CN115810761A - Strong corrosion-resistant carbon-coated aluminum foil for lithium ion battery and preparation method and application thereof - Google Patents
Strong corrosion-resistant carbon-coated aluminum foil for lithium ion battery and preparation method and application thereof Download PDFInfo
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Abstract
The invention discloses a strong corrosion-resistant carbon-coated aluminum foil for a lithium ion battery and a preparation method thereof, wherein conductive slurry comprises a conductive agent, hydrofluoric acid and an oligomeric hydrocarbon solution; the mass percentage of the conductive agent in the conductive paste is 3-8%; the mass proportion of the hydrofluoric acid in the conductive paste is 4-15%; the concentration of the oligomeric hydrocarbon-oxygen compound solution is 1.0-1.3g/ml, and the mass ratio of the oligomeric hydrocarbon-oxygen compound solution to the conductive agent is (1-15): 1. after the pole piece is treated by the conductive slurry, the bonding force of the pole piece can be effectively and obviously improved, the conductive performance is ensured, the corrosion of electrolyte to an aluminum foil can be effectively prevented, and the electrolyte corrosion resistance of the pole piece is obviously improved; the effect of improving the cycle performance of the prepared battery is effectively achieved.
Description
Technical Field
The invention relates to the field of lithium ion batteries, in particular to a strong corrosion-resistant carbon-coated aluminum foil for a lithium ion battery, and a preparation method and application thereof.
Background
Compared with the mainstream chemical battery, the lithium ion battery has the advantages of high energy density, wide voltage window, long service life and the like, and is widely used in the fields of high-value-added consumer electronics and power batteries. However, the lithium battery has the problems of poor conductivity, low rate performance and poor heat dissipation performance, and the application of the lithium battery is greatly limited. The current collector plays an important role in lithium ion batteries, and not only is a carrier of active materials, but also plays a role in collecting and outputting current generated by the active materials of the batteries. Therefore, the current collector should be in sufficient contact with the active material, and the smaller the internal resistance should be, the better. The conductive carbon layer coated on the surface of the aluminum foil can inhibit battery polarization, reduce internal resistance, reduce heat effect, improve battery multiplying power performance, improve adhesion of active substances and the aluminum foil, and reduce the dosage of a binder.
At present, the method for coating the conductive carbon layer on the surface of the foil in the industry mainly comprises the following steps: (1) The vapor deposition of the conductive carbon is carried out on the aluminum foil, so that the equipment cost is higher; (2) Coating the mixed carbon powder on an aluminum foil at high temperature, and then raising the temperature for heat treatment to prepare the carbon-coated aluminum foil, wherein the foil coating prepared by the method is easy to peel off; (3) The modification is performed by coating a slurry containing a binder and a conductive agent.
In the method (3) for coating the conductive carbon layer on the foil surface, when the modification is performed by coating the slurry containing the binder and the conductive agent, although the adhesive force between the conductive carbon layer and the foil can be effectively increased, the problem of isolating the conductive contact between the positive active material and the aluminum foil can be caused, and the electrical property of the prepared battery is further reduced; moreover, because of the corrosion of acidic substances in the electrolyte to the current collector, the prior disclosed conductive carbon layer has no isolation effect on the current collector, and the improvement on the cycle performance of the battery is very limited.
Disclosure of Invention
Therefore, the invention aims to solve the problems of insufficient binding power between a conductive carbon layer and a foil and isolation of conductive contact between a positive electrode active substance and an aluminum foil in the prior art, and provides a strong corrosion-resistant carbon-coated aluminum foil for a lithium ion battery, which has good conductivity and binding property, and a preparation method and application thereof.
A conductive paste includes a conductive agent, hydrofluoric acid, and an oligomeric hydrocarbon compound solution; the mass percentage of the conductive agent in the conductive slurry is 3-8%; the mass proportion of the hydrofluoric acid in the conductive paste is 4-15%; the concentration of the oligomeric hydrocarbon compound solution is 1.0-1.3g/ml, and the mass ratio of the oligomeric hydrocarbon compound solution to the conductive agent is (1-15): 1.
for example: the mass percentage of the conductive agent in the conductive paste can be 3%, 4%, 5%, 6%, 7% and 8%; the mass ratio of hydrofluoric acid in the conductive paste can be 4%, 5%, 6%, 7%, 8%, 9%, 10%, 11%, 12%, 13%, 14% and 15%; the mass ratio of the oligomeric hydrocarbon-oxygen compound solution to the conductive agent may be 1: 1. 2: 1. 3: 1. 4: 1.5: 1. 6: 1.7: 1. 8: 1. 9: 1. 10: 1. 11: 1. 12: 1. 13: 1. 14: 1. 15:1.
the conductive agent is at least one of conductive carbon black, carbon nano tubes, acetylene black and graphene.
