CN110739436A - Graphene-silver composite tab, preparation method thereof and lithium battery pole piece - Google Patents
Graphene-silver composite tab, preparation method thereof and lithium battery pole piece Download PDFInfo
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- CN110739436A CN110739436A CN201911031932.1A CN201911031932A CN110739436A CN 110739436 A CN110739436 A CN 110739436A CN 201911031932 A CN201911031932 A CN 201911031932A CN 110739436 A CN110739436 A CN 110739436A
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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
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/50—Current conducting connections for cells or batteries
- H01M50/531—Electrode connections inside a battery casing
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B1/00—Conductors or conductive bodies characterised by the conductive materials; Selection of materials as conductors
- H01B1/02—Conductors or conductive bodies characterised by the conductive materials; Selection of materials as conductors mainly consisting of metals or alloys
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B1/00—Conductors or conductive bodies characterised by the conductive materials; Selection of materials as conductors
- H01B1/04—Conductors or conductive bodies characterised by the conductive materials; Selection of materials as conductors mainly consisting of carbon-silicon compounds, carbon or silicon
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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
- H01M10/60—Heating or cooling; Temperature control
- H01M10/61—Types of temperature control
- H01M10/613—Cooling or keeping cold
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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
- H01M10/60—Heating or cooling; Temperature control
- H01M10/62—Heating or cooling; Temperature control specially adapted for specific applications
- H01M10/625—Vehicles
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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
- H01M10/60—Heating or cooling; Temperature control
- H01M10/65—Means for temperature control structurally associated with the cells
- H01M10/653—Means for temperature control structurally associated with the cells characterised by electrically insulating or thermally conductive materials
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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
- H01M10/60—Heating or cooling; Temperature control
- H01M10/65—Means for temperature control structurally associated with the cells
- H01M10/654—Means for temperature control structurally associated with the cells located inside the innermost case of the cells, e.g. mandrels, electrodes or electrolytes
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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
- H01M4/13—Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulators; Processes of manufacture thereof
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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
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- 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 graphene-silver composite tab, a preparation method thereof and a lithium battery pole piece. The graphene-silver composite tab comprises: the electrode tab comprises an electrode tab substrate, a graphene layer and a silver layer. The graphene layer is formed on at least part of the surface of the tab substrate; the silver layer is formed on at least part of the surface of the graphene layer far away from the tab substrate. The graphene-silver composite tab can remarkably improve the electric conductivity and the heat conduction performance of the tab by adopting the graphene layer and the silver layer, and can effectively reduce the internal resistance and the temperature rise of the tab when being applied to a lithium battery pole piece.
Description
Technical Field
The invention relates to the technical field of lithium batteries, in particular to a graphene-silver composite tab and a preparation method thereof and a lithium battery pole piece.
Background
With the shortage of global petroleum resources and the aggravation of atmospheric environmental pollution. Energy-saving and environment-friendly pure electric vehicles have been recognized as the main direction of development of the automobile industry. Various automobile manufacturers at home and abroad slowly aim at pure electric automobiles and hybrid electric automobiles. These trends will certainly promote the rapid development of new energy automobile industry, and also provide a good platform for the production and research and development of lithium ion batteries. However, the existing lithium battery pole piece still has the problems of low heat conductivity, low electric conductivity and the like, and the development of new energy automobiles is restricted.
Therefore, the existing lithium battery pole piece still needs to be improved.
Disclosure of Invention
The invention aims to solve technical problems in the related art at least at the degree of stroke, and therefore aims to provide a graphene-silver composite tab, a preparation method thereof and a lithium battery pole piece.
According to the embodiment of the invention, the graphene-silver composite tab comprises a tab substrate, a graphene layer and a silver layer, wherein the graphene layer is formed on at least part of the surface of the tab substrate, and the silver layer is formed on at least part of the surface, far away from the tab substrate, of the graphene layer.
According to the graphene-silver composite tab disclosed by the embodiment of the invention, the graphene layer has good heat conduction performance, the temperature rise in the working process of the tab can be effectively reduced, and the working stability of the tab is improved, in addition aspect, the silver layer formed on the graphene layer has very high conductivity, the conductivity of the tab can be effectively improved, the internal resistance of the tab is reduced, and the rate capability of a battery cell applying the tab is improved.
In addition, the graphene-silver composite tab according to the above embodiment of the invention may also have the following additional technical features:
in examples of the invention, the tab substrate is aluminum foil.
