CN114950922A - Conductive coating foil and preparation method thereof - Google Patents
Conductive coating foil and preparation method thereof Download PDFInfo
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- CN114950922A CN114950922A CN202210673016.3A CN202210673016A CN114950922A CN 114950922 A CN114950922 A CN 114950922A CN 202210673016 A CN202210673016 A CN 202210673016A CN 114950922 A CN114950922 A CN 114950922A
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- foil
- copper
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- conductive coating
- copper foil
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- 238000000576 coating method Methods 0.000 title claims abstract description 119
- 239000011248 coating agent Substances 0.000 title claims abstract description 117
- 239000011888 foil Substances 0.000 title claims abstract description 98
- 238000002360 preparation method Methods 0.000 title abstract description 16
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims abstract description 136
- 239000011889 copper foil Substances 0.000 claims abstract description 78
- 239000010410 layer Substances 0.000 claims abstract description 45
- 239000000243 solution Substances 0.000 claims abstract description 44
- 239000006255 coating slurry Substances 0.000 claims abstract description 43
- 239000000463 material Substances 0.000 claims abstract description 21
- 238000002161 passivation Methods 0.000 claims abstract description 19
- 229910052725 zinc Inorganic materials 0.000 claims abstract description 19
- 239000011701 zinc Substances 0.000 claims abstract description 19
- 239000000853 adhesive Substances 0.000 claims abstract description 18
- 239000002270 dispersing agent Substances 0.000 claims abstract description 18
- 239000002904 solvent Substances 0.000 claims abstract description 18
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 claims abstract description 11
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 9
- 229920001145 Poly(N-vinylacetamide) Polymers 0.000 claims abstract description 9
- 229920002125 Sokalan® Polymers 0.000 claims abstract description 9
- 230000001070 adhesive effect Effects 0.000 claims abstract description 9
- 239000002041 carbon nanotube Substances 0.000 claims abstract description 9
- 229910021393 carbon nanotube Inorganic materials 0.000 claims abstract description 9
- 239000004584 polyacrylic acid Substances 0.000 claims abstract description 9
- 239000002994 raw material Substances 0.000 claims abstract description 9
- 150000003839 salts Chemical class 0.000 claims abstract description 9
- 239000002356 single layer Substances 0.000 claims abstract description 9
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 9
- 239000010949 copper Substances 0.000 claims description 74
- 229910052802 copper Inorganic materials 0.000 claims description 58
- 229910000365 copper sulfate Inorganic materials 0.000 claims description 40
- ARUVKPQLZAKDPS-UHFFFAOYSA-L copper(II) sulfate Chemical compound [Cu+2].[O-][S+2]([O-])([O-])[O-] ARUVKPQLZAKDPS-UHFFFAOYSA-L 0.000 claims description 40
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 claims description 32
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 24
- 238000004140 cleaning Methods 0.000 claims description 24
- 238000001914 filtration Methods 0.000 claims description 20
- 239000012535 impurity Substances 0.000 claims description 20
- MHAJPDPJQMAIIY-UHFFFAOYSA-N Hydrogen peroxide Chemical compound OO MHAJPDPJQMAIIY-UHFFFAOYSA-N 0.000 claims description 16
- 238000005520 cutting process Methods 0.000 claims description 16
- 150000002500 ions Chemical class 0.000 claims description 16
- 229910052742 iron Inorganic materials 0.000 claims description 16
- 239000007788 liquid Substances 0.000 claims description 16
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 10
- 229910052760 oxygen Inorganic materials 0.000 claims description 10
- 239000001301 oxygen Substances 0.000 claims description 10
- 239000003792 electrolyte Substances 0.000 claims description 9
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 claims description 8
- 150000001450 anions Chemical class 0.000 claims description 8
- 150000001768 cations Chemical class 0.000 claims description 8
- 239000000498 cooling water Substances 0.000 claims description 8
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 claims description 8
- 229910052737 gold Inorganic materials 0.000 claims description 8
- 239000010931 gold Substances 0.000 claims description 8
- 238000010438 heat treatment Methods 0.000 claims description 8
- 239000011259 mixed solution Substances 0.000 claims description 8
- 230000003647 oxidation Effects 0.000 claims description 8
- 238000007254 oxidation reaction Methods 0.000 claims description 8
- 229920000728 polyester Polymers 0.000 claims description 8
- 229920005989 resin Polymers 0.000 claims description 8
- 239000011347 resin Substances 0.000 claims description 8
- 229910052709 silver Inorganic materials 0.000 claims description 8
- 239000004332 silver Substances 0.000 claims description 8
- 239000010936 titanium Substances 0.000 claims description 8
- 229910052719 titanium Inorganic materials 0.000 claims description 8
- 238000004519 manufacturing process Methods 0.000 claims description 3
- 238000000034 method Methods 0.000 claims 5
- JPVYNHNXODAKFH-UHFFFAOYSA-N Cu2+ Chemical compound [Cu+2] JPVYNHNXODAKFH-UHFFFAOYSA-N 0.000 abstract description 5
