CN111534243A - Carbon-coated aluminum foil conductive adhesive tape for lithium battery and preparation method thereof - Google Patents
Carbon-coated aluminum foil conductive adhesive tape for lithium battery and preparation method thereof Download PDFInfo
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- CN111534243A CN111534243A CN202010380598.7A CN202010380598A CN111534243A CN 111534243 A CN111534243 A CN 111534243A CN 202010380598 A CN202010380598 A CN 202010380598A CN 111534243 A CN111534243 A CN 111534243A
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- aluminum foil
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J7/00—Adhesives in the form of films or foils
- C09J7/20—Adhesives in the form of films or foils characterised by their carriers
- C09J7/28—Metal sheet
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J133/00—Adhesives based on homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by only one carboxyl radical, or of salts, anhydrides, esters, amides, imides, or nitriles thereof; Adhesives based on derivatives of such polymers
- C09J133/04—Homopolymers or copolymers of esters
- C09J133/06—Homopolymers or copolymers of esters of esters containing only carbon, hydrogen and oxygen, the oxygen atom being present only as part of the carboxyl radical
- C09J133/08—Homopolymers or copolymers of acrylic acid esters
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J9/00—Adhesives characterised by their physical nature or the effects produced, e.g. glue sticks
- C09J9/02—Electrically-conducting adhesives
-
- 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
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K2201/00—Specific properties of additives
- C08K2201/011—Nanostructured additives
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J2203/00—Applications of adhesives in processes or use of adhesives in the form of films or foils
- C09J2203/326—Applications of adhesives in processes or use of adhesives in the form of films or foils for bonding electronic components such as wafers, chips or semiconductors
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J2400/00—Presence of inorganic and organic materials
- C09J2400/10—Presence of inorganic materials
- C09J2400/16—Metal
- C09J2400/163—Metal in the substrate
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J2433/00—Presence of (meth)acrylic polymer
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M2200/00—Safety devices for primary or secondary 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
- 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 carbon-coated aluminum foil conductive adhesive tape for a lithium battery, which comprises an aluminum foil substrate and an adhesive layer, wherein the adhesive layer comprises the following components in parts by weight: 70-90 parts of acrylate polymer, 1-5 parts of polydopamine coated conductive filler with sulfydryl on the surface, 1-2 parts of curing agent and 10-30 parts of solvent; the invention also discloses a preparation method of the carbon-coated aluminum foil conductive adhesive tape for the lithium battery. The invention adopts polydopamine with sulfydryl on the surface to coat the conductive filler, effectively improves the dispersibility of the conductive filler in the acrylate adhesive, improves the conductivity of the adhesive and improves the adhesive property of the coating.
Description
Technical Field
The invention relates to the technical field of aluminum foil materials, in particular to a carbon-coated aluminum foil conductive adhesive tape for a lithium battery and a preparation method thereof.
Background
The conductive aluminum foil adhesive tape for protection is required to be used in lithium battery assembly application, and has the functions of eliminating electromagnetic interference (EMI), isolating the harm of electromagnetic waves to human bodies and avoiding the influence of voltage and current on the functions. In addition, the current collector is protected from being corroded by electrolyte, and the good effect of electrostatic discharge after grounding is achieved. The conductive aluminum foil tape consists of an aluminum foil base material and a binder coated on the surface of the base material, conductive particles are added into the binder in order to improve the conductivity of the aluminum foil tape, but the conductive effect of an adhesive layer is directly influenced due to poor dispersibility of the conductive particles in resin. Therefore, improving the conductivity of the adhesive layer is the key to improve the conductivity of the conductive aluminum foil tape.
Disclosure of Invention
The invention provides a carbon-coated aluminum foil conductive adhesive tape for a lithium battery, which is characterized in that a conductive filler is coated by polydopamine with a surface containing sulfydryl, so that the dispersibility of the conductive filler in an acrylate polymer adhesive is effectively improved, the conductivity of a binder is improved, and the binding performance of a coating is improved.
The invention provides a carbon-coated aluminum foil conductive adhesive tape for a lithium battery, which comprises an aluminum foil substrate and an adhesive layer, wherein the adhesive layer comprises the following components in parts by weight: 70-90 parts of acrylate polymer, 1-5 parts of polydopamine coated conductive filler with sulfydryl on the surface, 1-2 parts of curing agent and 10-30 parts of solvent.
Preferably, the conductive filler in the polydopamine-coated conductive filler with the surface containing sulfydryl is one or a mixture of more than two of carbon nanotubes, graphene, carbon black and conductive glass fibers.