The solvent is at least one of water, ethanol and methanol.
The oligomeric carbon-oxygen compound is at least one of glucose, fructose, xylose and sucrose.
A method of making a carbon-coated foil, comprising: and (3) obtaining the conductive slurry, coating the conductive slurry on the surface of the foil, and drying, sintering and rolling the coated foil to obtain the carbon-coated foil.
The thickness of the conductive slurry coated on the surface of the foil is 1-3 μm;
and/or in the drying step, the drying temperature is less than or equal to 50 ℃;
and/or in the sintering step, sintering is carried out for 2h at 350-450 ℃ in an inert atmosphere;
and/or in the rolling step, the thickness after rolling is 30-60% of the initial thickness;
and/or the foil is an aluminum foil.
The inert atmosphere is nitrogen.
The carbon-coated foil is prepared by the preparation method.
A strong corrosion-resistant lithium ion battery comprises the carbon-coated foil.
The carbon-coated foil is applied to the lithium ion battery with strong corrosion resistance.
The technical scheme of the invention has the following advantages:
1. the invention discloses conductive paste which comprises a conductive agent, an oligomeric hydrocarbon-oxygen compound solution and hydrofluoric acid; the mass percentage of the conductive agent in the conductive paste is 3-8%; the mass proportion of the hydrofluoric acid in the conductive paste is 4-15%; the concentration of the oligomeric hydrocarbon-oxygen compound solution is 1.0-1.3g/ml, and the mass ratio of the oligomeric hydrocarbon-oxygen compound solution to the conductive agent is (1-15): 1. when the conductive paste is applied to the foil to prepare the carbon-coated foil, hydrofluoric acid in the conductive paste can slightly etch the foil, and a rough surface is formed on the surface of the foil so as to improve the bonding force between the carbon-coated layer and the aluminum foil; meanwhile, HF reacts with a conductive agent and an oligomeric hydrocarbon-oxygen compound to generate various surface groups, a carbon layer with hydroxyl, carboxyl and fluorine-containing groups is formed after the conductive slurry is coated and subjected to subsequent carbonization, and the groups in the carbon layer can form good compatibility with the anode slurry, so that the binding force between the coated carbon layer and the anode material is improved, the conductive contact effect is ensured, and good conductive performance is obtained; moreover, the introduction of the oligomeric hydrocarbon-oxygen compound can enable the conductive agent to be more uniformly coated on the surface of the foil, and the adhesion between the coated carbon layer and the foil can be obviously improved after carbonization;
in addition, the low-polymer carbon hydroxide compound is cheap, non-toxic and renewable, and the carbonization temperature is relatively low, so that the production process cost can be reduced while the binding power is improved and the compatibility is improved by reaction with hydrofluoric acid.
2. The invention discloses a preparation method of a carbon-coated foil, the foil is preferably an aluminum foil, and at the moment, when the conductive slurry is coated on the aluminum foil, HF (high frequency) can generate aluminum fluoride and other fluoride-containing compounds after etching the aluminum foil, so that a compact conductive protective layer is formed, the foil is prevented from being corroded by electrolyte, and the corrosion resistance is improved; the effect of improving the cycle performance of the prepared battery is effectively achieved.
Detailed Description
The following examples are provided to further understand the present invention, not to limit the scope of the present invention, but to provide the best mode, not to limit the content and the protection scope of the present invention, and any product similar or similar to the present invention, which is obtained by combining the present invention with other prior art features, falls within the protection scope of the present invention.
The examples do not show the specific experimental steps or conditions, and can be performed according to the conventional experimental steps described in the literature in the field.
