CN110649220A - Surface carbon coating method for lithium battery aluminum foil - Google Patents
Surface carbon coating method for lithium battery aluminum foil Download PDFInfo
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- CN110649220A CN110649220A CN201910826574.7A CN201910826574A CN110649220A CN 110649220 A CN110649220 A CN 110649220A CN 201910826574 A CN201910826574 A CN 201910826574A CN 110649220 A CN110649220 A CN 110649220A
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- Prior art keywords
- aluminum foil
- solution
- later use
- carbon coating
- soaking
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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
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/04—Processes of manufacture in general
- H01M4/0402—Methods of deposition of the material
- H01M4/0421—Methods of deposition of the material involving vapour deposition
- H01M4/0423—Physical vapour deposition
- H01M4/0426—Sputtering
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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
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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
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/04—Processes of manufacture in general
- H01M4/0402—Methods of deposition of the material
- H01M4/0421—Methods of deposition of the material involving vapour deposition
- H01M4/0428—Chemical vapour deposition
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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
- 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
- H01M4/662—Alloys
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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
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/64—Carriers or collectors
- H01M4/66—Selection of materials
- H01M4/663—Selection of materials containing carbon or carbonaceous materials as conductive part, e.g. graphite, carbon fibres
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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
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/64—Carriers or collectors
- H01M4/66—Selection of materials
- H01M4/665—Composites
- H01M4/667—Composites in the form of layers, e.g. coatings
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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
Abstract
The invention discloses a surface carbon coating method of a lithium battery aluminum foil, belonging to the technical field of lithium battery aluminum foil processing, comprising the following steps: s1, selecting a solution: selecting a weak alkaline solution with a certain concentration for later use; s2, soaking: putting the aluminum foil into a weak alkaline solution, and soaking for later use; s3, air drying: taking out the soaked aluminum foil, and air-drying the aluminum foil by using an industrial air cooler for later use; s4, carbon coating: in a specific environment, the surface of the aluminum foil is connected with the conductive layer, so that the conductive capacity is improved, the interface resistance is reduced, the low-temperature discharge capacity of the battery is improved, the cycle life is prolonged, and the process is scientific and reasonable.
Description
Technical Field
The invention relates to the technical field of lithium battery aluminum foil processing, in particular to a method for coating carbon on the surface of a lithium battery aluminum foil.
Background
The Battery aluminum foil (Battery aluminum foil) is used as a current collector of a lithium ion Battery, generally, the lithium ion Battery industry uses rolled aluminum foil hot rolling as a positive electrode of a negative electrode current collector, the thickness of the rolled foil is different from 10 to 50 micrometers, and common pure aluminum foils of lithium batteries have various alloy designations such as 1060, 1050, 1145 and 1235, and have the states of-O, H14, -H24, -H22 and-H18.
The carbon coating treatment needs to be carried out on the lithium battery aluminum foil in the processing process of the lithium battery aluminum foil, but the existing carbon coating method is convenient, but effective treatment on an oxide layer and oil stains on the surface of the lithium battery is neglected, so that the carbon coating is directly carried out, the conductive capacity is poor, the interface resistance cannot be reduced, the low-temperature discharge capacity of the battery is reduced, the cycle life is shortened, and meanwhile, the carbon coating method is not reasonable, so that the result is unsatisfactory.
Disclosure of Invention
1. Technical problem to be solved
Aiming at the problems in the prior art, the invention aims to provide a method for coating carbon on the surface of an aluminum foil of a lithium battery, which improves the conductivity, reduces the interface resistance, improves the low-temperature discharge capacity of the battery, prolongs the cycle life and has scientific and reasonable working procedures.
2. Technical scheme
In order to solve the problems, the invention adopts the following technical scheme:
a surface carbon coating method for an aluminum foil of a lithium battery comprises the following steps:
s1, selecting a solution: selecting a weak alkaline solution with a certain concentration for later use;
s2, soaking: putting the aluminum foil into a weak alkaline solution, and soaking for later use;
s3, air drying: taking out the soaked aluminum foil, and air-drying the aluminum foil by using an industrial air cooler for later use;
s4, carbon coating: and under a specific environment, connecting a conductive layer on the surface of the aluminum foil.