Preferably, the preparation process of the polydopamine coated conductive filler with the surface containing sulfydryl comprises the following steps: ultrasonically dispersing a conductive filler in an aqueous solution, adding dopamine hydrochloride under the stirring condition, stirring for reaction for 10-20min, adding a Tris buffer solution to adjust the pH value to 8-9, and continuing to react for 15-20h to obtain a polydopamine coated conductive filler; and ultrasonically dispersing the polydopamine-coated conductive filler in a Tris buffer solution, adding mercaptopropionic acid, and stirring for reacting for 1-2h to obtain the polydopamine-coated conductive filler with the surface containing sulfydryl.
Preferably, the weight ratio of the conductive filler to the dopamine hydrochloride is 1-2: 1; the weight ratio of the polydopamine-coated conductive filler to the mercaptopropionic acid is 1-1.5: 1.
preferably, the curing agent is one of isocyanate, imidazole, triethylamine and 2-ethyl-4-methylimidazole.
Preferably, the solvent is ethyl acetate or toluene.
Preferably, the solvent is ethyl acetate.
The invention also provides a preparation method of the carbon-coated aluminum foil conductive adhesive tape for the lithium battery, which comprises the following steps: uniformly mixing an acrylate polymer, a polydopamine coated conductive filler with a sulfydryl surface, a curing agent and a solvent according to a weight ratio to obtain an adhesive; and coating the adhesive on the surface of the aluminum foil substrate, and curing to obtain the carbon-coated aluminum foil conductive adhesive tape for the lithium battery.
Preferably, the curing temperature is 70-90 ℃ and the curing time is 5-10 min.
Preferably, the adhesive coating has a thickness of 10-30 microns.
On the basis of the traditional acrylate adhesive, the conductive filler is coated by the polydopamine with the surface containing sulfydryl, so that the agglomeration phenomenon of the conductive filler is effectively improved, and the conductive filler can be well dispersed in the acrylate adhesive, so that the conductive performance of the adhesive is improved; meanwhile, the mercapto group on the surface of the polydopamine and the double bonds in the acrylate polymer are subjected to click reaction to form a network structure in a binder system, so that the binding strength is greatly enhanced, the heat resistance of the binder is facilitated, and the binding performance of the binder is further improved by introducing the polydopamine.
Detailed Description
The technical solution of the present invention will be described in detail below with reference to specific examples.
Example 1
The carbon-coated aluminum foil conductive adhesive tape for the lithium battery comprises an aluminum foil substrate and an adhesive layer, wherein the adhesive layer comprises the following components in parts by weight: 70 parts of acrylate polymer, 1 part of polydopamine coated conductive filler with a mercapto group on the surface, 1 part of isocyanate and 10 parts of ethyl acetate;
the preparation process of the polydopamine coated conductive filler with the surface containing sulfydryl comprises the following steps: ultrasonically dispersing carbon nano tubes in an aqueous solution, adding dopamine hydrochloride under the stirring condition, stirring for reaction for 10min, adding a Tris buffer solution to adjust the pH value to 8.5, and continuing the reaction for 15h to obtain a polydopamine-coated conductive filler; ultrasonically dispersing the polydopamine-coated conductive filler in a Tris buffer solution, adding mercaptopropionic acid, and stirring for reacting for 1h to obtain the polydopamine-coated conductive filler with the surface containing sulfydryl; wherein the weight ratio of the carbon nano tube to the dopamine hydrochloride is 1: 1; the weight ratio of the polydopamine-coated conductive filler to the mercaptopropionic acid is 1: 1;
the preparation method of the carbon-coated aluminum foil conductive adhesive tape for the lithium battery comprises the following steps: uniformly mixing an acrylate polymer, a polydopamine coated conductive filler with a sulfydryl on the surface, isocyanate and ethyl acetate according to a weight ratio to obtain an adhesive; coating the adhesive on the surface of an aluminum foil substrate, and curing at 70 ℃ for 10min to obtain the carbon-coated aluminum foil conductive adhesive tape adhesive for the lithium battery; the thickness of the adhesive coating was 10 microns.