Example 1
A preparation method of a carbon-coated foil comprises the following specific steps:
preparing conductive slurry: adding 12.5g of glucose into a proper amount of water to dissolve and fix the volume to 10ml, and preparing a glucose solution with the concentration of 1.25 g/ml; adding 15g of HF aqueous solution with the mass concentration of 40wt% and 30g of SP dispersion liquid (the mass fraction is 10%, the dispersion solvent is water) into 24g of glucose solution, and uniformly stirring to obtain conductive slurry, wherein the mass fraction of HF in the conductive slurry is 8.7%, the mass fraction of SP in the conductive slurry is 4.3%, and the mass ratio of the glucose solution to the conductive agent is 8:1;
preparing a carbon-coated aluminum foil: coating the slurry on the surface of an aluminum foil by using a scraper, and drying in an oven, wherein the coating thickness in the embodiment is 2 mu m, and the drying temperature is 40 ℃; and after drying, placing the aluminum foil in a tube furnace, introducing nitrogen for protection, heating to 400 ℃ for 2 hours, and rolling the obtained foil to obtain a coating layer with the thickness of 50% of the initial thickness.
Example 2
A preparation method of a carbon-coated foil comprises the following specific steps:
preparing conductive slurry: adding 10g of glucose into a proper amount of water to be dissolved and fixing the volume to 10ml, and preparing a glucose solution with the concentration of 1 g/ml; 15g of an aqueous solution of HF with a mass concentration of 40wt% and 50g of a dispersion liquid of SP (the mass fraction is 10%, the dispersion solvent is methanol) were added to 64g of a glucose solution and stirred uniformly to obtain a conductive slurry, the mass fraction of HF in the conductive slurry was 4.7%, the mass fraction of SP was 3.9%, and the mass ratio of the glucose solution to the conductive agent was 12.8:1;
preparing a carbon-coated aluminum foil: coating the slurry on the surface of an aluminum foil by using a scraper, and drying in an oven, wherein the coating thickness in the embodiment is 2 mu m, and the drying temperature is 40 ℃; and after drying, placing the aluminum foil in a tube furnace, introducing nitrogen for protection, heating to 400 ℃ for 2 hours, and rolling the obtained foil to obtain a coating layer with the thickness of 50% of the initial thickness.
Example 3
A preparation method of a carbon-coated foil comprises the following specific steps:
preparing conductive slurry: adding 11g of glucose into a proper amount of water to dissolve and fix the volume to 10ml, and preparing a glucose solution with the concentration of 1.1 g/ml; adding 15g of an HF aqueous solution with the mass concentration of 40wt% and 66g of an SP dispersion liquid (the mass fraction is 10%, the dispersion solvent is ethanol) into 11g of a glucose solution, and uniformly stirring to obtain a conductive slurry, wherein the mass fraction of HF in the conductive slurry is 6.5%, the mass fraction of SP in the conductive slurry is 7.2%, and the mass ratio of the glucose solution to a conductive agent is 1.7:1;
preparing a carbon-coated aluminum foil: coating the slurry on the surface of an aluminum foil by using a scraper, and drying in an oven, wherein the coating thickness in the embodiment is 2 mu m, and the drying temperature is 40 ℃; and after drying, placing the aluminum foil in a tube furnace, introducing nitrogen for protection, heating to 400 ℃ and keeping for 2 hours, and rolling the obtained foil to obtain a coating layer with the thickness of 50% of the initial thickness.
Example 4
A preparation method of a carbon-coated foil comprises the following specific steps:
preparing conductive slurry: adding 12g of glucose into a proper amount of water to be dissolved and fixing the volume to 10ml, and preparing a glucose solution with the concentration of 1.2 g/ml; 15g of an HF aqueous solution with a mass concentration of 40wt% and 20g of an SP dispersion (the mass fraction is 10%, the dispersion solvent is water) are added into 14g of a glucose solution and stirred uniformly to obtain a conductive slurry, wherein the mass fraction of HF in the conductive slurry is 12.2%, the mass fraction of SP in the conductive slurry is 4.1%, and the mass ratio of the glucose solution to the conductive agent is 7:1;
preparing a carbon-coated aluminum foil: coating the slurry on the surface of an aluminum foil by using a scraper, and drying in an oven, wherein the coating thickness in the embodiment is 2 mu m, and the drying temperature is 40 ℃; and after drying, placing the aluminum foil in a tube furnace, introducing nitrogen for protection, heating to 400 ℃ for 2 hours, and rolling the obtained foil to obtain a coating layer with the thickness of 50% of the initial thickness.