As a preferred embodiment of the present invention, in step S1, the weak alkaline solution includes but is not limited to Ca (OH)2Solution, Na (OH)2And (3) solution.
As a preferred embodiment of the present invention, the Ca (OH)2The concentration of the solution is 10-15%, the Na (OH)2The concentration of the solution is 10-15%.
As a preferable embodiment of the present invention, in step S2, the soaking time is 45-60 min.
In a preferred embodiment of the present invention, in step S3, the air drying time is 20-30 min.
As a preferable aspect of the present invention, in step S4, the specific atmosphere is in vacuum or in an inert gas.
As a preferred embodiment of the present invention, the inert gas includes, but is not limited to, helium, neon, and argon.
As a preferable aspect of the present invention, in step S4, the conductive layer is provided as a layer, and the connection manner of the conductive layer is sputtering or chemical deposition.
As a preferred aspect of the present invention, in step S4, the conductive layer may be made of materials including, but not limited to, carbon nanotubes, graphene, and carbon black.
3. Advantageous effects
Compared with the prior art, the invention has the advantages that:
(1) the invention firstly adopts alkaline solution to soak the aluminum foil to remove the oxide layer and oil stain on the surface.
(2) The invention has good effect by sputtering or chemically depositing a conducting layer on the surface of the aluminum foil in vacuum or inert gases such as helium, neon, argon and the like.
(3) After the aluminum foil is coated with the carbon coating layer, the conductivity is improved, the interface resistance is reduced, the low-temperature discharge capacity of the battery is improved, and the cycle life is prolonged.
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. It is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments, and all other embodiments obtained by those skilled in the art without any inventive work are within the scope of the present invention.
Example 1:
a surface carbon coating method for an aluminum foil of a lithium battery comprises the following steps:
s1, selecting 10% Ca (OH)2Solution for later use;
s2, soaking: placing aluminum foil into Ca(OH)2Soaking the solution for 60 min;
s3, air drying: taking out the soaked aluminum foil, and air-drying the aluminum foil by using an industrial air cooler for 30min for later use;
s4, carbon coating: and sputtering or chemically depositing a conductive layer on the surface of the aluminum foil in vacuum or inert gas such as helium, neon, argon and the like, wherein the conductive layer is made of selected materials including but not limited to carbon nanotubes, graphene and carbon black.
Example 2:
a surface carbon coating method for an aluminum foil of a lithium battery comprises the following steps:
s1, selecting Ca (OH) with the concentration of 12 percent2Solution for later use;
s2, soaking: placing the aluminum foil in Ca (OH)2Soaking the solution for 52 min;
s3, air drying: taking out the soaked aluminum foil, and air-drying the aluminum foil by using an industrial air cooler for 25min for later use;
s4, carbon coating: and sputtering or chemically depositing a conductive layer on the surface of the aluminum foil in vacuum or inert gas such as helium, neon, argon and the like, wherein the conductive layer is made of selected materials including but not limited to carbon nanotubes, graphene and carbon black.
Example 3:
a surface carbon coating method for an aluminum foil of a lithium battery comprises the following steps:
s1, selecting 10% Ca (OH)2Solution for later use;
s2, soaking: placing the aluminum foil in Ca (OH)2Soaking the solution for 45min for later use;
s3, air drying: taking out the soaked aluminum foil, and air-drying the aluminum foil by using an industrial air cooler for 20min for later use;
s4, carbon coating: and sputtering or chemically depositing a conductive layer on the surface of the aluminum foil in vacuum or inert gas such as helium, neon, argon and the like, wherein the conductive layer is made of selected materials including but not limited to carbon nanotubes, graphene and carbon black.