In embodiments of the present invention, the tab substrate has a thickness of 0.3 to 0.4 mm.
In embodiments of the present invention, the graphene layer has a thickness of 0.5-2.0 μm.
In embodiments of the present invention, the silver layer has a thickness of 3-7 μm.
According to another aspect of the invention, the invention provides methods for preparing the graphene-silver composite tab of the embodiment, and according to the embodiment of the invention, the method comprises the steps of (1) providing a tab substrate, (2) forming a graphene layer on at least part of the surface of the tab substrate, and (3) forming a silver layer on at least part of the surface of the graphene layer away from the tab substrate.
In addition, the method for preparing the graphene-silver composite tab according to the above embodiment of the invention may further have the following additional technical features:
in examples of the invention, in step (2), the graphene layer is formed on at least part of the surface of the tab substrate by using a carbon source through a Plasma Enhanced Chemical Vapor Deposition (PECVD) process.
In embodiments of the invention, the carbon source comprises at least selected from the group consisting of methane, ethane, ethylene, propylene, acetylene, methanol, ethanol, acetone, benzene, toluene, xylene, and benzoic acid.
In embodiments of the present invention, the flow rate of the carbon source is 15-20 sccm.
In embodiments of the present invention, the plasma enhanced chemical vapor deposition process conditions include a pressure of 0.5 to 2MPa, a temperature of 400 to 500 ℃, and a processing time of 30 to 120 min.
In examples of the present invention, the graphene layer is degreased in advance before step (3).
In examples of the present invention, the degreasing conditions include a current density of 4-8A/dm2Temperature ofThe temperature is 50-70 ℃.
In examples of the present invention, the graphene layer was activated after the degreasing process was completed.
In embodiments of the invention, the step (3) and the step () include (3-1) performing a th electroplating treatment on at least a part of the surface of the graphene layer away from the tab substrate to form a th silver plating layer on at least a part of the graphene layer away from the tab substrate, and (3-2) performing a second electroplating treatment on the th silver plating layer to obtain a second silver plating layer.
In examples of the present invention, the electroplating process conditions include a current density of 2-4A/dm2The temperature is 18-25 ℃.
In examples of the present invention, the second electroplating process is performed under conditions including a current density of 50-90A/dm2The temperature is 70-90 ℃.
In another aspect of the present invention, the present invention provides lithium battery pole pieces, which include a current collector foil according to an embodiment of the present invention, wherein the current collector foil is formed with the graphene-silver composite tab of the above embodiment, so that the lithium battery pole piece has all the features and advantages described above for the graphene-silver composite tab, and is not described in detail in .
In addition, the lithium battery pole piece according to the above embodiment of the present invention may further have the following additional technical features:
in examples of the present invention, the current collector foil is aluminum foil.
Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
Drawings
The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
fig. 1 is a schematic flow diagram of a method for manufacturing graphene-silver composite tabs according to embodiments of the present invention;
fig. 2 is a schematic flow chart of a method for manufacturing graphene-silver composite tabs according to still another embodiments of the present invention.
Detailed Description
The following describes embodiments of the present invention in detail. The following examples are illustrative only and are not to be construed as limiting the invention. The examples, where specific techniques or conditions are not indicated, are to be construed according to the techniques or conditions described in the literature in the art or according to the product specifications. The reagents or instruments used are not indicated by the manufacturer, and are all conventional products commercially available.
Thus, a feature defined as "", "second" may or may not include at least of that feature.
The aspects of the invention provide graphene-silver composite tabs, and according to the embodiment of the invention, the graphene-silver composite tabs comprise tab substrates, graphene layers and silver layers, wherein the graphene layers are formed on at least part of the surfaces of the tab substrates, and the silver layers are formed on at least part of the surfaces, far away from the tab substrates, of the graphene layers.
According to the graphene-silver composite tab disclosed by the embodiment of the invention, the graphene layer has good heat conduction performance, the temperature rise in the working process of the tab can be effectively reduced, and the working stability of the tab is improved, in addition aspect, the silver layer formed on the graphene layer has very high conductivity, the conductivity of the tab can be effectively improved, the internal resistance of the tab is reduced, and the rate capability of a battery cell applying the tab is improved.
A graphene-silver composite tab according to an embodiment of the present invention is further described in step below.
