealing be 1.6mm (the cold rolling rate before the process annealing: about 47%, the cold rolling rate after the process annealing (total cold rolling rate): about 99.1%).
(embodiment No.18～20, comparative example No.21～26)
The aluminium of forming (corresponding to composition A, B, the C of table 1) shown in the table 2 is fused, casts as ingot casting, after this ingot casting enforcement face cutting, 540 ℃ of thermal treatments that homogenize of carrying out 2 hours.To this ingot casting that has carried out homogenizing carry out hot rolling, again carry out cold rolling after, carry out process annealing, thereafter, single roller is rolled down to the thickness of 15 μ m, forms aluminium foil.Process annealing, cold rolling condition are as shown in table 2.Also have, during continuous annealing (CAL), heat-up rate is 10 ℃/second, 20 ℃/second of cooling rates, and during batch annealing (BACH), heat-up rate is 40 ℃/hour, cooling rate is 80 ℃/hour (putting cold).In addition, the not big variation of the value of total cold rolling rate.
(making for the examination material)
(embodiment No.27～32, comparative example No.33～39)
The aluminium of forming shown in the table 3 is fused, casts as ingot casting, after this ingot casting enforcement face cutting, 540 ℃ of thermal treatments that homogenize of carrying out 4 hours.To this ingot casting that has carried out homogenizing carry out hot rolling, again carry out cold rolling after, carry out process annealing, thereafter, two rolling systems in the final road by foil rolling are cold rolled to the thickness of 15 μ m, form aluminium foil.The condition of process annealing is 450 ℃ of annealing temperatures in continuous annealing furnace, 10 ℃/second of heat-up rates, 20 ℃/second of cooling rates, 5 seconds hold-times.The thickness of the plate after the hot rolling (foil) is 3.0mm, the thickness of the plate (foil) before the process annealing be 1.6mm (the cold rolling rate before the process annealing: about 47%, the cold rolling rate after the process annealing (total cold rolling rate): about 99.1%).
(embodiment No.40～42, comparative example No.43～48)
The aluminium of forming shown in the table 4 (A of correspondence table 3, B, C) is fused, casts as ingot casting, after this ingot casting enforcement face cutting, 540 ℃ of thermal treatments that homogenize of carrying out 2 hours.To this ingot casting that has carried out homogenizing carry out hot rolling, again carry out cold rolling after, carry out process annealing, thereafter, two rollings refrigeration in the final road by foil rolling are rolled down to the thickness of 12 μ m, form aluminium foil.Process annealing, cold rolling condition are as shown in table 4.Also have, during continuous annealing (CAL), 10 ℃/second of heat-up rates, 20 ℃/second of cooling rates, during batch annealing (BACH), 40 ℃/hour of heat-up rates, 80 ℃/hour of cooling rates (putting cold).In addition, the not big variation of the value of total cold rolling rate.
Table 1 is shown as and is grouped into, and table 2 shows creates conditions.Also have, the underscore of numerically drawing of creating conditions of discontented unabridged version scope of invention and discontented unabridged version invention shows in the table, the composition that does not contain and not carrying out being represented by "-" of process annealing.In addition, No.14 is 3003 Alloy Foil, and No.15 is 1085 paper tinsels (high purity paper tinsels).In addition, No.16 is the Alloy Foil (embodiment 1 of table 1) of record in the citing document 2.In addition, the thickness of the plate in the table 2 after the hot rolling is designated as hot rolling and finishes thickness, and the thickness of the plate before the process annealing is designated as process annealing thickness.
Also have, No.17 is the high purity paper tinsel (embodiment 3 of table 1) of record in the citing document 1, shows as reference.
At this, No.17 is the clear and definite composition of record in the citing document 1, and except Al purity: the 99.7 quality %, contain Cu:30ppm, Fe:1500ppm, Si:500ppm element, other what element that also contains which kind of degree can not be differentiated.In addition, the thickness that only records aluminium foil in citing document 1 is 15 μ m, without any about the process annealing condition, and the record of the having or not of the black annealing after dissolving casting, face cutting and the heat-treat condition that homogenizes in the creating conditions of aluminium foil, hot-rolled condition, the hot rolling, cold rolling condition etc.Therefore, owing to can not reproduce the high purity foil of record in the documents 1, so can't obtain the data of electric conductivity, subgrain number and extensibility.
