Classifications

• • C—CHEMISTRY; METALLURGY
  • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
  • C23F—NON-MECHANICAL REMOVAL OF METALLIC MATERIAL FROM SURFACE; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL; MULTI-STEP PROCESSES FOR SURFACE TREATMENT OF METALLIC MATERIAL INVOLVING AT LEAST ONE PROCESS PROVIDED FOR IN CLASS C23 AND AT LEAST ONE PROCESS COVERED BY SUBCLASS C21D OR C22F OR CLASS C25
  • C23F11/00—Inhibiting corrosion of metallic material by applying inhibitors to the surface in danger of corrosion or adding them to the corrosive agent
  • C23F11/08—Inhibiting corrosion of metallic material by applying inhibitors to the surface in danger of corrosion or adding them to the corrosive agent in other liquids
  • C23F11/10—Inhibiting corrosion of metallic material by applying inhibitors to the surface in danger of corrosion or adding them to the corrosive agent in other liquids using organic inhibitors
• • C—CHEMISTRY; METALLURGY
  • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
  • C23F—NON-MECHANICAL REMOVAL OF METALLIC MATERIAL FROM SURFACE; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL; MULTI-STEP PROCESSES FOR SURFACE TREATMENT OF METALLIC MATERIAL INVOLVING AT LEAST ONE PROCESS PROVIDED FOR IN CLASS C23 AND AT LEAST ONE PROCESS COVERED BY SUBCLASS C21D OR C22F OR CLASS C25
  • C23F11/00—Inhibiting corrosion of metallic material by applying inhibitors to the surface in danger of corrosion or adding them to the corrosive agent
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
  • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
  • B23K20/00—Non-electric welding by applying impact or other pressure, with or without the application of heat, e.g. cladding or plating
  • B23K20/10—Non-electric welding by applying impact or other pressure, with or without the application of heat, e.g. cladding or plating making use of vibrations, e.g. ultrasonic welding
• • C—CHEMISTRY; METALLURGY
  • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
  • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
  • C23C22/00—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
  • C23C22/05—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using aqueous solutions
  • C23C22/06—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using aqueous solutions using aqueous acidic solutions with pH less than 6
  • C23C22/24—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using aqueous solutions using aqueous acidic solutions with pH less than 6 containing hexavalent chromium compounds
• • C—CHEMISTRY; METALLURGY
  • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
  • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
  • C23C22/00—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
  • C23C22/78—Pretreatment of the material to be coated
• • C—CHEMISTRY; METALLURGY
  • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
  • C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
  • C25D7/00—Electroplating characterised by the article coated
  • C25D7/06—Wires; Strips; Foils
• • 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
• • 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
  • H01M4/665—Composites
  • H01M4/667—Composites in the form of layers, e.g. coatings
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
  • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
  • B23K2101/00—Articles made by soldering, welding or cutting
  • B23K2101/36—Electric or electronic devices
  • B23K2101/38—Conductors
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
  • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
  • B23K2103/00—Materials to be soldered, welded or cut
  • B23K2103/08—Non-ferrous metals or alloys
  • B23K2103/12—Copper or alloys thereof
• • 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
• • 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
• • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
  • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
  • Y10T428/00—Stock material or miscellaneous articles
  • Y10T428/24—Structurally defined web or sheet [e.g., overall dimension, etc.]
  • Y10T428/24355—Continuous and nonuniform or irregular surface on layer or component [e.g., roofing, etc.]
• • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
  • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
  • Y10T428/00—Stock material or miscellaneous articles
  • Y10T428/31504—Composite [nonstructural laminate]
  • Y10T428/31678—Of metal

Definitions

• the present invention relates to a copper foil.
• the present invention relates to a copper foil excellent in ultrasonic weldability in which copper foils are welded to each other or from a copper foil and another metal material by an ultrasonic welding method, and a method for producing the same.
• ultrasonic welding In ultrasonic welding, when ultrasonic vibration is applied with a constant pressure applied to the joint surface, the joint surface is rubbed, the oxide film and impurities are mechanically cleaned, and atomic diffusion is induced to interact with each other. To be joined. Since this ultrasonic welding method has a lower joining temperature than resistance welding, it is difficult to damage the welding object. In particular, the joining of dissimilar metals has an advantage that a brittle product is not seen in the joining portion and the cost is low.
