CN102931414B - Preparation process for copper foil for lithium ion battery current collector - Google Patents
Preparation process for copper foil for lithium ion battery current collector Download PDFInfo
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- CN102931414B CN102931414B CN201210430178.0A CN201210430178A CN102931414B CN 102931414 B CN102931414 B CN 102931414B CN 201210430178 A CN201210430178 A CN 201210430178A CN 102931414 B CN102931414 B CN 102931414B
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- copper foil
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- deposition roller
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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 relates to an electrochemical coating film and particularly relates to a preparation process for a copper foil for a lithium ion battery current collector. The preparation method comprises the steps of: firstly, carrying out local insulating treatment on the surface of an electro-deposition roller of an electrolytic copper foil to form a lattice point shaped pattern; then, carrying out an electro-deposition process for the electrolytic copper foil, wherein the copper foil obtained by deposition is a mesh-shaped foil sheet with the lattice point pattern consistent with that of the electrical insulating region. According to the preparation process for the copper foil for the lithium ion battery current collector, the mesh-hole-shaped copper foil for the cathode current collector of the lithium ion battery is prepared, the weight ratio of the copper foil in the cathode piece in the lithium ion battery can be reduced, the unit weight capacity of the cell is improved, and the preparation process can be compatible with the copper foil production device used in the existing lithium ion battery production; and the preparation process can be achieved only by improving the existing copper foil production device part, namely the electro-deposition roller.
Description
Technical field
The present invention relates to electrochemical filming, especially a kind of preparation technology of copper foil for lithium ion battery current collector.
Background technology
Lithium (ion) battery is now widely used a kind of secondary technology, has capacity large, the advantages such as volume is little, lightweight.In existing lithium ion battery, usually use Copper Foil as the electrojet body of negative pole, at copper foil surface coating negative material, form negative plate; Aluminium foil is positive pole electrojet body, at aluminium foil surface coating positive electrode active materials, forms positive plate; Positive plate and negative plate are superimposed together after being isolated by barrier film, namely define a lithium ion battery.The capacitance of the every monomer weight of battery is an important indicator of lithium ion performance, improves the capacitance of battery Unit Weight, is the important and lasting problem of technical field of lithium ion one.
In current lithium ion battery industry, the most frequently used negative material is generally the material with carbon element of graphite, semi-graphited, and negative current collector is generally Copper Foil.As the graphite of negative material, the material with carbon element of semi-graphited, relative to positive electrode, Unit Weight easily comparatively large and density is relatively little, on pole piece, the applied thickness of negative material is generally about 1/3 of positive electrode applied thickness; Relative to copper foil current collector, the density of carbon negative pole material is about 1/6 of Copper Foil, in negative plate, the ratio occupied by the weight of Copper Foil is 30 ~ 40%, in whole battery, the weight accounting of Copper Foil is about 10%, if in negative plate, the consumption of Copper Foil can be reduced, just can reduce the weight of battery to a certain extent, promote the capacitance of battery Unit Weight, use netted Copper Foil to be an effective approach.
During current lithium battery is produced, part employs copper mesh cloth as negative current collector, similar with the weight accounting effect of copper current collector in aforesaid minimizing negative plate, a problem of copper mesh cloth is, during production need by metallic copper wire drawing, and then copper wire is woven into screen cloth, cost is higher, and screen cloth copper wire string diameter used is comparatively thick, to a certain degree reduce the effect that it promotes battery Unit Weight capacitance.
Summary of the invention
The object of this invention is to provide a kind of preparation technology of copper foil for lithium ion battery current collector, the Copper Foil with mesh can be prepared, the Unit Weight gram volume of battery after using, can be improved.
A kind of preparation technology of copper foil for lithium ion battery current collector, its special feature is, comprise the steps: first to carry out minor insulation process on the surface at the electro-deposition roller of electrolytic copper foil, form the figure of net-point shape, and then carrying out the electrodeposition technology of electrolytic copper foil, the Copper Foil obtained after deposition is the mesh paillon foil consistent with the site figure of electric insulated region.
Wherein carry out minor insulation process on the surface at the electro-deposition roller of electrolytic copper foil, adopt laser cladding process, plasma sputtering coating process or chemical etching technology to realize.