Thus, owing to be difficult to the high purity foil of record in the present invention and the citing document 1 is directly contrasted, so having the No.15 that is equivalent to the composition of the high purity foil of record in the citing document 1, making compares for examination material and prior art.
(subgrain number)
Then, measure the subgrain number of the thickness direction of aluminium foil by the following method.
At first, aluminium foil is cut to about 5 * 10mm, uses the electroconductibility band, the foil of this cut-out is sticked on the thin plate basal disc in the mode that foil becomes the state that exposes a little.Then, cut off the part of this foil with FIB (Focused Ion Beam) device, observe parallel cut.And, for this cross section, be * 2000 times by scanning electron microscope to observe multiplying power, carry out EBSD (Electron Back Scatter Diffraction) and resolve, obtain the orientation reflection.Also have, for from surface observation, resolve software and show automatically from the orientation reflection of the ND face of surface observation usually.In parsing, be the observation of parallel cut (RD-TD face), be rotated operation to obtain from the orientation reflection of the ND face of RD-ND face observation.And, according to this orientation reflection, calculate the subgrain number by method of bisector.
Its result shows in table 1,2.Also have, in Fig. 1 (a), show the orientation reflection of the parallel cut of embodiment No.18, in Fig. 1 (b), show colour coding.In addition, in Fig. 2 (a), show the orientation reflection of the parallel cut of comparative example No.21, in Fig. 2 (b), show colour coding.According to this orientation reflection, calculate the subgrain number by method of bisector.
At this, intercrystalline inclination angle is below 15 ° to be subgrain, and identical subgrain color is identical.Also have, the pass of color and crystal orientation ties up in the colour coding and shows.In addition, subgrain is that intercrystalline inclination angle is 0～15 °, and 0 ° of color is the denseest, and 15 ° of colors are the most shallow.According to this situation, judge the orientation reflection by naked eyes, calculate subgrain.Also have, the location of subgrain is tiny area, and how much different subgrain is according to number of positions, in the instrumentation of thickness direction, and at this, the quantity at the minimum position of instrumentation.
(electric conductivity)
Then, measure the electric conductivity of aluminium foil by the following method.This mensuration is according to JISC2525, uses the ア Le バ Star Network resistance measurement device processed TER-2000RH of science and engineering Co., Ltd., measures resistance according to direct current 4 terminal methods.
Specifically, at first, the foil of specific thickness is cut to width 3mm * length 80mm, at two ends spot welding Ni line, measures resistance by 4 terminal methods.The resistance R of test film is tried to achieve according to R=V/I from the electric current I of the test portion of flowing through and the potential difference V between voltage terminal.The electric current I basis is obtained with the voltage decline of the standard resistance (0.1 Ω) that test film is connected in series.The voltage decline of test film and standard resistance and an electric power of R thermopair use the digital determinator that detects sensitivity ± 0.1 μ V to try to achieve.And electric conductivity is obtained by following formula.
Volume resistance ρ=R (A/L)
Electric conductivity γ (%IACS)=1.7241[μ Ω cm]/volume resistance ρ [μ Ω cm] } * 100
A: test portion sectional area
L: determination part length
1.7241[μ Ω cm]: the volume specific resistance of standard annealed copper
(evaluation)
Resulting aluminium foil is carried out following evaluation.
(intensity and extensibility)
The mensuration of tensile strength and extensibility uses the Type B test film to carry out according to Light Metal Industrial Standard LIS AT5.Namely cut out the billet type test film of the about 200mm of width 15mm * length from aluminium foil in the mode parallel with rolling direction, to implement as distance between punctuating and annotating apart from 100mm between chuck.Can use in test the オ リ エ of Co., Ltd. Application テ Star Network テ Application processed シ ロ Application universal testing machine model: RTC-1225A.By this test determination tensile strength and extensibility.The criterion of acceptability of intensity is tensile strength 220～270MPa, and the criterion of acceptability of extensibility is more than 4.0%.