• Copper foil has better weldability when its surface is not rust-proofed. However, if the rust prevention treatment is not performed, the copper foil surface is easily oxidized in the atmosphere and is not suitable for practical use.
• a method of forming a rust preventive film is known.
• a formal method of the rust preventive film a chromate treatment is performed in an acidic bath (pH 1-2) to form a chromium hydrated oxide film called a chromate film, and in a solution containing a triazole compound and a tetrazole compound.
• a method for forming an organic rust preventive film by dipping is known.
• the copper foil which gave the rust preventive film is hard to discolor in air
• the thickness of a rust preventive film is thick, the situation where the joint strength by ultrasonic welding is not enough may generate
• the anticorrosive coating covers the copper foil surface, so even if ultrasonic vibration is applied, the surface is difficult to clean and pure copper does not come out on the surface. This is thought to be due to weakening.
• the adhesion between the current collector and the active material becomes a problem as one of the conditions that influence the performance of the nonaqueous solvent secondary battery.
• the adhesion strength between the current collector (copper foil) and the active material is reduced when a chromium hydrated oxide film is present as a rust preventive film on the surface of the copper foil.
• the experimental results are obtained.
• an oxide film with a thickness greater than the thickness on the copper foil surface is produced by this heating, the battery characteristics are adversely affected, and as described above, the surface is difficult to be cleaned and the ultrasonic weldability is adversely affected. Has been obtained.
• Patent Document 2 a copper foil on which a rust-preventive film having an inverse (1 / C) value of electric double layer capacity indicating a surface thickness of 0.1 to 0.3 cm 2 / ⁇ F or less is formed.
• a copper foil on which a rust-preventive film having an inverse (1 / C) value of electric double layer capacity indicating a surface thickness of 0.1 to 0.3 cm 2 / ⁇ F or less is formed.
• the rust prevention treatment by simply applying the triazole rust inhibitor alone has insufficient affinity between the triazole rust inhibitor and the solvent.
• a part of the triazole rust inhibitor component may be powdered and appear on the surface of the copper foil.
• the current collector (copper foil) Inhibits adhesion between the active material and the active material.
• the copper foil surface remains uncleaned by this powder during ultrasonic welding, it adversely affects ultrasonic weldability.
• JP 2009-068042 A Japanese Patent No. 3581784
• the inventors of the present invention provide a rust preventive film provided on the surface of a copper foil when ultrasonically welding a plurality of copper foils or when welding a copper foil and another metal such as a tab terminal with ultrasonic waves. As a result, the present inventors have found that the type and thickness thereof greatly influence the ultrasonic weldability (bonding strength), and have completed the present invention.
• the present inventors have found that the surface roughness (Rz) of the copper foil also affects the joining force of the copper foil by ultrasonic welding. That is, when ultrasonic vibration is applied to a copper foil having a rough surface to bond the copper foils to each other, the copper foil having a rough surface has a low bonding strength. This is presumed that since the roughness (Rz) is rough, the contact at the time of bonding becomes local, and bonding occurs at the convex and concave portions, but bonding does not occur at the concave portions and the bonding strength decreases.
• the present inventors have found that the presence or absence of a powdery substance appearing on the surface of the copper foil affects the joining force of the copper foil by ultrasonic welding. That is, when there is a rust preventive powder on the surface of the copper foil, the contact area between the copper foil and the copper foil or between the copper foil and the dissimilar metal during ultrasonic welding is small because the rust preventive powder is an obstacle. Therefore, it was estimated that the portion where the powder was present was not sufficiently cleaned and the bonding strength was reduced.
• the present invention provides an organic rust-preventing film having a reciprocal (1 / C) value of electric double layer capacity indicating a thickness of more than 0.3 cm 2 / ⁇ F and not more than 0.8 cm 2 / ⁇ F on at least one surface of a copper foil.
• a surface-treated copper foil on which is formed, and a method for producing the same Is a surface-treated copper foil on which is formed, and a method for producing the same.