Example 2
The carbon-coated aluminum foil conductive adhesive tape for the lithium battery comprises an aluminum foil substrate and an adhesive layer, wherein the adhesive layer comprises the following components in parts by weight: 90 parts of acrylate polymer, 5 parts of polydopamine coated conductive filler with sulfydryl on the surface, 2 parts of imidazole and 30 parts of toluene;
the preparation process of the polydopamine coated conductive filler with the surface containing sulfydryl comprises the following steps: ultrasonically dispersing graphene in an aqueous solution, adding dopamine hydrochloride under the stirring condition, stirring for reacting for 20min, adding a Tris buffer solution to adjust the pH value to 8.5, and continuing to react for 20h to obtain a polydopamine-coated conductive filler; ultrasonically dispersing the polydopamine-coated conductive filler in a Tris buffer solution, adding mercaptopropionic acid, and stirring for reacting for 1h to obtain the polydopamine-coated conductive filler with the surface containing sulfydryl; wherein the weight ratio of graphene to dopamine hydrochloride is 1: 1; the weight ratio of the polydopamine-coated conductive filler to the mercaptopropionic acid is 1.5: 1;
the preparation method of the carbon-coated aluminum foil conductive adhesive tape for the lithium battery comprises the following steps: uniformly mixing an acrylate polymer, a polydopamine-coated conductive filler with a surface containing sulfydryl, imidazole and toluene according to a weight ratio to obtain an adhesive; coating the adhesive on the surface of an aluminum foil substrate, and curing at 90 ℃ for 5min to obtain the carbon-coated aluminum foil conductive adhesive tape for the lithium battery; the thickness of the adhesive coating was 30 microns.
Example 3
The carbon-coated aluminum foil conductive adhesive tape for the lithium battery comprises an aluminum foil substrate and an adhesive layer, wherein the adhesive layer comprises the following components in parts by weight: 80 parts of acrylate polymer, 3 parts of polydopamine coated conductive filler with sulfydryl on the surface, 1.5 parts of triethylamine and 20 parts of ethyl acetate;
the preparation process of the polydopamine coated conductive filler with the surface containing sulfydryl comprises the following steps: ultrasonically dispersing graphene and conductive glass fibers in an aqueous solution, adding dopamine hydrochloride under the stirring condition, stirring for reacting for 15min, adding a Tris buffer solution to adjust the pH value to 8.5, and continuing to react for 18h to obtain a polydopamine-coated conductive filler; ultrasonically dispersing the polydopamine-coated conductive filler in a Tris buffer solution, adding mercaptopropionic acid, and stirring for reacting for 1h to obtain the polydopamine-coated conductive filler with the surface containing sulfydryl; wherein the weight ratio of the total amount of the graphene and the conductive glass fibers to the dopamine hydrochloride is 1.5: 1, wherein the weight ratio of the graphene to the conductive glass fiber is 1: 1; the weight ratio of the polydopamine-coated conductive filler to the mercaptopropionic acid is 1.3: 1;
the preparation method of the carbon-coated aluminum foil conductive adhesive tape for the lithium battery comprises the following steps: uniformly mixing an acrylate polymer, a polydopamine-coated conductive filler with a surface containing sulfydryl, triethylamine and ethyl acetate according to a weight ratio to obtain an adhesive; coating the adhesive on the surface of an aluminum foil substrate, and curing at 80 ℃ for 8min to obtain the carbon-coated aluminum foil conductive adhesive tape for the lithium battery; the adhesive coating thickness was 20 microns.
Example 4
The carbon-coated aluminum foil conductive adhesive tape for the lithium battery comprises an aluminum foil substrate and an adhesive layer, wherein the adhesive layer comprises the following components in parts by weight: 80 parts of acrylate polymer, 3 parts of polydopamine-coated conductive filler with sulfydryl on the surface, 1.5 parts of 2-ethyl-4-methylimidazole and 20 parts of ethyl acetate;
the preparation process of the polydopamine coated conductive filler with the surface containing sulfydryl comprises the following steps: ultrasonically dispersing carbon nanotubes and carbon black in an aqueous solution, adding dopamine hydrochloride under the stirring condition, stirring for reacting for 15min, adding a Tris buffer solution to adjust the pH value to 8.5, and continuing to react for 18h to obtain a polydopamine-coated conductive filler; ultrasonically dispersing the polydopamine-coated conductive filler in a Tris buffer solution, adding mercaptopropionic acid, and stirring for reacting for 1h to obtain the polydopamine-coated conductive filler with the surface containing sulfydryl; wherein the weight ratio of the total amount of the carbon nanotubes and the carbon black to the dopamine hydrochloride is 1.5: 1, wherein the weight ratio of the carbon nanotubes to the carbon black is 1: 1; the weight ratio of the polydopamine-coated conductive filler to the mercaptopropionic acid is 1.3: 1;
the preparation method of the carbon-coated aluminum foil conductive adhesive tape for the lithium battery comprises the following steps: uniformly mixing an acrylate polymer, a polydopamine-coated conductive filler with a mercapto group on the surface, 2-ethyl-4-methylimidazole and ethyl acetate according to a weight ratio to obtain an adhesive; coating the adhesive on the surface of an aluminum foil substrate, and curing at 80 ℃ for 8min to obtain the carbon-coated aluminum foil conductive adhesive tape for the lithium battery; the adhesive coating thickness was 20 microns.
