CN110644022A - Ultrathin copper foil for producing lithium ion battery by electrolytic calendering and preparation method thereof - Google Patents
Ultrathin copper foil for producing lithium ion battery by electrolytic calendering and preparation method thereof Download PDFInfo
- Publication number
- CN110644022A CN110644022A CN201910872011.1A CN201910872011A CN110644022A CN 110644022 A CN110644022 A CN 110644022A CN 201910872011 A CN201910872011 A CN 201910872011A CN 110644022 A CN110644022 A CN 110644022A
- Authority
- CN
- China
- Prior art keywords
- copper foil
- electrolytic
- lithium ion
- ion battery
- rolling
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
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- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
- C25D1/00—Electroforming
- C25D1/04—Wires; Strips; Foils
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
- B21B1/40—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling foils which present special problems, e.g. because of thinness
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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
-
- 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
-
- 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
Abstract
The invention discloses an ultra-thin copper foil for producing a lithium ion electronic cell by electrolytic rolling combination and a preparation method thereof, wherein the ultra-thin copper foil comprises the following steps of manufacturing a 9-micron ~ 70-micron double-sided photoelectrolytic copper foil by an electrolytic foil machine, rolling the double-sided photoelectrolytic copper foil into a 6-micron ~ 8-micron copper foil by a rolling mill, and cutting the copper foil into finished copper foil rolls after surface cleaning.
Description
Technical Field
The invention relates to the technical field of lithium ion battery production, in particular to an ultrathin copper foil for a lithium ion battery and a preparation method thereof.
Background
The ultra-thin copper foil for the lithium ion battery is one of particularly important parts in the manufacturing industry of the lithium ion battery, is used as a negative electrode current collector of the lithium ion battery, and the conventional ultra-thin copper foil for the lithium ion battery generally has two manufacturing methods. One is electrolytic method and one is calendering method. The electrolytic method is that copper ions are generated by dissolving copper liquid, then the copper ions are reduced into copper atoms under the action of a foil-generating direct-current electric field and stripped on a cathode roller, and the copper atoms are cut into finished rolls after passivation treatment; the rolling method is to heat a copper ingot, carry out planing descaling on the copper ingot, carry out continuous tempering toughening descaling after cold rolling by a double cold rolling mill, and roll and thin the copper ingot into a finished product after welding piece by piece. The lithium ion battery has the advantages of low production cost, low manufacturing difficulty and the like, but because the crystal grain structure of the cathode roller facing to the electrolytic method is different from the crystal grain structure of the cathode roller facing away from the electrolytic method, the internal stress of the two surfaces of the copper foil is different, and the toughness and the ductility of the copper foil are lower; the rolled copper foil has the advantages of high strength, high ductility, good toughness, good bending resistance and the like, and the performance is high-end copper foil.
For example, chinese patent publication No. CN106513438B discloses a method for manufacturing a high-precision rolled copper foil for lithium batteries, which comprises improving the rolling steps and parameters of a copper foil rolling mill to roll a 0.15mm copper foil base material into a 0.0097mm rolled copper foil through five passes, so as to meet the requirement of the rolled copper foil for lithium batteries on bending resistance, but has the problems of high processing difficulty, high equipment requirement and high cost, and further, as chinese utility model patent CN207918974U discloses a green foil machine anode plate structure for improving the uniformity adjustment of the copper foil thickness, which comprises a plurality of strip-shaped titanium anode plates arranged in a splicing manner, wherein a plurality of conductive bolts are uniformly arranged on the lower surface of each strip-shaped titanium anode plate along the length direction, at least one strip-shaped titanium anode plate among the plurality of strip-shaped titanium anode plates is a thickness adjustment plate, the uniformity adjustment plate is formed by splicing a plurality of short strip-shaped titanium anode plates along the length direction, the lower surface of each short titanium anode plate is provided with a conductive bolt, each short titanium anode plate is connected with an independent direct current power supply, and the input current of each short titanium anode plate is regulated by the independent direct current power supply. The structure can adjust the thickness uniformity of the copper foil in the width direction, but cannot adjust the difference of internal stress of two surfaces of the copper foil.
Disclosure of Invention
The invention aims to solve various defects of the existing preparation method of the ultrathin copper foil for the lithium ion battery, and provides the ultrathin copper foil for the lithium ion battery produced by the combination of electrolysis and calendering with low production cost and high performance and the preparation method thereof.