Wherein laser cladding process is specifically on laser cladding of coating treatment facility, first utilize the mode of Electrostatic Absorption at the compound powder of electro-deposition roller Adsorption on Surface one deck electric insulation, then the region forming electric insulation surface is being needed, by laser beam focus on the electric insulation powder bed of electro-deposition roller Adsorption on Surface, utilize the high temperature of laser beam irradiation, the compound powder of electric insulation is melted, is formed in the rete of electro-deposition roller surface firm attachment.
Further, wherein the compound of electric insulation adopts aluminium oxide, silicon dioxide, silicon nitride or zirconium dioxide.
Wherein the concrete steps of plasma sputtering coating process are as follows:
(1) electro-deposition roller surface cleaning: service quality mark be 1% ~ 5% NaOH solution electro-deposition roller surface is cleaned, and then repeatedly rinse 10 ~ 20 minutes with deionized water;
(2) photoresists coating: under gold-tinted or dark surrounds, at the surface uniform coating photoresists of electro-deposition roller, then dries 10 ~ 20 minutes, obtains the photoresists rete that thickness is 10 ~ 50 microns under 80 ~ 90 degree celsius temperature;
(3) patterning: use laser graphics scanning device, at electro-deposition roller surface scan electric insulation district site figure, immerses electro-deposition roller after completing in the NaOH solution of mass fraction 0.1 ~ 1% and obtains electric insulated region figure after 1 ~ 5 minute;
(4) the electro-deposition roller completing electric insulated region patterning is put into plasma sputtering filming equipment, plate required rete, thicknesses of layers 5 to 100 microns;
(5), after electro-deposition roller being taken out from sputtering coating equipment, immerse in the NaOH solution of mass fraction 1% ~ 10% and soak 10 to 20 minutes, repeatedly rinse 10 to 20 minutes with deionized water afterwards.
The present invention proposes a kind of preparation technology of copper foil for lithium ion battery current collector, the Copper Foil with mesh can be prepared, for lithium ion battery negative collector, the Copper Foil weight accounting in lithium ion battery in negative plate can be reduced, improve the Unit Weight gram volume of battery, and can compatible existing lithium ion battery produce in the Copper Foil production equipment that uses, only need to existing Copper Foil production equipment parts, namely electro-deposition roller carries out improvement and just can realize.
Embodiment
The present invention is a kind of preparation technology of copper foil for lithium ion battery current collector, before the technique of carrying out electrolytic copper foil electro-deposition, the insulation processing of local is carried out on the surface at the electro-deposition roller of electrolytic copper foil, form the figure (as: array of circle, ellipse, rectangle equal-specification shape) of net-point shape, through the region of surface insulation process, in electrodeposition process, no current passes through, do not have elemental copper to separate out, the Copper Foil obtained after deposition is the mesh paillon foil consistent with the site figure of electric insulated region.
In the electric insulated region that electro-deposition roller is formed on the surface, 1) region of electric insulation and electrically non-insulative region form continuous print smooth surface, do not have step between the two; 2) electric insulated region and electrically non-insulative region are discrete smooth surface, the step exceeding electrically non-insulative region is formed through the region of electric insulation process, its height can decide according to the difference of prepared copper thickness, and shoulder height scope can from 0 ~ 100 micron; 3) electric insulated region figure is net-point shape graphic array, and site figure can be regular circle shapes, ellipse, square, prismatic, do not plan figure etc., and dot density size and shape all can be determined as required.
In the electric insulated region that electro-deposition roller is formed on the surface, its formation method has following several:
(1) laser cladding of coating method: laser cladding of coating method technical process is: first utilize the mode of Electrostatic Absorption at the compound powder of the Adsorption on Surface last layer electric insulation of electro-deposition roller, as: aluminium oxide, silicon dioxide, silicon nitride, zirconium dioxide etc.; Then needing the region forming electric insulation surface, by laser beam focus on the electric insulation powder bed of electro-deposition roller Adsorption on Surface, utilizing the high temperature of laser beam, the compound powder of electric insulation is melted, form the rete with electro-deposition roller surface firm attachment;
(2) plasma sputtering coating method: plasma sputtering coating method is widely used film plating process, use the method for plasma sputtering, needing to form the compound rete that the electro-deposition roller surface sputtering of electric insulated region insulate, thicknesses of layers can from 0 to several microns; As electric insulated region thicknesses of layers need be increased, after completing insulating regions electric insulation rete plated film, the mode of chemical corrosion can be used, a part fallen in the surface corrosion in electrically non-insulative region.