Comparative example
The same as example 4, except that the poly dopamine coating conductive filler containing mercapto group on the surface is converted into carbon nano tube and carbon black.
The carbon-coated aluminum foil conductive tapes for lithium batteries obtained in examples 1 to 4 and the comparative example were subjected to performance tests, and the test results are shown below:
the test results show that the conductive filler is coated by the polydopamine with the surface containing the sulfydryl, so that the dispersity of the conductive filler is effectively improved, the conductivity and the glass strength of the bonding layer are improved, and the heat resistance is improved.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention should be equivalent or changed within the scope of the present invention.
Claims (9)
1. The carbon-coated aluminum foil conductive adhesive tape for the lithium battery is characterized by comprising an aluminum foil substrate and an adhesive layer, wherein the adhesive layer comprises the following components in parts by weight: 70-90 parts of acrylate polymer, 1-5 parts of polydopamine coated conductive filler with sulfydryl on the surface, 1-2 parts of curing agent and 10-30 parts of solvent.
2. The carbon-coated aluminum foil conductive tape for the lithium battery as claimed in claim 1, wherein the conductive filler in the polydopamine-coated conductive filler with a surface containing a mercapto group is one or a mixture of two or more of carbon nanotubes, graphene, carbon black and conductive glass fibers.
3. The carbon-coated aluminum foil conductive adhesive tape for the lithium battery as claimed in claim 1 or 2, wherein the preparation process of the poly-dopamine coated conductive filler containing sulfydryl on the surface comprises the following steps: ultrasonically dispersing a conductive filler in an aqueous solution, adding dopamine hydrochloride under the stirring condition, stirring for reaction for 10-20min, adding a Tris buffer solution to adjust the pH value to 8-9, and continuing to react for 15-20h to obtain a polydopamine coated conductive filler; and ultrasonically dispersing the polydopamine-coated conductive filler in a Tris buffer solution, adding mercaptopropionic acid, and stirring for reacting for 1-2h to obtain the polydopamine-coated conductive filler with the surface containing sulfydryl.
4. The carbon-coated aluminum foil conductive tape for a lithium battery as claimed in claim 3, wherein the weight ratio of the conductive filler to the dopamine hydrochloride is 1-2: 1; the weight ratio of the polydopamine-coated conductive filler to the mercaptopropionic acid is 1-1.5: 1.
5. the carbon-coated aluminum foil conductive tape for a lithium battery as claimed in any one of claims 1 to 4, wherein the curing agent is one of isocyanate, imidazole, triethylamine, and 2-ethyl-4-methylimidazole.
6. The carbon-coated aluminum foil conductive tape for a lithium battery as claimed in any one of claims 1 to 5, wherein the solvent is ethyl acetate or toluene; preferably, the solvent is ethyl acetate.
7. A method for preparing the carbon-coated aluminum foil conductive tape for the lithium battery as set forth in any one of claims 1 to 6, comprising the steps of: uniformly mixing an acrylate polymer, a polydopamine coated conductive filler with a sulfydryl surface, a curing agent and a solvent according to a weight ratio to obtain an adhesive; and coating the adhesive on the surface of the aluminum foil substrate, and curing to obtain the carbon-coated aluminum foil conductive adhesive tape for the lithium battery.
8. The method for preparing the carbon-coated aluminum foil conductive tape for the lithium battery as claimed in claim 7, wherein the curing temperature is 70 to 90 ℃ and the curing time is 5 to 10 min.
9. The method for preparing the carbon-coated aluminum foil conductive tape for the lithium battery as claimed in claim 7 or 8, wherein the adhesive is coated to a thickness of 10 to 30 μm.
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|---|---|---|---|
| CN202010380598.7A CN111534243A (en) | 2020-05-08 | 2020-05-08 | Carbon-coated aluminum foil conductive adhesive tape for lithium battery and preparation method thereof |
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| CN202010380598.7A CN111534243A (en) | 2020-05-08 | 2020-05-08 | Carbon-coated aluminum foil conductive adhesive tape for lithium battery and preparation method thereof |
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| CN115386317A (en) * | 2022-08-16 | 2022-11-25 | 浙江工业大学 | Preparation method of high-thermal-conductivity and high-electrical-conductivity composite adhesive taking graphene and carbon nano tubes as fillers |
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