• the organic rust preventive film is preferably formed of a triazole compound, a dicarboxylic acid, an amine, or a tetrazole compound, a dicarboxylic acid, or an amine.
• the organic anti-corrosion having a reciprocal (1 / C) value of the electric double layer capacity indicating the surface thickness on at least one surface of the copper foil is 0.3 to 0.8 cm 2 / ⁇ F.
• a rust film is formed by contacting and drying a solution containing a triazole compound, dicarboxylic acids, and amines on the surface of a copper foil.
• the organic anti-corrosion having a reciprocal (1 / C) value of the electric double layer capacity indicating the surface thickness on at least one surface of the copper foil is 0.3 to 0.8 cm 2 / ⁇ F.
• the rust film is formed by contacting and drying a solution containing a tetrazole compound, dicarboxylic acids, and amines on the surface of the copper foil.
• the roughness Rz (10-point average roughness defined by JISB0601-1994) of at least the surface of the copper foil on which the organic rust preventive film is formed is 2.0 ⁇ m or less.
• the present invention it is possible to provide a surface-treated copper foil excellent in weldability between copper foils by ultrasonic welding or between a copper foil and another metal. Moreover, the surface treatment method of the copper foil excellent in ultrasonic weldability of the present invention can easily produce a surface-treated copper foil excellent in weldability between copper foils by ultrasonic welding or between copper foil and other metals. can do. Furthermore, this invention can provide the surface-treated copper foil which is excellent in ultrasonic weldability, and is excellent in adhesiveness with an active material as a battery collector.
• the surface-treated copper foil of the embodiment of the present invention is a copper foil (in the embodiment of the present invention, when there is no need to express the electrolytic copper foil and the rolled copper foil individually, these are collectively referred to as the copper foil).
• the reciprocal (1 / C) value of the electric double layer capacity in the surface-treated copper foil according to the embodiment of the present invention is set within a range of 0.3 to 0.8 cm 2 / ⁇ F.
• the 1 / C value is less than 0.1 cm 2 / ⁇ F, the thickness of the rust preventive film is insufficient, and contact between moisture in the atmosphere and the copper surface cannot be sufficiently prevented at room temperature. ⁇ Surface oxidation and discoloration are likely to occur during transportation.
• the thickness of the organic rust preventive film affects the weldability is that, as described above, the organic rust preventive film covers the copper foil surface. However, since the surface is difficult to clean and pure copper does not come out on the surface, it is considered that atomic diffusion hardly occurs and the bonding force is weak.
• the surface strength of the copper foil also affects the joining force of ultrasonic welding.
• ultrasonic vibration is applied to a copper foil having a 10-point average roughness (Rz) specified by JIS B0601-1994 exceeding 2.0 ⁇ m
• the bonding strength is reduced.
• the copper foils having an Rz of more than 2.0 ⁇ m are ultrasonically bonded and the cross section of the copper foil is observed, voids are often generated. This is because the contact at the time of bonding becomes local due to the roughness being rough, and bonding occurs at the convex and concave portions of the concave and convex portions, but bonding does not occur at the concave portions, and the portion becomes a void and the bonding strength decreases. Conceivable.
• At least one surface of the copper foil is immersed in a solution of triazole compound, dicarboxylic acid, amine, or tetrazole compound, dicarboxylic acid, amine, and the surface of the copper foil is immersed. It is preferable to form an organic rust preventive film.
• examples of the triazole compound include benzotriazole, tolyltriazole, carboxybenzotriazole, chlorobenzotriazole, ethylbenzotriazole, and naphthotriazole.
• Examples of the tetrazole compound in the embodiment of the present invention include 1H-tetrazole / monoethanolamine salt.
• examples of dicarboxylic acids include oxalic acid, malonic acid, succinic acid, glutaric acid, adipic acid, pimelic acid, phthalic acid, and the like.
• examples of amines include monoamines such as monoalkylamine, dialkylamine, trialkylamine, monocyclohexylamine, dicyclohexylamine, diamines substituted with 1 to 4 alkyl groups, and alkyl groups.
• monoamines such as monoalkylamine, dialkylamine, trialkylamine, monocyclohexylamine, dicyclohexylamine, diamines substituted with 1 to 4 alkyl groups, and alkyl groups.