- 229910001431 copper ion Inorganic materials 0.000 abstract description 5
- 230000003064 anti-oxidating effect Effects 0.000 abstract description 3
- 239000012266 salt solution Substances 0.000 abstract description 3
- 150000003751 zinc Chemical class 0.000 abstract description 3
- 239000000835 fiber Substances 0.000 description 7
- 238000004064 recycling Methods 0.000 description 6
- 239000000126 substance Substances 0.000 description 4
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 2
- 239000013543 active substance Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000004090 dissolution Methods 0.000 description 2
- 238000005868 electrolysis reaction Methods 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 239000011148 porous material Substances 0.000 description 2
- 230000036632 reaction speed Effects 0.000 description 2
- 241001391944 Commicarpus scandens Species 0.000 description 1
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 1
- 241000784732 Lycaena phlaeas Species 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 239000002390 adhesive tape Substances 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000011049 filling Methods 0.000 description 1
- -1 gold and silver Chemical compound 0.000 description 1
- 229910052744 lithium Inorganic materials 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000007773 negative electrode material Substances 0.000 description 1
- 239000007774 positive electrode material Substances 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D7/00—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials
- B05D7/24—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials for applying particular liquids or other fluent materials
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D5/00—Processes for applying liquids or other fluent materials to surfaces to obtain special surface effects, finishes or structures
- B05D5/12—Processes for applying liquids or other fluent materials to surfaces to obtain special surface effects, finishes or structures to obtain a coating with specific electrical properties
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D7/00—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials
- B05D7/14—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials to metal, e.g. car bodies
-
- 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
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D2202/00—Metallic substrate
- B05D2202/40—Metallic substrate based on other transition elements
- B05D2202/45—Metallic substrate based on other transition elements based on Cu
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D2502/00—Acrylic polymers
-
- 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 a conductive coating foil, which comprises double-layer coating, wherein the double-layer coating comprises conductive coating slurry, and the conductive coating slurry comprises the following raw materials in parts by weight: single-layer carbon nanotubes: adhesive agent: dispersing agent: solvent (0.02-2): (0.05-20): (0.02-20): (58-99.91), the adhesive is polyacrylic acid and salt thereof, the dispersing agent is poly-N-vinylacetamide, the solvent is water, the supporting body of the conductive coating foil is copper foil, and the conductive coating slurry is poured into a hopper of a coating machine. The conductive coating foil material and the preparation method thereof have the advantages that after electrons obtained by copper ions are reduced by a cathode, copper foil is generated, the copper foil exposed in the air can be oxidized, so that passivation solution can be added at the same time, the surface of the copper foil is passivated (namely, anti-oxidation treatment) by using zinc salt solution, a film layer with a complex structure and taking zinc as a main body is formed on the surface of the copper foil, the copper foil cannot be oxidized and discolored due to direct contact with the air, and meanwhile, the heat resistance of the copper foil is improved.
Description
Technical Field
The invention relates to the technical field of conductive coatings, in particular to a conductive coating foil and a preparation method thereof.
Background
The conductive coating comprises a metal conductive layer formed by various coating methods, a conductive adhesive tape or other special coating materials, such as a conductive paste for filling a shielding gap, which can provide excellent static conductivity, is a protective energy absorption layer and can also provide good shielding performance, an extremely thin metal sheet or strip, a foil material is used as a current collector, and is a very important production material for a lithium battery besides four main materials (a positive electrode material, a negative electrode material, an electrolyte and a diaphragm), under the condition of a certain battery space, the amount of positive and negative active substances is increased, so that the thickness of the diaphragm and the current collector can be only reduced if the positive and negative active substances are increased, of course, the thinner current collector is better, the too thin current collector is easy to break, the preheating shrinkage is fast, but in the prior art, copper ions are reduced at the cathode during electrolysis, a copper foil is produced and the copper foil exposed to air is oxidized.