According to embodiments of the present invention, the specific type of the tab substrate is not particularly limited, and current collector foils (such as copper foil, aluminum foil, etc.) commonly used in the art can be used, and then the tab substrate is obtained by performing tab die cutting on the current collector foils, according to embodiments of the present invention, the tab substrate is an aluminum foil.
According to embodiments of the present invention, the thickness of the tab substrate may be 0.3-0.4 mm, such as 0.30m, 0.32mm, 0.35mm, 0.38mm, 0.40mm, etc., if the thickness of the tab substrate is too small, the overcurrent capacity and tensile strength of the battery may be reduced, and if the thickness of the tab substrate is too large, the internal resistance of the tab may be increased, which may affect the rate capability of the battery cell.
According to embodiments of the present invention, the thickness of the graphene layer may be 0.5-2.0 μm, such as 0.5 μm, 0.8 μm, 1.0 μm, 1.2 μm, 1.5 μm, 1.8 μm, 2.0 μm, etc. specifically, the thickness of the graphene layer may be adjusted by adjusting specific operating conditions in the step of depositing graphene by PECVD method.
According to embodiments of the present invention, the thickness of the silver layer may be 3-7 μm, such as 3 μm, 4 μm, 5 μm, 6 μm, 7 μm, etc. specifically, the thickness of the silver layer may be adjusted by adjusting specific operating conditions in the silver electroplating process.
According to another aspect of the invention, the invention provides methods for preparing the graphene-silver composite tab of the embodiment, and according to the embodiment of the invention, the method comprises the steps of (1) providing a tab substrate, (2) forming a graphene layer on at least part of the surface of the tab substrate, and (3) forming a silver layer on at least part of the surface of the graphene layer away from the tab substrate.
A method of manufacturing a graphene-silver tab according to an embodiment of the present invention is described in further detail below in step with reference to fig. 1, the method includes, according to an embodiment of the present invention:
s100: providing tab substrates
According to the embodiments of the invention, the tab substrate is an aluminum foil, which is commonly used as a positive current collector of a lithium battery, but has relatively low electric and thermal conductivity, and the problems of overhigh temperature rise of the tab end, reduced rate performance of an electric core and the like are easily caused in the work of the tab obtained by die cutting the aluminum foil.
S200: formation of graphene layer
In this step, a graphene layer is formed on at least a part of the surface of the tab substrate. According to an embodiment of the present invention, the graphene layer may be formed on at least a portion of the surface of the tab substrate by a PECVD method. For the material (such as Cu or Al) of the tab substrate, the PECVD method can form the graphene layer on the surface of the tab substrate stably by using a carbon source, and the thickness of the obtained graphene is easy to control. Specifically, the PECVD method may be performed as follows: and placing the current collector foil subjected to the die cutting of the tab in a PECVD reaction bin through a die, and exposing the tab matrix on the current collector foil. Protective gas (such as nitrogen, argon, hydrogen and the like) and a carbon source are supplied to the PECVD reaction bin, C, H in the carbon source is separated under the conditions of proper temperature and pressure, and ions are utilized to generate glow to uniformly cover the surface of the tab substrate, so that the C deposits and grows a graphene layer on the surface of the tab substrate.
According to embodiments of the present invention, the carbon source may include at least selected from methane, ethane, ethylene, propylene, acetylene, methanol, ethanol, acetone, benzene, toluene, xylene, and benzoic acid, is widely available and easily accessible, and a graphene layer may be formed on the surface of the tab substrate by a PECVD method, in embodiments, a gaseous carbon source is used as the carbon source, so that a carbon source gas and a protective gas may be co-introduced into a PECVD reaction chamber in a ratio of to simplify the operation.
According to the embodiments of the present invention, the flow rate of the carbon source may be 15 to 20sccm, such as 15sccm, 17sccm, 19sccm, 20sccm, etc. therefore, the efficiency of forming the graphene layer may be improved and the thickness of the graphene layer may be easily controlled .
According to embodiments of the present invention, the conditions of the PECVD process include a pressure of 0.5 to 2MPa (e.g., 0.5MPa, 0.8MPa, 1.0MPa, 1.2MPa, 1.5MPa, 1.8MPa, or 2.0 MPa), a temperature of 400 to 500 ℃ (e.g., 400 ℃, 425 ℃, 450 ℃, 475 ℃, or 500 ℃, etc.), and a processing time of 30 to 120min (e.g., 30min, 60min, 90min, or 120min, etc.).