Example 5
A preparation method of a carbon-coated foil comprises the following specific steps:
preparing conductive slurry: adding 13g of glucose into a proper amount of water to dissolve and fix the volume to 10ml, and preparing a glucose solution with the concentration of 1.3 g/ml; adding 15g of HF aqueous solution with the mass concentration of 40wt% and 37g of SP dispersion liquid (the mass fraction is 10%, the dispersion solvent is water) into 20g of glucose solution, and uniformly stirring to obtain conductive slurry, wherein the mass fraction of HF in the conductive slurry is 8.3%, the mass fraction of SP in the conductive slurry is 5.1%, and the mass ratio of the glucose solution to the conductive agent is 5.4:1;
preparing a carbon-coated aluminum foil: coating the slurry on the surface of an aluminum foil by using a scraper, and drying in an oven, wherein the coating thickness in the embodiment is 2 mu m, and the drying temperature is 40 ℃; and after drying, placing the aluminum foil in a tube furnace, introducing nitrogen for protection, heating to 400 ℃, keeping for 2h, and rolling the obtained foil to obtain a coating layer with the thickness of 50% of the initial thickness.
Example 6
A preparation method of a carbon-coated foil comprises the following specific steps:
preparing conductive slurry: adding 12g of glucose into a proper amount of water to be dissolved and fixing the volume to 10ml, and preparing a glucose solution with the concentration of 1.2 g/ml; adding 15g of an HF aqueous solution with the mass concentration of 40wt% and 55g of an SP dispersion liquid (the mass fraction is 10%, the dispersion solvent is water) into 16g of a glucose solution, and uniformly stirring to obtain a conductive slurry, wherein the mass fraction of HF in the conductive slurry is 7.0%, the mass fraction of SP in the conductive slurry is 6.4%, and the mass ratio of the glucose solution to a conductive agent is 2.9:1;
preparing a carbon-coated aluminum foil: coating the slurry on the surface of an aluminum foil by using a scraper, and drying in an oven, wherein the coating thickness in the embodiment is 2 mu m, and the drying temperature is 40 ℃; and after drying, placing the aluminum foil in a tube furnace, introducing nitrogen for protection, heating to 400 ℃, keeping for 2h, and rolling the obtained foil to obtain a coating layer with the thickness of 50% of the initial thickness.
Example 7
A preparation method of a carbon-coated foil comprises the following specific steps:
preparing conductive slurry: adding 12.5g of glucose into a proper amount of water to be dissolved and fixing the volume to 10ml, and preparing a glucose solution with the concentration of 1.25 g/ml; adding 15g of HF aqueous solution with the mass concentration of 40wt% and 30g of SP dispersion liquid (the mass fraction is 10%, the dispersion solvent is water) into 24g of glucose solution, and uniformly stirring to obtain conductive slurry, wherein the mass fraction of HF in the conductive slurry is 8.7%, the mass fraction of SP in the conductive slurry is 4.3%, and the mass ratio of the glucose solution to the conductive agent is 8:1;
preparing a carbon-coated aluminum foil: coating the slurry on the surface of an aluminum foil by using a scraper, and drying in an oven, wherein the coating thickness is 1 mu m in the embodiment, and the drying temperature is 50 ℃; and after drying, placing the aluminum foil in a tube furnace, introducing nitrogen for protection, heating to 350 ℃, keeping for 2 hours, and rolling the obtained foil to obtain a coating layer with the thickness of 60% of the initial thickness.
Example 8
A preparation method of a carbon-coated foil comprises the following specific steps:
preparing conductive slurry: adding 12.5g of glucose into a proper amount of water to dissolve and fix the volume to 10ml, and preparing a glucose solution with the concentration of 1.25 g/ml; adding 15g of HF aqueous solution with the mass concentration of 40wt% and 30g of SP dispersion liquid (the mass fraction is 10%, the dispersion solvent is water) into 24g of glucose solution, and uniformly stirring to obtain conductive slurry, wherein the mass fraction of HF in the conductive slurry is 8.7%, the mass fraction of SP in the conductive slurry is 4.3%, and the mass ratio of the glucose solution to the conductive agent is 8:1;
preparing a carbon-coated aluminum foil: coating the slurry on the surface of an aluminum foil by using a scraper, and drying in an oven, wherein the coating thickness is 3 mu m in the embodiment, and the drying temperature is 45 ℃; and after drying, placing the aluminum foil in a tube furnace, introducing nitrogen for protection, heating to 450 ℃, keeping for 2 hours, and rolling the obtained foil, wherein the thickness of the coating layer after rolling is 30% of the initial thickness.