Disclosure of Invention
Technical problem to be solved
Aiming at the defects of the prior art, the invention provides a conductive coating foil and a preparation method thereof, which solve the problems that copper foil is generated after electrons obtained from copper ions are reduced at a cathode during electrolysis, and the copper foil exposed in the air is oxidized.
(II) technical scheme
The invention provides the following technical scheme: the conductive coating foil comprises double-layer coating, wherein the double-layer coating comprises conductive coating slurry, and the conductive coating slurry comprises the following raw materials in parts by weight: single-layer carbon nanotubes: adhesive agent: dispersing agent: solvent (0.02-2): (0.05-20): (0.02-20): (58-99.91), the adhesive is polyacrylic acid and salt thereof, the dispersing agent is poly-N-vinylacetamide, the solvent is water, the supporting body of the conductive coating foil is copper foil, the conductive coating slurry is poured into a hopper of a coating machine, and coating is carried out on a controller according to the set coating temperature, speed and speed ratio.
A preparation method of a conductive coating foil comprises the following steps:
s1: putting copper wires with the content of more than 95% into a copper dissolving tank body containing sulfuric acid, heating, and injecting oxygen to obtain copper sulfate liquid;
s2: filtering the copper sulfate liquid obtained in the step (1) through a multi-stage filter screen;
s3: heat is replaced through a double-layer pipeline, copper sulfate solution flows through the inner part, and cooling water flows through the outer layer;
s4: pouring copper sulfate solution into the interior of an electrolytic tank, adopting a titanium roller as a cathode roller, adopting a pure copper plate as an anode seat, adopting copper sulfate as electrolyte, introducing direct current, under the action of the direct current, moving cations to the cathode, moving anions to the anode, and adding Cu on the cathode 2+ Reducing 2 electrons into Cu, crystallizing on a cathode roller to form a raw foil, and dissolving impurities in the crude copper, such as iron, zinc and the like which are more active than the copper, into ions (Zn and Fe) along with the copper to obtain the raw foil;
s5: cleaning the surface of the green foil obtained in the step 4 by using a cleaning solution to remove oxidation and etch the surface;
s6: simultaneously adding a passivation solution into the electrolytic bath in the step 4 to passivate the surface of the copper foil;
s7: cutting the foil material subjected to the raw foil passivation in the step 6 by using a copper foil cutting machine;
s8: coating the copper foil obtained in the step 7 by a coating roller of a coating machine, and then coating a layer of conductive coating slurry with the thickness of 1-3 mu m;
s9: and (5) putting the copper foil into an oven to dry the copper foil, so that the conductive coating slurry is firmly bonded on the copper foil.
Preferably, the material of the filtering screen in the step 2 is selected from resin, polyester fiber and the like.
Preferably, impurities inactive to copper such as gold and silver, etc. in the step 4 are deposited on the bottom of the electrolytic bath.
Preferably, the potential difference is adjusted in step 4 to avoid the precipitation of these ions at the cathode.
Preferably, the smoothness of the foil obtained in step 6 is measured.
Preferably, the unqualified foil is recycled.
Preferably, the cleaning solution is treated by sulfuric acid, hydrogen peroxide or a mixed solution thereof.
(III) advantageous effects
Compared with the prior art, the invention provides a conductive coating foil and a preparation method thereof, and the conductive coating foil has the following beneficial effects:
1. the conductive coating foil material and the preparation method thereof have the advantages that after electrons obtained by copper ions are reduced by a cathode, copper foil is generated, the copper foil exposed in the air can be oxidized, so that passivation solution can be added at the same time, the surface of the copper foil is passivated (namely, anti-oxidation treatment) by using zinc salt solution, a film layer with a complex structure and taking zinc as a main body is formed on the surface of the copper foil, the copper foil cannot be oxidized and discolored due to direct contact with the air, and meanwhile, the heat resistance of the copper foil is improved.
2. The conductive coating foil and the preparation method thereof are characterized in that the filtering is divided into multiple stages, primary filtering is carried out, the mesh number of the screen is small, the pore diameter is large, large substances in the primary filtering are mainly intercepted, the diatomite is used for filtering and adsorbing some impurities, and the fine filtering is also carried out, the mesh number of the screen is large, the pore diameter is small, and the impurities in the fine filtering and some large undissolved substances can be filtered.