S300: formation of silver layer
In the step, a silver layer is formed on at least part of the surface of the graphene layer far away from the tab substrate. According to an embodiment of the present invention, the silver layer may be formed by an electroplating process. Specifically, the plating treatment may be performed by placing the graphene layer in a plating solution and applying an electric current of an appropriate density.
According to embodiments of the invention, referring to fig. 2, S300 may further comprise step of:
s310 electroplating treatment at th
In the step, electroplating treatment is carried out on at least part of the surface of the graphene layer far away from the tab substrate, so that silver plating layer is formed on at least part of the graphene layer far away from the tab substrate.
According to embodiments of the present invention, the electroplating process includes a current density of 2-4A/dm2(e.g., 2A/dm)2、2.5A/dm2、3A/dm2、3.5A/dm2Or 4A/dm2And the like) at room temperature, for example, 18 to 25 ℃, specifically, 18 ℃, 20 ℃, 23 ℃ or 25 ℃, by subjecting the graphene layer to th electroplating treatment under the above conditions, pre-silver plating can be formed on the surface of the graphene layer, and then the subsequent second electroplating treatment can further improve the electroplating effect of the silver layer by steps, and the thickness of the silver layer is easier to control.
S320: second electroplating treatment
In this step, the th silver plating layer was subjected to a second plating treatment to obtain a second silver plating layer.
According to embodiments of the present invention, the second electroplating process is performed under conditions including a current density of 50-90A/dm2(e.g., 50A/dm)2、60A/dm2、70A/dm2、80A/dm2Or 90A/dm2Etc.) at 70 to 90 c (e.g., 70 c, 75 c, 80 c, 85 c, or 90 c, etc.), the plating effect of the silver layer can be further improved by steps by performing a secondary plating process on the th silver plating layer under the above conditions, and the thickness of the silver layer can be more easily controlledThe concentration of the silver potassium cyanide in the plating solution is preferably 60 to 80 g/L.
According to embodiments of the present invention, before S300, the graphene layer may be degreased in advance, so that oil generated by the graphene layer due to the PECVD process may be effectively removed.
According to embodiments of the invention, graphene layer can be degreased by electrochemical degreasing treatment, specifically, the degreasing treatment conditions include a current density of 4-8A/dm2(e.g., 4A/dm)2、5A/dm2、6A/dm2、7A/dm2Or 8A/dm2Etc.) at a temperature of 50 to 70 ℃ (e.g., 50 ℃, 55 ℃, 60 ℃, 65 ℃, or 70 ℃, etc.), thereby further improving the effect of removing oil from the graphene layer.
According to embodiments of the present invention, after the degreasing process is completed, the graphene layer may be activated, specifically, the activation process may be performed by immersing the graphene layer in an activation solution, according to an embodiment of the present invention, the activation solution may be a strong acid solution having a concentration of 70 to 90g/L, and the graphene layer may be activated by using a strong acid, which may be sulfuric acid, hydrofluoric acid, or the like, to further facilitate the attachment of silver to the surface of the graphene layer .
In another aspect of the present invention, the present invention provides lithium battery pole pieces, which include a current collector foil according to an embodiment of the present invention, wherein the current collector foil is formed with the graphene-silver composite tab of the above embodiment, so that the lithium battery pole piece has all the features and advantages described above for the graphene-silver composite tab, and is not described in detail in .
According to embodiments of the invention, the current collector foil is an aluminum foil, which is commonly used as a positive current collector of a lithium battery, but has relatively low electric and thermal conductivity.
The invention will now be described with reference to specific examples, which are intended to be illustrative only and not to be limiting in any way.
Example 1
Placing the aluminum tab into a plasma chemical vapor deposition device, introducing argon, heating the device to 600 ℃ at the heating rate of 15 ℃/min, then introducing methane at the flow rate of 15sccm, controlling the pressure of a reaction chamber to be 1MPa, adjusting the plasma device to generate uniform glow to cover the aluminum foil, and reacting for 30 min. After the reaction is finished, cooling the equipment to 25 ℃, and obtaining the graphene composite aluminum tab with the vertical graphene layer.