The present invention can on existing electrolytic copper foil production technology basis, insulating process is carried out to electro-deposition roller surface wherein, the electric insulation figure of net-point shape is formed on the surface of electro-deposition roller, other technological parameter and condition only need carry out small adjustment, can for the preparation of the Copper Foil of affluxion body in lithium ion batteries.The Copper Foil that the present invention proposes is the net foil of hollow out, and the mesh pattern shape of web, pattern magnitude, reticular density, arrangement mode all can be arranged flexibly.This Copper Foil is used for the preparation of existing lithium ion battery, effectively can improve the Unit Weight capacitance of battery.
Embodiment 1:
Electric insulation site figure is formed on electro-deposition surface by laser cladding of coating method:
Laser cladding of coating method technical process is: on laser cladding of coating treatment facility, first utilizes the mode of Electrostatic Absorption at the alumina powder of the Adsorption on Surface last layer electric insulation of electro-deposition roller; Then the region forming electric insulation surface is being needed, namely the round dot in circular dot matrix, by laser beam focus on the electric insulation powder bed of electro-deposition roller Adsorption on Surface, utilizes the high temperature of laser beam, the compound powder of electric insulation is melted, forms the rete with electro-deposition roller surface firm attachment;
Use the electro-deposition roller through insulation patterns process, by normal electrolytic copper foil production technology, prepare required netted Copper Foil.
Embodiment 2:
Plasma sputtering coating method:
Electro-deposition roller surface cleaning: service quality mark be 2% NaOH solution electro-deposition roller surface is cleaned, after the pollutant such as greasy dirt on removing surface, repeatedly rinse 15 minutes with deionized water;
Photoresists are coated with: under gold-tinted or dark surrounds, and at the surface uniform coating photoresists of electro-deposition roller, film thickness 30 microns, then dries 10 minutes under 85 degree celsius temperature;
Patterning: use laser graphics scanning device, form electric insulation district site figure at electro-deposition roller surface scan, in this example, adopt the array that multiple identical rectangular forms, after completing, electro-deposition roller is immersed in the NaOH solution of mass fraction 0.5%, after 3 minutes, obtain electric insulated region figure.Electro-deposition roller is taken out from NaOH solution, with deionized water rinsing 5 minutes, the NaOH solution on electro-deposition roller surface is rinsed well.With 110 DEG C of dim winds 10 minutes, the photosensitive layer to electro-deposition roller surface was completely dry.
The electro-deposition roller completing electric insulated region patterning is put into plasma sputtering filming equipment, plates required rete, thicknesses of layers 20 microns.
After electro-deposition roller is taken out from sputtering coating equipment, immerse in the NaOH solution of mass fraction 5% and soak 10 minutes, repeatedly rinse 10 minutes with deionized water afterwards.
Use the electro-deposition roller through insulation patterns process, by normal electrolytic copper foil production technology, prepare required netted Copper Foil.