3. According to the conductive coating foil and the preparation method thereof, oxygen is added during copper dissolution, so that the reaction speed is also accelerated.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The first embodiment is as follows: the conductive coating foil comprises double-layer coating, wherein the double-layer coating comprises conductive coating slurry, and the conductive coating slurry comprises the following raw materials in parts by weight: single-layer carbon nanotubes: adhesive agent: dispersing agent: solvent 0.02: 0.05: 0.02: 58, the adhesive is polyacrylic acid and salt thereof, the dispersant is poly-N-vinylacetamide, the solvent is water, the supporting body of the conductive coating foil is copper foil, the conductive coating slurry is poured into a hopper of a coating machine, and coating is carried out on a controller according to the set coating temperature, speed and speed ratio.
A preparation method of a conductive coating foil comprises the following steps:
s1: putting copper wires with the content of more than 95% into a copper dissolving tank body containing sulfuric acid, heating, and injecting oxygen to obtain copper sulfate liquid;
s2: filtering the copper sulfate liquid obtained in the step (1) through a multi-stage filter screen;
s3: heat is replaced through a double-layer pipeline, copper sulfate solution flows through the inner part, and cooling water flows through the outer layer;
s4: pouring copper sulfate solution into the interior of an electrolytic tank, adopting a titanium roller as a cathode roller, adopting a pure copper plate as an anode seat, adopting copper sulfate as electrolyte, introducing direct current, under the action of the direct current, moving cations to the cathode, moving anions to the anode, and adding Cu on the cathode 2+ Reducing 2 electrons into Cu, crystallizing on a cathode roller to form a raw foil, and dissolving impurities in the crude copper, such as iron, zinc and the like which are more active than the copper, into ions (Zn and Fe) along with the copper to obtain the raw foil;
s5: cleaning the surface of the green foil obtained in the step (4) by using a cleaning solution to remove oxidation and etch the surface;
s6: simultaneously adding a passivation solution into the electrolytic bath in the step 4 to passivate the surface of the copper foil;
s7: cutting the foil material subjected to the raw foil passivation in the step 6 by using a copper foil cutting machine;
s8: coating the copper foil obtained in the step 7 by a coating roller of a coating machine, and then coating conductive coating slurry with the thickness of 1 mu m;
s9: and putting the copper foil into an oven for drying to ensure that the conductive coating slurry is firmly bonded on the copper foil.
And 2, selecting resin or polyester fiber as the material of the filter screen.
Impurities such as gold and silver, which are less noble than copper in step 4, are deposited at the bottom of the cell.
And 4, adjusting the potential difference to avoid the ions from being separated out on the cathode.
And 6, detecting the smoothness of the foil obtained in the step 6.
And (5) recycling the unqualified foil.
The cleaning solution is treated by sulfuric acid, hydrogen peroxide or a mixed solution thereof.
Example two: the conductive coating foil comprises double-layer coating, wherein the double-layer coating comprises conductive coating slurry, and the conductive coating slurry comprises the following raw materials in parts by weight: single-layer carbon nanotube: adhesive agent: dispersing agent: solvent 0.02: 0.05: 0.02: 59, the adhesive is polyacrylic acid and salt thereof, the dispersant is poly-N-vinylacetamide, the solvent is water, the supporting body of the conductive coating foil is copper foil, the conductive coating slurry is poured into a hopper of a coating machine, and the coating temperature, the coating speed and the coating speed ratio are set on a controller.