• alkyl monoamines, alkyl diamines and the like in which at least one of them has a hydrophilic group such as a hydroxyl group or a polyoxyethylene group.
• Specific examples include monoethanolamine, diethanolamine, triethanolamine, dimethylethanolamine, diethylethanolamine, monomethylethanolamine, monoethylethanolamine, monobutylethanolamine and the like.
• the dicarboxylic acid is 0.4 to 2 times and the amine is 0.5 to 2 times the weight of the triazole compound. This is because even when dicarboxylic acids are added twice or more, the improvement of the rust prevention function can no longer be expected, and when it is less than 0.4 times, the rust prevention function effect is not exhibited. Moreover, it is because improvement of a rust prevention function can no longer be expected even if amines are added twice or more, and if it is less than 0.5 times, the effect of improving the affinity between the triazole compound and water as a solvent is not exhibited. .
• the concentration of the solution with a triazole compound, a dicarboxylic acid, and an amine that forms a rust preventive film on the copper foil surface is preferably 50 to 6,000 ppm. If it is less than 50 ppm, the organic rust preventive film is not thick enough to maintain the rust preventive function. If it exceeds 6,000 ppm, the thickness of the organic rust preventive film will be increased and the bonding conditions in ultrasonic welding will be inhibited. This is because the effect of improving the rust prevention function cannot be expected so much.
• the pH of the triazole compound, dicarboxylic acid, and amine solution is preferably 6-9. Further, the temperature of the solution at the time of film formation on the copper foil surface may be 30 to 70 ° C., but it may be further heated if necessary. When the solution temperature is lower than 30 ° C., the formed rust preventive film becomes fragile, the contact between moisture in the atmosphere and copper cannot be prevented, and improvement of the rust preventive function cannot be expected.
• the blending ratio of the tetrazole compound, dicarboxylic acid and amine is about 0.4 to 2 times the weight of the tetrazole compound and about 0.5 to 2 times the amine is effective. This is because even when dicarboxylic acids are added twice or more, the improvement of the rust prevention function can no longer be expected, and when it is less than 0.4 times, the rust prevention function effect is not exhibited. Moreover, it is because the improvement of a rust prevention function can no longer be expected even if amines are added 2 times or more, and if it is less than 0.5 times, the effect of improving the affinity between the tetrazole compound and the solvent is not exhibited.
• the total concentration of the tetrazole compound, dicarboxylic acid, and amine solution that forms a rust preventive film on the copper foil surface is preferably 50 to 6,000 ppm. If it is less than 50 ppm, it will not be an organic rust preventive film with a thickness sufficient to maintain the protective function, and if it exceeds 6,000 ppm, the thickness of the organic rust preventive film will increase and inhibit the joining conditions in ultrasonic welding. This is because the effect of improving the protective function cannot be expected so much.
• the pH of the tetrazole compound, dicarboxylic acid, and amine solution is preferably 6-9. Further, the temperature of the solution at the time of film formation on the copper foil surface may be 30 to 70 ° C., but it may be further heated if necessary. When the solution temperature is lower than 30 ° C., the formed rust preventive film becomes fragile, the contact between moisture in the atmosphere and copper cannot be prevented, and improvement of the rust preventive function cannot be expected.
• the immersion time of the copper foil in the solution is appropriately determined depending on the concentration of the triazole compound, tetrazole compound, dicarboxylic acid and amines, the solution temperature, and the thickness of the organic rust preventive film to be formed. It may be about 5 to 30 seconds.
• the method of forming an organic rust preventive film is to pickle in the case of electrolytic copper foil, wash with water or wash / dry, and then rust preventive solution with dicarboxylic acid and amines added to the triazole compound, or It is immersed in a rust inhibitor solution in which dicarboxylic acid and amines are added to a tetrazole compound, and an organic rust preventive film is applied.
• a very thin copper oxide film of about 20 mm is formed on the copper foil surface by exposure to the atmosphere.
• typical characteristics of the present invention such as ultrasonic weldability and discoloration resistance.
• water or a hydrocarbon solvent is used as the solvent, but the effect of the present invention does not change regardless of which is used.