Electroplating graphene layer of the graphene composite aluminum tab with Ag at 50 ℃ by using 4A/dm2The current density of carrying out graphite alkene layer deoiling of compound aluminium utmost point ear of graphite alkene handles, places graphite alkene layer in the activating solution and soaks at normal temperature, and the activating solution adopts the concentrated sulfuric acid that concentration is 80g/L, accomplishes the activation of graphite alkene layer. Then using 2A/dm at room temperature2The current density of the silver plating solution is used for pre-plating Ag, and the electroplating solution adopts aqueous solution of silver potassium cyanide and potassium cyanide, wherein the concentration of the silver potassium cyanide is 10g/L, and the concentration of the potassium cyanide is 120 g/L. Electroplating with 70g/L silver potassium cyanide water solution at 80 deg.C with current density of 70A/dm2And obtaining a second silver plating layer to obtain a graphene-silver composite tab product.
Example 2
Placing the aluminum tab into a plasma chemical vapor deposition device, introducing argon, heating the device to 400 ℃ at the heating rate of 15 ℃/min, then introducing methane at the flow rate of 15sccm, controlling the pressure of a reaction chamber to be 1MPa, adjusting the plasma device to generate uniform glow to cover the aluminum foil, and reacting for 30 min. After the reaction is finished, cooling the equipment to 25 ℃, and obtaining the graphene composite aluminum tab with the vertical graphene layer.
Compounding graphene with aluminum tabsThe graphene layer is electroplated with Ag at 50 ℃ with 4A/dm2The current density of carrying out graphite alkene layer deoiling of compound aluminium utmost point ear of graphite alkene handles, places graphite alkene layer in the activating solution and soaks at normal temperature, and the activating solution adopts the concentrated sulfuric acid that concentration is 80g/L, accomplishes the activation of graphite alkene layer. Then using 2A/dm at room temperature2The current density of the silver plating solution is used for pre-plating Ag, and the electroplating solution adopts aqueous solution of silver potassium cyanide and potassium cyanide, wherein the concentration of the silver potassium cyanide is 10g/L, and the concentration of the potassium cyanide is 120 g/L. Electroplating with 70g/L silver potassium cyanide water solution at 80 deg.C with current density of 70A/dm2And obtaining a second silver plating layer to obtain a graphene-silver composite tab product.
Example 3
Placing the aluminum tab into a plasma chemical vapor deposition device, introducing argon, heating the device to 600 ℃ at the heating rate of 15 ℃/min, then introducing methane at the flow rate of 15sccm, controlling the pressure of a reaction chamber to be 1MPa, adjusting the plasma device to generate uniform glow to cover the aluminum foil, and reacting for 90 min. After the reaction is finished, cooling the equipment to 25 ℃, and obtaining the graphene composite aluminum tab with the vertical graphene layer.
Electroplating graphene layer of the graphene composite aluminum tab with Ag at 50 ℃ by using 4A/dm2The current density of the graphene layer is subjected to oil removal treatment, the graphene layer is placed in an activating solution at normal temperature for soaking, and the activating solution is hydrofluoric acid with the concentration of 80g/L to complete activation of the graphene layer. Then using 2A/dm at room temperature2The current density of the silver plating solution is used for pre-plating Ag, and the electroplating solution adopts aqueous solution of silver potassium cyanide and potassium cyanide, wherein the concentration of the silver potassium cyanide is 10g/L, and the concentration of the potassium cyanide is 120 g/L. Electroplating with 70g/L silver potassium cyanide water solution at 80 deg.C with current density of 70A/dm2And obtaining a second silver plating layer to obtain a graphene-silver composite tab product.
Example 4
Placing the aluminum tab into a plasma chemical vapor deposition device, introducing argon, heating the device to 600 ℃ at the heating rate of 15 ℃/min, then introducing methane at the flow rate of 15sccm, controlling the pressure of a reaction chamber to be 2MPa, adjusting the plasma device to generate uniform glow to cover the aluminum foil, and reacting for 30 min. After the reaction is finished, cooling the equipment to 25 ℃, and obtaining the graphene composite aluminum tab with the vertical graphene layer.
Electroplating graphene layer of the graphene composite aluminum tab with Ag at 50 ℃ by using 4A/dm2The current density of the graphene layer of the graphene composite aluminum tab is subjected to oil removal treatment, the graphene layer is placed in an activating solution at normal temperature for soaking, and the activating solution adopts hydrofluoric acid with the concentration of 80g/L to complete activation of the graphene layer. Then using 2A/dm at room temperature2The current density of the silver plating solution is used for pre-plating Ag, and the electroplating solution adopts aqueous solution of silver potassium cyanide and potassium cyanide, wherein the concentration of the silver potassium cyanide is 10g/L, and the concentration of the potassium cyanide is 120 g/L. Electroplating with 70g/L silver potassium cyanide water solution at 80 deg.C with current density of 70A/dm2And obtaining a second silver plating layer to obtain a graphene-silver composite tab product.