A preparation method of a conductive coating foil comprises the following steps:
s1: putting copper wires with the content of more than 95% into a copper dissolving tank body containing sulfuric acid, heating, and injecting oxygen to obtain copper sulfate liquid;
s2: filtering the copper sulfate liquid obtained in the step (1) through a multi-stage filter screen;
s3: heat is replaced through a double-layer pipeline, copper sulfate solution flows through the inner part, and cooling water flows through the outer layer;
s4: pouring copper sulfate solution into the interior of an electrolytic tank, adopting a titanium roller as a cathode roller, adopting a pure copper plate as an anode seat, adopting copper sulfate as electrolyte, introducing direct current, under the action of the direct current, moving cations to the cathode, moving anions to the anode, and adding Cu on the cathode 2+ Reducing 2 electrons into Cu, crystallizing on a cathode roller to form a raw foil, and dissolving impurities in the crude copper, such as iron and zinc which are more active than the copper, into ions (Zn and Fe) along with the copper to obtain the raw foil;
s5: cleaning the surface of the green foil obtained in the step 4 by using a cleaning solution to remove oxidation and etch the surface;
s6: simultaneously adding a passivation solution into the electrolytic bath in the step 4 to passivate the surface of the copper foil;
s7: cutting the foil material subjected to the raw foil passivation in the step 6 by using a copper foil cutting machine;
s8: coating the copper foil obtained in the step 7 by a coating roller of a coating machine, and then coating a layer of conductive coating slurry with the thickness of 1 mu m;
s9: and (5) putting the copper foil into an oven to dry the copper foil, so that the conductive coating slurry is firmly bonded on the copper foil.
And 2, selecting resin or polyester fiber as the material of the filter screen.
Impurities such as gold and silver, which are less noble than copper in step 4, are deposited at the bottom of the cell.
And 4, adjusting the potential difference to avoid the ions from being separated out on the cathode.
And 6, detecting the smoothness of the foil obtained in the step 6.
And (5) recycling the unqualified foil.
The cleaning solution is treated by sulfuric acid, hydrogen peroxide or a mixed solution thereof.
Example three: the conductive coating foil comprises double-layer coating, wherein the double-layer coating comprises conductive coating slurry, and the conductive coating slurry comprises the following raw materials in parts by weight: single-layer carbon nanotubes: adhesive agent: dispersing agent: solvent 0.02: 0.05: 0.02: 60, the adhesive is polyacrylic acid and salt thereof, the dispersing agent is poly-N-vinylacetamide, the solvent is water, the supporting body of the conductive coating foil is copper foil, the conductive coating slurry is poured into a hopper of a coating machine, and coating is carried out on a controller according to the set coating temperature, speed and speed ratio.
A preparation method of a conductive coating foil comprises the following steps:
s1: putting copper wires with the content of more than 95% into a copper dissolving tank body containing sulfuric acid, heating, and injecting oxygen to obtain copper sulfate liquid;
s2: filtering the copper sulfate liquid obtained in the step (1) through a multi-stage filter screen;
s3: heat is replaced through a double-layer pipeline, copper sulfate solution flows through the inner part, and cooling water flows through the outer layer;
s4: pouring copper sulfate solution into the interior of an electrolytic tank, adopting a titanium roller as a cathode roller, adopting a pure copper plate as an anode seat, adopting copper sulfate as electrolyte, introducing direct current, under the action of the direct current, moving cations to the cathode, moving anions to the anode, and adding Cu on the cathode 2+ Reducing 2 electrons into Cu, crystallizing on a cathode roller to form a raw foil, and dissolving impurities in the crude copper, such as iron, zinc and the like which are more active than the copper, into ions (Zn and Fe) along with the copper to obtain the raw foil;
s5: cleaning the surface of the green foil obtained in the step 4 by using a cleaning solution to remove oxidation and etch the surface;
s6: simultaneously adding a passivation solution into the electrolytic bath in the step 4 to passivate the surface of the copper foil;
s7: cutting the foil material subjected to the raw foil passivation in the step 6 by using a copper foil cutting machine;
s8: coating the copper foil obtained in the step 7 by a coating roller of a coating machine, and then coating a layer of conductive coating slurry with the thickness of 1 mu m;
s9: and (5) putting the copper foil into an oven to dry the copper foil, so that the conductive coating slurry is firmly bonded on the copper foil.
And 2, selecting resin or polyester fiber as the material of the filter screen.
Impurities such as gold and silver, which are less noble than copper in step 4, are deposited at the bottom of the cell.
And 4, regulating the potential difference to avoid the ions from being separated out on the cathode.
And 6, detecting the smoothness of the foil obtained in the step 6.
And (5) recycling the unqualified foil.
The cleaning solution is treated by sulfuric acid, hydrogen peroxide or a mixed solution thereof.
Experimental example four: the conductive coating foil comprises double-layer coating, wherein the double-layer coating comprises conductive coating slurry, and the conductive coating slurry comprises the following raw materials in parts by weight: single-layer carbon nanotubes: adhesive agent: dispersing agent: solvent 0.02: 0.05: 0.02: 61, the adhesive is polyacrylic acid and salt thereof, the dispersant is poly-N-vinylacetamide, the solvent is water, the supporting body of the conductive coating foil is copper foil, the conductive coating slurry is poured into a hopper of a coating machine, and coating is carried out on a controller according to the set coating temperature, speed and speed ratio.