Claims (1)
1. the preparation technology of a copper foil for lithium ion battery current collector, it is characterized in that, comprise the steps: first to carry out minor insulation process on the surface at the electro-deposition roller of electrolytic copper foil, form the figure of net-point shape, and then carrying out the electrodeposition technology of electrolytic copper foil, the Copper Foil obtained after deposition is the mesh paillon foil consistent with the site figure of electric insulated region;
Wherein carry out minor insulation process on the surface at the electro-deposition roller of electrolytic copper foil, adopt plasma sputtering coating process to realize;
Wherein the concrete steps of plasma sputtering coating process are as follows:
(1) electro-deposition roller surface cleaning: service quality mark be 1% ~ 5% NaOH solution electro-deposition roller surface is cleaned, and then repeatedly rinse 10 ~ 20 minutes with deionized water;
(2) photoresists coating: under gold-tinted or dark surrounds, at the surface uniform coating photoresists of electro-deposition roller, then dries 10 ~ 20 minutes, obtains the photoresists rete that thickness is 10 ~ 50 microns under 80 ~ 90 degree celsius temperature;
(3) patterning: use laser graphics scanning device, at electro-deposition roller surface scan electric insulation district site figure, immerses electro-deposition roller after completing in the NaOH solution of mass fraction 0.1 ~ 1% and obtains electric insulated region figure after 1 ~ 5 minute;
(4) the electro-deposition roller completing electric insulated region patterning is put into plasma sputtering filming equipment, plate required rete, thicknesses of layers 5 to 100 microns;
(5), after electro-deposition roller being taken out from sputtering coating equipment, immerse in the NaOH solution of mass fraction 1% ~ 10% and soak 10 to 20 minutes, repeatedly rinse 10 to 20 minutes with deionized water afterwards.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201210430178.0A CN102931414B (en) | 2012-11-01 | 2012-11-01 | Preparation process for copper foil for lithium ion battery current collector |
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| CN201210430178.0A CN102931414B (en) | 2012-11-01 | 2012-11-01 | Preparation process for copper foil for lithium ion battery current collector |
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| CN102931414A CN102931414A (en) | 2013-02-13 |
| CN102931414B true CN102931414B (en) | 2015-03-11 |
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Families Citing this family (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104993153A (en) * | 2015-07-13 | 2015-10-21 | 深圳市信宇人科技有限公司 | Production method of microporous copper foil, microporous copper foil and production device thereof |
| CN108110329A (en) * | 2018-01-09 | 2018-06-01 | 深圳市信宇人科技股份有限公司 | For making the production method of the cathode roll of metal micro-holes and its cathode roll |
| CN109065833B (en) * | 2018-06-28 | 2021-04-02 | 合肥国轩高科动力能源有限公司 | A method for surface treatment of porous current collector of silicon-carbon composite negative electrode sheet for lithium battery |
| CN109103503B (en) * | 2018-07-18 | 2020-11-03 | 惠州亿纬锂能股份有限公司 | Preparation method of lithium ion battery |
| CN109148892A (en) * | 2018-08-07 | 2019-01-04 | 北京科技大学 | A kind of preparation method of the three-dimensional porous copper foil of anode of lithium ion battery collector |
| CN108950608B (en) * | 2018-08-16 | 2019-08-02 | 安徽铜冠铜箔有限公司 | A kind of new netted copper foil preparation method |
| CN109494374A (en) * | 2018-11-12 | 2019-03-19 | 桑顿新能源科技有限公司 | Lithium ion battery silicon-carbon cathode piece and preparation method thereof |
| CN109728254B (en) * | 2018-12-03 | 2020-08-11 | 浙江大学 | Preparation technology of porous copper foil for negative electrode of lithium ion battery |
| TWI703238B (en) * | 2019-03-19 | 2020-09-01 | 利佳精密科技股份有限公司 | Microporous copper foil manufacturing method and microporous copper foil |
| CN112779568A (en) * | 2019-11-11 | 2021-05-11 | 四会富仕电子科技股份有限公司 | Preparation method of reticular copper foil |
| US11621411B2 (en) * | 2019-12-23 | 2023-04-04 | Intecells, Inc. | Method of insulating lithium ion electrochemical cell components with metal oxide coatings |
| CN111850628A (en) * | 2020-06-12 | 2020-10-30 | 九江德福科技股份有限公司 | Method for manufacturing punched copper foil of shielding cathode plate |
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| CN1103903A (en) * | 1993-05-28 | 1995-06-21 | 古尔德电子有限公司 | Electrodeposited copper foil and process for makin gasame using electrolyte solutions having controlled additions of chloride ions and organic additives |
| CN1134010A (en) * | 1996-01-18 | 1996-10-23 | 华中理工大学 | Method of making servo graph and separated magnetic track on film magnetic disk |
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| JP2006193825A (en) * | 2004-12-13 | 2006-07-27 | Mitsui Mining & Smelting Co Ltd | Perforated electrolytic metal foil, perforated electrolytic metal foil with carrier substrate and their production methods |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1103903A (en) * | 1993-05-28 | 1995-06-21 | 古尔德电子有限公司 | Electrodeposited copper foil and process for makin gasame using electrolyte solutions having controlled additions of chloride ions and organic additives |
| CN1134010A (en) * | 1996-01-18 | 1996-10-23 | 华中理工大学 | Method of making servo graph and separated magnetic track on film magnetic disk |
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