These results show in table 1,2.Also have, tensile strength, extensibility, electric conductivity do not satisfy criterion of acceptability in the table, at the following underscore of strokeing of numerical value, among the No.17, can not put down in writing the usefulness "-" of the numerical value of each characteristic and represent.
Table 1
* surplus is unavoidable impurities (Rem. (surplus) comprises unavoidable impurities)
No.14 is 3003 alloys
No.15 is the high purity paper tinsel
No.16 is 3003 to be Alloy Foil (opening the 2008-150651 communique based on the spy)
No.17 is high purity paper tinsel (opening flat 11-162470 communique based on the spy)
Table 2
Table 3
Table 4
(evaluation of carrying out based on aluminium foil)
As shown in table 1, owing to satisfy scope of the present invention, so intensity and extensibility excellence, electric conductivity also is more than 50% as No.1～6 of embodiment and No.27～32.
And No.7 as a comparative example～16 and No.33～39 are owing to discontented unabridged version scope of invention, so following result occurs.
No.7 and No.33 are because Si content surpasses higher limit, so α-thickization of Al-Fe-Si series intermetallic compound, crystal grain diameter is thick, and the subgrain number is lower than lower value, and in addition, foil cuts off easily, the stretching rate variance.
NO.8 and No.34 are because Fe content is lower than lower value, and crystal grain diameter is thick, and the subgrain number is lower than lower value.Therefore, stretching rate variance.In addition, intensity is also poor.No.9 and No.35 are because Fe content surpasses the upper limit, though rolling property excellence, subgrain zoarium, thickization, as a result of the subgrain of thickness direction is counted deficiency, the stretching rate variance.In addition, intensity is also poor.And electric conductivity descends.
No.10 and No.36 be because Cu content surpasses higher limit, so though the intensity height, the stretching rate variance.No.11 and No.37 are lower than lower value owing to Mn content, thus can not form sufficient subgrain, in addition, the solid solution element deficiency, therefore, intensity and stretching rate variance.No.12 and No.38 are because Mn content surpasses higher limit, so electric conductivity descends.In addition, stretching rate variance.No.13 and No.39 are because Mg content surpasses higher limit, so electric conductivity descends.In addition, stretching rate variance.
No.14 is 3003 Alloy Foil that contain a large amount of Mn, owing to contain Si, Cu, Mn, thus be outside the fine aluminium category, and electric conductivity declines to a great extent.In addition, owing to be 3003 Alloy Foil, so the intensity height.Also have, when containing a large amount of Mn in the Alloy Foil, form the miniaturization compound of Al-Mn-Fe-Si, therefore, can access sufficient subgrain number.Therefore, extensibility can be guaranteed more than 4.0%.No.15 is 1085 paper tinsels, and Fe content is few, does not add Mn, so subgrain is counted deficiency, and the stretching rate variance.In addition, intensity is also poor.
No.16 is that to contain 3003 of a large amount of Mn be Alloy Foil, owing to contain Si, Cu, Mn, Mg, thus be outside the fine aluminium category, and electric conductivity declines to a great extent.In addition, owing to be 3003 Alloy Foil, so the intensity height.Also have, compare with No.14 and contain Si, Cu, Mn, Mg in a large number, and Mg surpasses higher limit, so extensibility is lower than No.14, is lower than 4.0%.Though the No.17 intensity difference is same with No.15, Fe content is few, does not add Mn, so subgrain is counted deficiency, and the stretching rate variance.
(evaluation of carrying out based on manufacture method)
As shown in table 2, owing to satisfy scope of the present invention, so intensity and extensibility excellence, electric conductivity also is more than 50% as No.18～20 of embodiment and No.40～42.
And No.21 as a comparative example～26 and No.43～48 are owing to discontented unabridged version scope of invention, so following result occurs.
No.21 and No.43 be because batch during process annealing, thus can not obtain fine crystal grain during process annealing, during foil rolling subgrain grow up, zoarium, can not obtain quantity sufficient.In addition, the degree of work hardening is insufficient.In addition, process annealing thickness and total cold rolling rate are insufficient.Therefore, tensile strength) (tensile strength) the, intensity difference, in addition, the subgrain number is lower than lower value, the stretching rate variance.