A preparation method of a conductive coating foil comprises the following steps:
s1: putting copper wires with the content of more than 95% into a copper dissolving tank body containing sulfuric acid, heating, and injecting oxygen to obtain copper sulfate liquid;
s2: filtering the copper sulfate liquid obtained in the step (1) through a multi-stage filter screen;
s3: heat is replaced through a double-layer pipeline, copper sulfate solution flows through the inner part, and cooling water flows through the outer layer;
s4: pouring copper sulfate solution into the interior of an electrolytic tank, adopting a titanium roller as a cathode roller, adopting a pure copper plate as an anode seat, adopting copper sulfate as electrolyte, introducing direct current, under the action of the direct current, moving cations to the cathode, moving anions to the anode, and adding Cu on the cathode 2+ Reducing 2 electrons into Cu, crystallizing on a cathode roller to form a raw foil, and dissolving impurities in the crude copper, such as iron, zinc and the like which are more active than the copper, into ions (Zn and Fe) along with the copper to obtain the raw foil;
s5: cleaning the surface of the green foil obtained in the step 4 by using a cleaning solution to remove oxidation and etch the surface;
s6: simultaneously adding a passivation solution into the electrolytic bath in the step 4 to passivate the surface of the copper foil;
s7: cutting the foil material subjected to the raw foil passivation in the step 6 by using a copper foil cutting machine;
s8: coating the copper foil obtained in the step 7 by a coating roller of a coating machine, and then coating conductive coating slurry with the thickness of 3 mu m;
s9: and (5) putting the copper foil into an oven to dry the copper foil, so that the conductive coating slurry is firmly bonded on the copper foil.
And 2, selecting resin or polyester fiber as the material of the filter screen.
Impurities such as gold and silver, which are less noble than copper in step 4, are deposited at the bottom of the cell.
And 4, adjusting the potential difference to avoid the ions from being separated out on the cathode.
And 6, detecting the smoothness of the foil obtained in the step 6.
And (5) recycling the unqualified foil.
The cleaning solution is treated by sulfuric acid, hydrogen peroxide or a mixed solution thereof.
Experimental example five: the conductive coating foil comprises double-layer coating, wherein the double-layer coating comprises conductive coating slurry, and the conductive coating slurry comprises the following raw materials in parts by weight: single-layer carbon nanotubes: adhesive agent: dispersing agent: solvent 0.02: 0.06: 0.02: 59, the adhesive is polyacrylic acid and salt thereof, the dispersant is poly-N-vinylacetamide, the solvent is water, the supporting body of the conductive coating foil is copper foil, the conductive coating slurry is poured into a hopper of a coating machine, and the coating temperature, the coating speed and the coating speed ratio are set on a controller.
A preparation method of a conductive coating foil comprises the following steps:
s1: putting copper wires with the content of more than 95% into a copper dissolving tank body containing sulfuric acid, heating, and injecting oxygen to obtain copper sulfate liquid;
s2: filtering the copper sulfate liquid obtained in the step (1) through a multi-stage filter screen;
s3: heat is replaced through a double-layer pipeline, copper sulfate solution flows through the inner part, and cooling water flows through the outer layer;
s4: pouring copper sulfate solution into the interior of an electrolytic tank, adopting a titanium roller as a cathode roller, adopting a pure copper plate as an anode seat, adopting copper sulfate as electrolyte, introducing direct current, under the action of the direct current, moving cations to the cathode, moving anions to the anode, and adding Cu on the cathode 2+ Reducing 2 electrons into Cu, crystallizing on a cathode roller to form a raw foil, and dissolving impurities in the crude copper, such as iron, zinc and the like which are more active than the copper, into ions (Zn and Fe) along with the copper to obtain the raw foil;
s5: cleaning the surface of the green foil obtained in the step 4 by using a cleaning solution to remove oxidation and etch the surface;
s6: simultaneously adding a passivation solution into the electrolytic bath in the step 4 to passivate the surface of the copper foil;
s7: cutting the foil material subjected to the raw foil passivation in the step 6 by using a copper foil cutting machine;
s8: coating the copper foil obtained in the step 7 by a coating roller of a coating machine, and then coating a layer of conductive coating slurry with the thickness of 3 mu m;
s9: and (5) putting the copper foil into an oven to dry the copper foil, so that the conductive coating slurry is firmly bonded on the copper foil.