Comparative example 1
Conventional aluminum tabs are employed which do not have a graphene or silver layer.
Test example
The tabs in examples 1 to 4 and comparative example 1 were assembled to obtain lithium ion batteries, and the lithium ion batteries were subjected to different-rate discharge experiments to test internal resistance and temperature rise, and the results are shown in table 1.
TABLE 1 test results
| Internal resistance (m omega) | 1C temperature rise (. degree.C.) | |
| Example 1 | 0.767 | 6.7 |
| Example 2 | 0.799 | 7.5 |
| Example 3 | 0.749 | 7.3 |
| Example 4 | 0.823 | 8.3 |
| Comparative example 1 | 0.856 | 9.2 |
Test results show that the internal resistance and the 1C temperature rise of the battery prepared by the graphene-silver composite tab provided by the invention are obviously lower than those of a conventional aluminum tab. The graphene-silver composite tab provided by the invention can obviously improve the electric conductivity and the heat conduction performance of the tab by adopting the graphene layer and the silver layer, and can effectively reduce the internal resistance and the temperature rise of the tab when the tab is applied to a lithium battery pole piece.
In the description herein, reference to the terms " embodiments," " embodiments," "examples," "specific examples," or " examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least embodiments or examples of the invention.
Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art within the scope of the present invention.
Claims (10)
1, graphite alkene-silver composite tab, its characterized in that includes:
a tab substrate;
the graphene layer is formed on at least part of the surface of the tab substrate; and
and the silver layer is formed on at least part of the surface of the graphene layer far away from the lug base body.
2. The graphene-silver composite tab according to claim 1, wherein the tab substrate is an aluminum foil.
3. The graphene-silver composite tab according to claim 1, wherein the thickness of the tab substrate is 0.3-0.4 mm.
4. The graphene-silver composite tab according to claim 1, wherein the thickness of the graphene layer is 0.5-2.0 μm;
optionally, the thickness of the silver layer is 3-7 μm.
5, kinds of graphene-silver composite tabs according to any of claims 1-4, which are characterized by comprising the following components:
(1) providing a tab matrix;
(2) forming a graphene layer on at least part of the surface of the tab substrate;
(3) and forming a silver layer on at least part of the surface of the graphene layer far away from the lug base body.
6. The method as claimed in claim 5, wherein in the step (2), the graphene layer is formed on at least a portion of the surface of the tab substrate by using a carbon source through a plasma enhanced chemical vapor deposition process.
7. The method of claim 6, wherein the carbon source comprises at least selected from the group consisting of methane, ethane, ethylene, propylene, acetylene, methanol, ethanol, acetone, benzene, toluene, xylene, and benzoic acid;
optionally, the flow rate of the carbon source is 15-20 sccm;
optionally, the conditions of the plasma enhanced chemical vapor deposition process include: the pressure is 0.5-2 MPa, the temperature is 400-500 ℃, and the treatment time is 30-120 min.
8. The method according to claim 5, wherein before the step (3), the graphene layer is subjected to oil removal treatment in advance;
optionally, the conditions of the degreasing treatment include: the current density is 4-8A/dm2The temperature is 50-70 ℃;
optionally, after the degreasing treatment is completed, the graphene layer is subjected to an activation treatment.
9. The method of claim 5, wherein step (3) further comprises:
(3-1) subjecting at least part of the surface of the graphene layer away from the tab substrate to th electroplating treatment so as to form th silver plating layer on at least part of the graphene layer away from the tab substrate;
(3-2) subjecting said th silver plating layer to a second plating treatment to obtain a second silver plating layer;
optionally, the th electroplating treatment condition comprises that the current density is 2-4A/dm2The temperature is 18-25 ℃;
optionally, theThe conditions of the second plating treatment include: the current density is 50-90A/dm2The temperature is 70-90 ℃.
10, A lithium battery pole piece, comprising a current collector foil, wherein the current collector foil is formed with the graphene-silver composite tab of any of claims 1-9;
optionally, the current collector foil is an aluminum foil.
Priority Applications (1)
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