• the rolling oil remaining on the surface is degreased, the degreased copper foil is washed with water or washed with water and dried, and the degreased copper foil is protected with tricarboxylic acid compounds added with dicarboxylic acid and amines. It is immersed in a rusting agent solution or a rusting agent solution obtained by adding a dicarboxylic acid or an amine to a tetrazole compound, and an organic rusting coating is applied. In addition, after performing degreasing, pickling, washing with water or drying with water, and then immersing in an anticorrosive solution, a very thin copper oxide film of about 20 mm is formed on the surface of the copper foil.
• current density 1 to 10 A / dm 2 , 0.1 min to 5 min It is effective to perform electrolytic degreasing.
• Triazole compound benzotriazole tetrazole compound: 1H-tetrazole monoethanolamine salt dicarboxylic acid: malonic acid amine: triethanolamine
• Table 6 shows the conditions of ultrasonic welding. Under the conditions shown in Table 6, ultrasonic welding was performed on the dove terminals made of the materials shown in Table 7 for the copper foils of the example and the comparative example. The results are shown in Table 8. In addition, the evaluation result is ⁇ when all the stacked copper foils and the mating tab terminal are completely welded, ⁇ when the mating tab terminal was welded but the mutual welding of the stacked copper foils was insufficient, The case where the welding between the copper foil and the mating tab terminal was insufficient was rated as x.
• Comparative Examples 1 to 4 in which the rust preventive film was formed with a solution consisting only of the triazole compound were severely oxidized after heating at high temperature, and the weldability was inferior due to the appearance of the powder. Furthermore, since the rust preventive film is fragile and the function of suppressing contact between the copper foil and moisture in the atmosphere is not sufficient, discoloration after exposure to a high temperature and high humidity environment was severe.
• Comparative Examples 5 to 8 in which a rust preventive film was formed with a solution composed of two components of a triazole compound and a dicarboxylic acid, since the dicarboxylic acid reinforces the rust preventive film, the discoloration after exposure to a high-temperature and high-humidity environment is Comparative Examples 1 to 4. Slightly suppressed compared to. However, the appearance of the oxide film and powder after high temperature heating is not suppressed, and the weldability is somewhat inferior.
• Comparative Example 13 in which a rust preventive film was formed at 20 ° C. with a solution consisting of three components of triazole compound, dicarboxylic acid and amine, and a rust preventive film at 20 ° C. with a solution consisting of three components of tetrazole compound, dicarboxylic acid and amine.
• the formed Comparative Example 14 since the strength of the formed anticorrosive film is not sufficient, the function of suppressing the contact between the copper foil and moisture in the atmosphere is not sufficient, and the discoloration after exposure to a high temperature and high humidity environment was severe. . Moreover, the oxide film and powdery appearance after high temperature heating cannot be suppressed, resulting in poor weldability.
• a surface-treated copper foil excellent in weldability between copper foils by ultrasonic welding or between a copper foil and another metal it is possible to provide a surface-treated copper foil excellent in weldability between copper foils by ultrasonic welding or between a copper foil and another metal.
• a surface-treated copper foil excellent in weldability between copper foils by ultrasonic welding or between copper foil and other metals can be easily obtained. Can be manufactured.

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• Electrochemistry (AREA)
• Composite Materials (AREA)
• Preventing Corrosion Or Incrustation Of Metals (AREA)
• Chemical Treatment Of Metals (AREA)

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• 2010
  • 2010-12-24 EP EP10839586A patent/EP2518184A1/en not_active Withdrawn
  • 2010-12-24 KR KR20127017650A patent/KR20120109544A/ko not_active Ceased
  • 2010-12-24 CN CN2010800592733A patent/CN102713006A/zh active Pending
  • 2010-12-24 JP JP2010288000A patent/JP5675325B2/ja active Active
  • 2010-12-24 WO PCT/JP2010/073419 patent/WO2011078357A1/ja not_active Ceased
  • 2010-12-24 US US13/518,648 patent/US20120258281A1/en not_active Abandoned
  • 2010-12-27 TW TW99146219A patent/TW201132800A/zh unknown

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