And 2, selecting resin or polyester fiber as the material of the filter screen.
Impurities such as gold and silver, which are less noble than copper in step 4, are deposited at the bottom of the cell.
And 4, adjusting the potential difference to avoid the ions from being separated out on the cathode.
And 6, detecting the smoothness of the foil obtained in the step 6.
And (5) recycling the unqualified foil.
The cleaning solution is treated by sulfuric acid, hydrogen peroxide or a mixed solution thereof.
Experimental example six: the conductive coating foil comprises double-layer coating, wherein the double-layer coating comprises conductive coating slurry, and the conductive coating slurry comprises the following raw materials in parts by weight: single-layer carbon nanotubes: adhesive agent: dispersing agent: solvent 0.02: 0.06: 0.03: 59, the adhesive is polyacrylic acid and salt thereof, the dispersant is poly-N-vinylacetamide, the solvent is water, the supporting body of the conductive coating foil is copper foil, the conductive coating slurry is poured into a hopper of a coating machine, and the coating temperature, the coating speed and the coating speed ratio are set on a controller.
A preparation method of a conductive coating foil comprises the following steps:
s1: putting copper wires with the content of more than 95% into a copper dissolving tank body containing sulfuric acid, heating, and injecting oxygen to obtain copper sulfate liquid;
s2: filtering the copper sulfate liquid obtained in the step (1) through a multi-stage filter screen;
s3: heat is replaced through a double-layer pipeline, copper sulfate solution flows through the inner part, and cooling water flows through the outer layer;
s4: pouring copper sulfate solution into the interior of an electrolytic tank, adopting a titanium roller as a cathode roller, adopting a pure copper plate as an anode seat, adopting copper sulfate as electrolyte, introducing direct current, under the action of the direct current, moving cations to the cathode, moving anions to the anode, and adding Cu on the cathode 2+ Reducing 2 electrons into Cu, crystallizing on a cathode roller to form a raw foil, and dissolving impurities in the crude copper, such as iron and zinc which are more active than the copper, into ions (Zn and Fe) along with the copper to obtain the raw foil;
s5: cleaning the surface of the green foil obtained in the step (4) by using a cleaning solution to remove oxidation and etch the surface;
s6: simultaneously adding a passivation solution into the electrolytic bath in the step 4 to passivate the surface of the copper foil;
s7: cutting the foil material subjected to the raw foil passivation in the step 6 by using a copper foil cutting machine;
s8: coating the copper foil obtained in the step 7 by a coating roller of a coating machine, and then coating a layer of conductive coating slurry with the thickness of 2 mu m;
s9: and (5) putting the copper foil into an oven to dry the copper foil, so that the conductive coating slurry is firmly bonded on the copper foil.
And 2, selecting resin or polyester fiber as the material of the filter screen.
Impurities such as gold and silver, which are less noble than copper in step 4, are deposited at the bottom of the cell.
And 4, adjusting the potential difference to avoid the ions from being separated out on the cathode.
And 6, detecting the smoothness of the foil obtained in the step 6.
And (5) recycling the unqualified foil.
The cleaning solution is treated by sulfuric acid, hydrogen peroxide or a mixed solution thereof.
The invention has the beneficial effects that: copper ions are obtained and electrons are reduced by a cathode, so that a copper foil is generated, the copper foil exposed in the air can be oxidized, a passivation solution can be added at the same time, the surface of the common copper foil is passivated (namely anti-oxidation treatment) by using a zinc salt solution, a film layer which takes zinc as a main body and has a complex structure is formed on the surface of the copper foil, the copper foil can not be oxidized and discolored due to direct contact with the air, the heat resistance of the copper foil is improved, the filtration is divided into multiple stages, primary filtration is realized, the mesh number of a screen is small, the aperture is large, large substances in the screen are mainly intercepted, diatomite filtration is realized, impurities are adsorbed, precise filtration is also realized, the mesh number of the screen is large, the aperture is small, the impurities in the screen and large undissolved substances can be filtered, and the reaction speed is also accelerated by adding oxygen during copper dissolution
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (8)
1. The conductive coating foil comprises double-layer coating and is characterized in that the double-layer coating comprises conductive coating slurry, and the conductive coating slurry comprises the following raw materials in parts by weight: single-layer carbon nanotubes: adhesive agent: dispersing agent: solvent (0.02-2): (0.05-20): (0.02-20): (58-99.91), the adhesive is polyacrylic acid and salt thereof, the dispersing agent is poly-N-vinylacetamide, the solvent is water, the supporting body of the conductive coating foil is copper foil, the conductive coating slurry is poured into a hopper of a coating machine, and coating is carried out on a controller according to the set coating temperature, speed and speed ratio.