No.22 and No.44 be not owing to carry out process annealing, so the state of the texture of coarse crystal when being hot rolling, tensile strength is low, intensity difference, and in addition, the subgrain number is lower than lower value, the stretching rate variance.Though No.23 and No.45 process annealing thickness are suitable, because thickization of recrystal grain diameter when being batch process annealing, foil can not obtain sufficient subgrain, the stretching rate variance.Also have, become to be grouped into total cold rolling rate and satisfy scope of the present invention, therefore, strength ratio embodiment is lower slightly, but satisfies criterion of acceptability.
No.24 and No.46 are owing to the process annealing thin thickness, and in addition, total cold rolling rate is insufficient, and therefore, the work hardening capacity during foil rolling is insufficient, intensity difference.No.25 and No.47 are low excessively owing to arriving temperature, non-recrystallization in the process annealing, and the subgrain number is lower than lower value.Therefore, stretching rate variance.In addition, the degree of solid solution is also insufficient, and intensity is also poor.NO.26 and No.48 can not obtain fine crystal grain owing to the cold rolling rate to process annealing is insufficient during process annealing, and foil forms extremely thick Asia.In addition, though process annealing thickness is thick, because insufficient to the cold rolling rate of process annealing, tensile strength is low, can not obtain abundant intensity.
Also have, No.14,15 alloy foil and aluminium foil prefer to record in patent documentation 2, the patent documentation 1 respectively, or existing aluminium foil and the alloy foil of record in the non-patent literature 11.In addition, the alloy foil of No.16 is based on the alloy foil of record in the patent documentation 2.In addition, the aluminium foil of No.17 can judge that according to the evaluation result of No.15 subgrain counts deficiency, the stretching rate variance as mentioned above.And as shown in this embodiment, these existing aluminium foils etc. do not satisfy certain level in described evaluation.Therefore, show the excellences of comparing such as aluminium foil of the present invention and existing aluminium foil objectively according to present embodiment.
More than, battery current collector of the present invention is had been described in detail by embodiment and embodiment with fine aluminium hard paper tinsel, but aim of the present invention is not limited to foregoing.Also have, content of the present invention can change widely based on above-mentioned record, change etc.
Claims (5)
1. a battery current collector is with fine aluminium hard paper tinsel, it is characterized in that, contain Fe:0.2～0.7 quality %, Mn:0.1～0.5 quality %, Si is controlled below 0.2 quality %, surplus is Al and unavoidable impurities, purity is more than the 99.0 quality %, and wherein, described battery current collector is 9～20 μ m with the thickness of fine aluminium hard paper tinsel, subgrain is more than 30 at thickness direction, tensile strength is to be lower than 270MPa more than the 220MPa, and extensibility is more than 4.0%.
2. a battery current collector is with fine aluminium hard paper tinsel, it is characterized in that, be to contain Fe:0.2～0.7 quality %, Mn:0.1～0.5 quality %, Si is controlled below 0.2 quality %, surplus is Al and unavoidable impurities, purity is more than the 99.0 quality %, the battery current collector that is made by two rolling systems is with fine aluminium hard paper tinsel, wherein, described battery current collector is 5～20 μ m with the thickness of fine aluminium hard paper tinsel, and subgrain is more than 30 at thickness direction, and tensile strength is to be lower than 270MPa more than the 220MPa, and extensibility is more than 2.0%.
3. a battery current collector is with fine aluminium hard paper tinsel, it is characterized in that, contain Fe:0.2～0.7 quality %, Mn:0.1～0.5 quality %, Si is controlled below 0.2 quality %, also contain below the Cu:0.05 quality %, the element of more than one during Mg:0.05 quality % is following, surplus is Al and unavoidable impurities, purity is more than the 99.0 quality %, wherein, described battery current collector is 9～20 μ m with the thickness of fine aluminium hard paper tinsel, and subgrain is more than 30 at thickness direction, and tensile strength is to be lower than 270MPa more than the 220MPa, and extensibility is more than 4.0%.