The innovation of the invention is to provide the method for preparing the ultrathin copper foil for the lithium ion battery, which combines the advantages of the electrolytic copper foil and the rolled copper foil organically. The invention skillfully utilizes the electrolytic copper foil to produce the copper foil with certain thickness, solves the problem of high difficulty and high cost of the rolled copper foil production, and utilizes a rolling mill to roll the copper foil, thereby solving the defect of inconsistent internal stress of the two sides of the electrolytic copper foil, retaining the advantages of the electrolytic copper foil and the rolled copper foil process, and overcoming the defects of the two.
The technical scheme includes that the method for preparing the ultrathin copper foil for the lithium ion battery through the electrolytic calendaring combined production comprises the following steps of manufacturing a 9-micron ~ 70-micron double-sided photoelectrolysis copper foil by an electrolytic foil generating machine, rolling the double-sided photoelectrolysis copper foil into a 6-micron ~ 8-micron copper foil through a rolling mill, cleaning the surface of the double-sided photoelectrolysis copper foil, and cutting the double-sided photoelectrolysis copper foil into finished copper foil rolls.
The copper dissolving parameters of the electrolytic foil generating machine in the scheme are as follows: cu2+：70~110g/L；H2SO4:80~130g/L;Cl-:5~40mg/L。
The rolling bandwidth of the rolling mill in the scheme is 800mm, and the maximum rolling speed reaches (650 ~ 850) m/min.
An ultrathin copper foil for a lithium ion battery produced by electrolytic calendering combination is prepared by the preparation method.
The invention has the advantages that the double-sided photoelectrolysis copper foil is prepared by utilizing the electrolysis foil-generating machine, the cost is low, the production efficiency is greatly increased, the production cost is reduced, the defect that the traditional thick copper plate and copper ingot are directly utilized to roll the copper foil is overcome, and the double-sided photoelectrolysis copper foil is rolled by utilizing the rolling mill, so that the high-end copper foil with the same double-sided crystal grain structure, high strength and high ductility can be obtained.
Detailed Description
The technical solution of the present invention is clearly and completely described below with reference to the following embodiments. It is to be understood that the described embodiments are merely exemplary of the invention, and not restrictive of the full scope of the invention. All other embodiments based on the embodiments in the present invention, without any inventive work, will be apparent to those skilled in the art from the following description.
Example 1 a method for manufacturing an ultra-thin copper foil for a lithium ion battery by electrolytic calendaring, comprising the steps of manufacturing a 9 μm double-sided photo-electrolytic copper foil by an electrolytic foil forming machine, wherein the copper dissolution parameter is Cu2 +: 85 ~ 95g/L, H2SO4:100 ~ 110g/L, Cl-:5 ~ 15mg/L, rolling the double-sided photo-electrolytic copper foil by a six-roll mill at a speed of 650mm/min, rolling the double-sided photo-electrolytic copper foil by the mill to form a 6 μm copper foil, cleaning the surface of the copper foil, and cutting the copper foil into finished rolls.
Embodiment 2 discloses a method for preparing an ultrathin copper foil for a lithium ion battery by electrolytic rolling combined use, which comprises the following steps of manufacturing a 70-micron double-sided photoelectric copper foil by an electrolytic foil-generating machine, wherein the copper dissolution parameter comprises Cu2 +: 70 ~ 110g/L, H2SO4:80 ~ 130g/L and Cl < - > 5 ~ 40mg/L, rolling the double-sided photoelectric copper foil by a twenty-roll mill at the speed of 850mm/min, rolling the double-sided photoelectric copper foil by the mill to form a 8-micron copper foil, cleaning the surface of the copper foil, and cutting the copper foil into finished rolls.
The ultra-thin 6um copper foil prepared by the preparation method has the following test data:
through analysis, all the performances of the experimental copper foil meet the requirements, and the experimental copper foil is free from folding during rolling.