2. The method for preparing a conductive coated foil according to claim 1, comprising the steps of:
s1: putting copper wires with the content of more than 95% into a copper dissolving tank body containing sulfuric acid, heating, and injecting oxygen to obtain copper sulfate liquid;
s2: filtering the copper sulfate liquid obtained in the step (1) through a multi-stage filter screen;
s3: heat is replaced through a double-layer pipeline, copper sulfate solution flows through the inner part, and cooling water flows through the outer layer;
s4: pouring copper sulfate solution into the interior of an electrolytic tank, adopting a titanium roller as a cathode roller, adopting a pure copper plate as an anode seat, adopting copper sulfate as electrolyte, introducing direct current, under the action of the direct current, moving cations to the cathode, moving anions to the anode, and adding Cu on the cathode 2+ Reducing 2 electrons into Cu, crystallizing on a cathode roller to form a raw foil, and dissolving impurities in the crude copper, such as iron, zinc and the like which are more active than the copper, into ions (Zn and Fe) along with the copper to obtain the raw foil;
s5: cleaning the surface of the green foil obtained in the step 4 by using a cleaning solution to remove oxidation and etch the surface;
s6: simultaneously adding a passivation solution into the electrolytic bath in the step 4 to passivate the surface of the copper foil;
s7: cutting the foil material subjected to the raw foil passivation in the step 6 by using a copper foil cutting machine;
s8: coating the copper foil obtained in the step 7 by a coating roller of a coating machine, and then coating a layer of conductive coating slurry with the thickness of 1-3 mu m;
s9: and (5) putting the copper foil into an oven to dry the copper foil, so that the conductive coating slurry is firmly bonded on the copper foil.
3. The method as claimed in claim 2, wherein the filtering screen of step 2 is made of resin or polyester.
4. A method for producing a conductive coated foil according to claim 2, wherein impurities inert to copper such as gold and silver are deposited on the bottom of the electrolytic bath in step 4.
5. The method for preparing an electrically conductive coated foil according to claim 2, wherein the potential difference is adjusted in step 4 to prevent the ions from being precipitated on the cathode.
6. The method for producing a conductive-coated foil according to claim 2, wherein the smoothness of the foil obtained in step 6 is measured.
7. The method for preparing a conductive coating foil as claimed in claim 2, wherein the rejected foil is recycled.
8. The method for preparing the conductive coating foil according to claim 2, wherein the cleaning solution is treated with sulfuric acid, hydrogen peroxide or a mixed solution thereof.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108560025A (en) * | 2018-06-14 | 2018-09-21 | 九江德福科技股份有限公司 | A kind of preparation method of electrolytic copper foil |
| CN110783572A (en) * | 2019-11-05 | 2020-02-11 | 广州纳诺新材料科技有限公司 | Secondary battery current collector, conductive paste and preparation method thereof |
| CN111364072A (en) * | 2020-04-23 | 2020-07-03 | 广东嘉元科技股份有限公司 | High-ductility electrolytic copper foil and preparation method thereof |
| TWI711210B (en) * | 2019-08-05 | 2020-11-21 | 國立清華大學 | Carbon conductive coating |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108560025A (en) * | 2018-06-14 | 2018-09-21 | 九江德福科技股份有限公司 | A kind of preparation method of electrolytic copper foil |
| TWI711210B (en) * | 2019-08-05 | 2020-11-21 | 國立清華大學 | Carbon conductive coating |
| CN110783572A (en) * | 2019-11-05 | 2020-02-11 | 广州纳诺新材料科技有限公司 | Secondary battery current collector, conductive paste and preparation method thereof |
| CN111364072A (en) * | 2020-04-23 | 2020-07-03 | 广东嘉元科技股份有限公司 | High-ductility electrolytic copper foil and preparation method thereof |
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