Example 4:
a surface carbon coating method for an aluminum foil of a lithium battery comprises the following steps:
s1, selecting 10% Na (OH)2Solution for later use;
s2, soaking: placing the aluminum foil in Na (OH)2Soaking the solution for 60 min;
s3, air drying: taking out the soaked aluminum foil, and air-drying the aluminum foil by using an industrial air cooler for 30min for later use;
s4, carbon coating: and sputtering or chemically depositing a conductive layer on the surface of the aluminum foil in vacuum or inert gas such as helium, neon, argon and the like, wherein the conductive layer is made of selected materials including but not limited to carbon nanotubes, graphene and carbon black.
Example 5:
a surface carbon coating method for an aluminum foil of a lithium battery comprises the following steps:
s1, selecting 12% Na (OH)2Solution for later use;
s2, soaking: placing the aluminum foil in Na (OH)2Soaking the solution for 52 min;
s3, air drying: taking out the soaked aluminum foil, and air-drying the aluminum foil by using an industrial air cooler for 25min for later use;
s4, carbon coating: and sputtering or chemically depositing a conductive layer on the surface of the aluminum foil in vacuum or inert gas such as helium, neon, argon and the like, wherein the conductive layer is made of selected materials including but not limited to carbon nanotubes, graphene and carbon black.
Example 6:
a surface carbon coating method for an aluminum foil of a lithium battery comprises the following steps:
s1, selecting 10% Na (OH)2Solution for later use;
s2, soaking: placing the aluminum foil in Na (OH)2Soaking the solution for 45min for later use;
s3, air drying: taking out the soaked aluminum foil, and air-drying the aluminum foil by using an industrial air cooler for 20min for later use;
s4, carbon coating: and sputtering or chemically depositing a conductive layer on the surface of the aluminum foil in vacuum or inert gas such as helium, neon, argon and the like, wherein the conductive layer is made of selected materials including but not limited to carbon nanotubes, graphene and carbon black.
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 equivalent replacement or change according to the technical solution and the modified concept of the present invention should be covered by the scope of the present invention.
Claims (9)
1. The surface carbon coating method of the lithium battery aluminum foil is characterized by comprising the following steps of:
s1, selecting a solution: selecting a weak alkaline solution with a certain concentration for later use;
s2, soaking: putting the aluminum foil into a weak alkaline solution, and soaking for later use;
s3, air drying: taking out the soaked aluminum foil, and air-drying the aluminum foil by using an industrial air cooler for later use;
s4, carbon coating: and under a specific environment, connecting a conductive layer on the surface of the aluminum foil.
2. The method as claimed in claim 1, wherein the weak alkaline solution includes but is not limited to Ca (OH) in step S12Solution, Na (OH)2And (3) solution.
3. The method as claimed in claim 2, wherein the Ca (OH) is added with carbon on the surface of the aluminum foil2The concentration of the solution is 10-15%, the Na (OH)2The concentration of the solution is 10-15%.
4. The method as claimed in claim 1, wherein the soaking time in step 2 is 45-60 min.
5. The method as claimed in claim 1, wherein the air drying time is 20-30min in step S3.
6. The method as claimed in claim 1, wherein the specific atmosphere is vacuum or inert gas in step S4.
7. The method as claimed in claim 6, wherein the inert gas includes but is not limited to helium, neon, and argon.
8. The method as claimed in claim 1, wherein the conductive layer is formed as a layer and the conductive layer is connected by sputtering or chemical deposition in step S4.
9. The method as claimed in claim 1, wherein in step S4, the conductive layer is made of materials selected from carbon nanotubes, graphene, and carbon black.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910826574.7A CN110649220A (en) | 2019-09-03 | 2019-09-03 | Surface carbon coating method for lithium battery aluminum foil |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910826574.7A CN110649220A (en) | 2019-09-03 | 2019-09-03 | Surface carbon coating method for lithium battery aluminum foil |
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| CN110649220A true CN110649220A (en) | 2020-01-03 |
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| CN201910826574.7A Pending CN110649220A (en) | 2019-09-03 | 2019-09-03 | Surface carbon coating method for lithium battery aluminum foil |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114744207A (en) * | 2022-03-29 | 2022-07-12 | 佛山市中技烯米新材料有限公司 | Lithium supplement current collector and lithium supplement electrode |
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Application publication date: 20200103 |
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