The ultra-thin 6um copper foil prepared by the preparation method has the following test data:
| serial number | Measurement item | PPK | Whether or not to meet the requirements | Determination |
| 1 | Mass per unit area | 2.21 | Is that | OK |
| 2 | Roughness (smooth surface Ra) | 1.54 | Is that | OK |
| 3 | Roughness (frosted Rz) | 3.71 | Is that | OK |
| 4 | Tensile strength | 1.53 | Is that | OK |
| 5 | Elongation percentage | 2.14 | Is that | OK |
It can be seen from the above table that the indexes are uniform and stable, and can be put into mass production.
Claims (4)
1. A method for preparing ultrathin copper foil for lithium ion battery by electrolytic rolling combination comprises the following steps of manufacturing a 9-micron ~ 70-micron double-sided photoelectrolytic copper foil by an electrolytic foil generating machine, rolling the double-sided photoelectrolytic copper foil into a 6-micron ~ 8-micron copper foil by a rolling mill, cleaning the surface of the copper foil, and cutting the copper foil into finished copper foil rolls.
2. The method for preparing the ultrathin copper foil for the lithium ion battery by the combination of the electrolytic calendering as claimed in claim 1, wherein the parameters of the electrolytic foil-generating machine for dissolving copper are as follows: cu2+：70~110g/L；H2SO4:80~130g/L;Cl-:5~40mg/L。
3. The method for preparing the ultra-thin copper foil for the lithium ion battery by the combination of the electrolytic calendering according to claim 1, wherein the rolling band width of the rolling mill is 800mm, and the maximum rolling speed reaches (650 ~ 850) m/min.
4. An electrolytic calendering is used jointly to produce lithium ion battery and uses ultra-thin copper foil, its characteristic is: the method for manufacturing the ultrathin copper foil for the lithium ion battery by the combination of the electrolytic calendering according to any one of claims 1 to 3.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910872011.1A CN110644022A (en) | 2019-09-16 | 2019-09-16 | Ultrathin copper foil for producing lithium ion battery by electrolytic calendering and preparation method thereof |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910872011.1A CN110644022A (en) | 2019-09-16 | 2019-09-16 | Ultrathin copper foil for producing lithium ion battery by electrolytic calendering and preparation method thereof |
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| Publication Number | Publication Date |
|---|---|
| CN110644022A true CN110644022A (en) | 2020-01-03 |
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| CN201910872011.1A Pending CN110644022A (en) | 2019-09-16 | 2019-09-16 | Ultrathin copper foil for producing lithium ion battery by electrolytic calendering and preparation method thereof |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113600636A (en) * | 2021-08-04 | 2021-11-05 | 许绝电工股份有限公司 | Copper foil pipe processing technology for lithium battery production |
| DE102022122200A1 (en) | 2022-09-01 | 2024-03-07 | Bayerische Motoren Werke Aktiengesellschaft | Method for producing a copper foil for an electrochemical memory, copper foil and use of a copper foil |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0762503A (en) * | 1993-08-30 | 1995-03-07 | Nippon Foil Mfg Co Ltd | Production of high-ductility copper foil |
| CN104878415A (en) * | 2015-05-05 | 2015-09-02 | 东莞市蓝姆材料科技有限公司 | Preparation method of ultra-thin high-tenacity copper foil |
| CN108930050A (en) * | 2017-05-26 | 2018-12-04 | 湖南省正源储能材料与器件研究所 | A kind of preparation method of negative electrode of lithium ion battery collector super-thin electronic copper foil |
-
2019
- 2019-09-16 CN CN201910872011.1A patent/CN110644022A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0762503A (en) * | 1993-08-30 | 1995-03-07 | Nippon Foil Mfg Co Ltd | Production of high-ductility copper foil |
| CN104878415A (en) * | 2015-05-05 | 2015-09-02 | 东莞市蓝姆材料科技有限公司 | Preparation method of ultra-thin high-tenacity copper foil |
| CN108930050A (en) * | 2017-05-26 | 2018-12-04 | 湖南省正源储能材料与器件研究所 | A kind of preparation method of negative electrode of lithium ion battery collector super-thin electronic copper foil |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113600636A (en) * | 2021-08-04 | 2021-11-05 | 许绝电工股份有限公司 | Copper foil pipe processing technology for lithium battery production |
| DE102022122200A1 (en) | 2022-09-01 | 2024-03-07 | Bayerische Motoren Werke Aktiengesellschaft | Method for producing a copper foil for an electrochemical memory, copper foil and use of a copper foil |
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Application publication date: 20200103 |