Example 9
A preparation method of a carbon-coated foil comprises the following specific steps:
preparing conductive slurry: adding 12.5g of sucrose into a proper amount of water to dissolve, and fixing the volume to 10ml to prepare a sucrose solution with the concentration of 1.25 g/ml; adding 15g of HF aqueous solution with the mass concentration of 40wt% and 30g of carbon nano tube dispersion liquid (the mass fraction is 10%, the dispersion solvent is water) into 24g of sucrose solution, and uniformly stirring to obtain conductive slurry, wherein the mass fraction of HF in the conductive slurry is 8.7%, the mass fraction of carbon nano tubes in the conductive slurry is 4.3%, and the mass ratio of the sucrose solution to the conductive agent is 8:1;
preparing a carbon-coated aluminum foil: coating the slurry on the surface of an aluminum foil by using a scraper, and drying in an oven, wherein the coating thickness in the embodiment is 2 mu m, and the drying temperature is 40 ℃; and after drying, placing the aluminum foil in a tube furnace, introducing nitrogen for protection, heating to 400 ℃, keeping for 2h, and rolling the obtained foil to obtain a coating layer with the thickness of 50% of the initial thickness.
Example 10
A preparation method of a carbon-coated foil comprises the following specific steps:
preparing conductive slurry: adding 12.5g of xylose into a proper amount of water to dissolve, and fixing the volume to 10ml to prepare a xylose solution with the concentration of 1.25 g/ml; adding 15g of HF aqueous solution with the mass concentration of 40wt% and 30g of graphene dispersion liquid (the mass fraction is 10%, and the dispersion solvent is water) into 24g of xylose solution, and uniformly stirring to obtain conductive slurry, wherein the mass fraction of HF in the conductive slurry is 8.7%, the mass fraction of graphene in the conductive slurry is 4.3%, and the mass ratio of the xylose solution to the conductive agent is 8:1;
preparing a carbon-coated aluminum foil: coating the slurry on the surface of an aluminum foil by using a scraper, and drying in an oven, wherein the coating thickness in the embodiment is 2 microns, and the drying temperature is 40 ℃; and after drying, placing the aluminum foil in a tube furnace, introducing nitrogen for protection, heating to 400 ℃, keeping for 2h, and rolling the obtained foil to obtain a coating layer with the thickness of 50% of the initial thickness.
Example 11
A preparation method of a carbon-coated foil comprises the following specific steps:
preparing conductive slurry: adding 12.5g of fructose into a proper amount of water to dissolve and fix the volume to 10ml, and preparing a fructose solution with the concentration of 1.25 g/ml; adding 15g of HF aqueous solution with the mass concentration of 40wt% and 30g of acetylene black dispersion liquid (the mass fraction is 10%, the dispersion solvent is water) into 24g of fructose solution, and uniformly stirring to obtain conductive slurry, wherein the mass fraction of HF in the conductive slurry is 8.7%, the mass fraction of acetylene black is 4.3%, and the mass ratio of the fructose solution to the conductive agent is 8:1;
preparing a carbon-coated aluminum foil: coating the slurry on the surface of an aluminum foil by using a scraper, and drying in an oven, wherein the coating thickness in the embodiment is 2 mu m, and the drying temperature is 40 ℃; and after drying, placing the aluminum foil in a tube furnace, introducing nitrogen for protection, heating to 400 ℃, keeping for 2h, and rolling the obtained foil to obtain a coating layer with the thickness of 50% of the initial thickness.
Comparative example 1
Preparing conductive slurry: adding 12.5g of glucose into a proper amount of water to dissolve and fix the volume to 10ml, and preparing a glucose solution with the concentration of 1.25 g/ml; 15g of water and 30g of SP dispersion (the mass fraction is 10%, and the dispersion solvent is water) were added to 24g of glucose solution and stirred uniformly to obtain a conductive paste.
A carbon-coated aluminum foil was prepared using the process conditions in example 1.
Test example 1
The positive pole piece is prepared by adopting the carbon-coated aluminum foil prepared by the embodiment and the comparative example, and the preparation process of the pole piece is as follows: with LiNi 0.5 Mn 1.5 O 4 Spinel is used as a main material of the anode, and the main material of the anode, a solvent (NMP) and a binder (PVDF) are mixed according to LiNi 0.5 Mn 1.5 O 4 : PVDF: SP =96.5:1.5:2.0 mass ratio, by adjusting the amount of NMPAnd regulating the viscosity of the slurry to ensure that the viscosity is 5000 +/-1000 mPas. And selecting the prepared carbon-coated aluminum foil as a current collector, and performing procedures of homogenate coating, drying at 110 ℃, rolling and the like to obtain a positive pole piece with the thickness of 65 +/-3 mu m.