4. a battery current collector is with fine aluminium hard paper tinsel, it is characterized in that, be to contain Fe:0.2～0.7 quality %, Mn:0.1～0.5 quality %, Si is controlled below 0.2 quality %, also contain below the Cu:0.05 quality %, the element of more than one during Mg:0.05 quality % is following, surplus is Al and unavoidable impurities, purity is more than the 99.0 quality %, by the battery current collector fine aluminium hard paper tinsel that two rolling systems are made, wherein, described battery current collector is 5～20 μ m with the thickness of fine aluminium hard paper tinsel, subgrain is more than 30 at thickness direction, tensile strength is to be lower than 270MPa more than the 220MPa, and extensibility is more than 2.0%.
5. it is characterized in that with fine aluminium hard paper tinsel electric conductivity is more than 50% according to each described battery current collector in the claim 1～4.
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| JP5532424B2 (en) * | 2009-09-28 | 2014-06-25 | 株式会社神戸製鋼所 | Aluminum alloy hard foil for battery current collector |
| WO2013146369A1 (en) * | 2012-03-29 | 2013-10-03 | 古河スカイ株式会社 | Aluminum alloy foil for electrode current collector and method for manufacturing same |
| US9698426B2 (en) | 2012-04-24 | 2017-07-04 | Uacj Corporation | Aluminum alloy foil for electrode current collector, method for manufacturing same, and lithium ion secondary battery |
| CN102744255B (en) * | 2012-07-07 | 2015-02-04 | 华北铝业有限公司 | Process for producing battery aluminium foil |
| JP5567719B2 (en) * | 2012-07-26 | 2014-08-06 | 三菱アルミニウム株式会社 | Method for producing aluminum alloy foil for positive electrode current collector of lithium ion secondary battery, aluminum alloy foil for lithium ion secondary battery positive electrode current collector and lithium ion secondary battery |
| JP5927614B2 (en) * | 2012-08-29 | 2016-06-01 | 株式会社神戸製鋼所 | Aluminum hard foil for battery current collector |
| JP6039868B2 (en) * | 2012-12-27 | 2016-12-07 | 株式会社Ｕａｃｊ製箔 | Method for producing negative electrode current collector for secondary battery |
| CN105074979B (en) * | 2013-03-29 | 2018-04-06 | 株式会社Uacj | Collector, electrode assembly, nonaqueous electrolyte battery and electric power storage parts |
| JP6513896B2 (en) * | 2013-12-13 | 2019-05-15 | 三菱アルミニウム株式会社 | Aluminum alloy foil for lithium ion battery positive electrode current collector and method for producing the same |
| JP6631051B2 (en) * | 2015-06-30 | 2020-01-15 | 住友電気工業株式会社 | Lead conductor and power storage device |
| RU2748842C1 (en) * | 2020-06-01 | 2021-05-31 | Виктор Валентинович Стрелков | Aluminium condenser erbium-doped source foil |
| WO2024065386A1 (en) * | 2022-09-29 | 2024-04-04 | 宁德新能源科技有限公司 | Electrochemical device and electronic device |
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| JP4704557B2 (en) * | 2000-12-05 | 2011-06-15 | 古河スカイ株式会社 | Aluminum alloy fin material excellent in reflaring formability and its manufacturing method |
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| JP2007138234A (en) * | 2005-11-17 | 2007-06-07 | Mitsubishi Alum Co Ltd | Aluminum alloy foil for electrolytic capacitor cathode and method for producing the same |
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| JP5160849B2 (en) * | 2007-09-27 | 2013-03-13 | 東洋アルミニウム株式会社 | Aluminum alloy foil for current collector |
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| JP2010043333A (en) * | 2008-08-14 | 2010-02-25 | Furukawa-Sky Aluminum Corp | Aluminum foil for positive electrode collector |
| JP5639398B2 (en) * | 2010-07-16 | 2014-12-10 | 株式会社神戸製鋼所 | Aluminum hard foil for battery current collector |
| JP5405410B2 (en) * | 2010-08-05 | 2014-02-05 | 株式会社神戸製鋼所 | Aluminum alloy hard foil for battery current collector |
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