The pole piece adhesion (mN/mm), the pole piece electrolyte corrosion resistance and the pole piece impedance (omega) were measured according to the measurement method disclosed in CN110676462A, and the measurement results are shown in Table 1.
TABLE 1
The above comparative example 2 is a positive electrode sheet obtained by directly coating the positive electrode slurry with an aluminum foil.
According to the detection results, the surface conditions of the aluminum foil, the SP and the hydrocarbon polymer are effectively improved by treating the aluminum foil, the SP and the hydrocarbon polymer with HF, and the adhesion of the pole piece is effectively and remarkably improved; but also can effectively prevent the electrolyte from corroding the aluminum foil, and obviously improve the electrolyte corrosion resistance of the pole piece.
Test example 2
The positive pole piece prepared in the experimental example 1 is used for preparing the soft package battery, and the manufacturing process of the soft package battery is as follows:
the negative pole piece adopts a G49 graphite negative pole; the diaphragm is a ceramic modified diaphragm taking PE as a base film; mixing ethylene carbonate, ethyl methyl carbonate and diethyl carbonate according to a volume ratio of 5:3:2 mixing and drying thoroughly LiPF 6 Dissolving in the mixed organic solvent to obtain the required electrolyte. The rated capacity of the soft package battery is 10Ah.
The performance of the prepared soft package battery is detected according to the current national standard and the conventional method in China, and the detection results are shown in the following table 2:
TABLE 2
According to the detection results, the carbon-coated aluminum foil prepared by the invention can effectively improve the cycle performance of the soft package battery under the condition of ensuring the performance of the first discharge capacity (mAh/g) and the first coulombic efficiency (%).
It should be understood that the above examples are only for clarity of illustration and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. This need not be, nor should it be exhaustive of all embodiments. And obvious variations or modifications therefrom are within the scope of the invention.
Claims (10)
1. A conductive paste, characterized by comprising a conductive agent, hydrofluoric acid and an oligomeric hydrocarbon compound solution; the mass percentage of the conductive agent in the conductive paste is 3-8%; the mass ratio of the hydrofluoric acid in the conductive slurry is 4-15%; the concentration of the oligomeric hydrocarbon compound solution is 1.0-1.3g/ml, and the mass ratio of the oligomeric hydrocarbon compound solution to the conductive agent is (1-15): 1.
2. the conductive paste according to claim 1, wherein the conductive agent is at least one of conductive carbon black, carbon nanotubes, acetylene black and graphene.
3. The conductive paste according to claim 1 or 2, wherein said solvent is at least one of water, ethanol and methanol.
4. The electroconductive paste according to any one of claims 1 to 3, wherein said oligomeric carbohydrate is at least one of glucose, fructose, xylose and sucrose.
5. A method for preparing a carbon-coated foil is characterized by comprising the following steps: obtaining the conductive paste of any one of claims 1-4, coating the conductive paste on the surface of a foil, and drying, sintering and rolling the coated foil to obtain the carbon-coated foil.
6. The method according to claim 5, wherein the conductive paste is coated on the surface of the foil to a thickness of 1-3 μm;
and/or in the drying step, the drying temperature is less than or equal to 50 ℃;
and/or, in the sintering step, sintering for 2h at 350-450 ℃ in an inert atmosphere;
and/or in the rolling step, the thickness after rolling is 30-60% of the initial thickness;
and/or the foil is an aluminum foil.
7. The method of claim 6, wherein the inert atmosphere is nitrogen.
8. A carbon-coated foil produced by the production method according to any one of claims 5 to 7.
9. A lithium ion battery having high corrosion resistance, comprising the carbon-coated foil of claim 8.
10. Use of a carbon-coated foil according to claim 9 in a lithium ion battery having high corrosion resistance.
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| CN112322099A (en) * | 2020-10-21 | 2021-02-05 | 河北银隆新能源有限公司 | Primer slurry, battery pole piece, preparation method of battery pole piece and battery |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112322099A (en) * | 2020-10-21 | 2021-02-05 | 河北银隆新能源有限公司 | Primer slurry, battery pole piece, preparation method of battery pole piece and battery |
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