Composite copper foil for semi-solid lithium battery

Abstract

The utility model discloses a composite copper foil for a semi-solid lithium battery, which comprises a film layer, two sides of the film layer are respectively provided with a metal isolation layer, one side of the metal isolation layer far away from the film layer is provided with a metal combination layer, and one side of the metal combination layer far away from the metal isolation layer is provided with a conductive copper layer. And a metal protection layer is arranged on one surface, far away from the metal bonding layer, of the conductive copper layer. The weight of the semi-solid lithium battery can be reduced, the manufacturing cost of the semi-solid lithium battery can be reduced, and the service life of the semi-solid lithium battery can be prolonged.

Description

Technical Field

[0001] The utility model relates to the technical field of battery production, in particular to a composite copper foil for a semi-solid lithium battery. Background Art

[0002] Existing semi-solid-state lithium batteries generally use electrolytic copper foil as the negative electrode current collector. Because electrolytic copper foil is generally solid copper, it is heavy and requires a large amount of copper material, resulting in high cost. This leads to a heavy weight and increased manufacturing costs for semi-solid-state lithium batteries. Furthermore, electrolytic copper foil is easily corroded by sulfides produced during electrolysis in semi-solid-state lithium batteries, resulting in a short service life and thus a reduced lifespan. Utility Model Content

[0003] In order to overcome the deficiencies of the prior art, the utility model provides a composite copper foil for a semi-solid lithium battery, which can reduce the weight of the semi-solid lithium battery and reduce the manufacturing cost of the semi-solid lithium battery, while extending the service life of the semi-solid lithium battery.

[0004] The technical solution adopted by the utility model to solve its technical problems is:

[0005] The utility model provides a composite copper foil for a semi-solid lithium battery, comprising a thin film layer, wherein a metal isolation layer is respectively provided on both sides of the thin film layer, a metal bonding layer is provided on a side of the metal isolation layer away from the thin film layer, a conductive copper layer is provided on a side of the metal bonding layer away from the metal isolation layer, and a metal protective layer is provided on a side of the conductive copper layer away from the metal bonding layer.

[0006] As a preferred technical solution, the film layer is a PET film layer, a PP film layer, a PI film layer or a PE film layer.

[0007] As a preferred technical solution, the thickness of the film layer is 1-30 μm.

[0008] As a preferred technical solution, the material of the metal isolation layer and the metal protection layer are both one of cobalt, aluminum, nickel, cadmium, magnesium, lithium and manganese.

[0009] As a preferred technical solution, the thickness of the metal isolation layer is 5-100 nm.

[0010] As a preferred technical solution, the material of the metal bonding layer is copper or copper alloy.

[0011] As a preferred technical solution, the thickness of the metal bonding layer is 10-200 nm.

[0012] As a preferred technical solution, the thickness of the conductive copper layer is 500-2000 nm.

[0013] As a preferred technical solution, the thickness of the metal protective layer is 5-2000 nm.

[0014] The beneficial effects of the present invention are as follows: the present invention can reduce the weight of the composite copper foil and the amount of copper material used by providing a thin film layer, thereby reducing the weight of the semi-solid lithium battery and the manufacturing cost of the semi-solid lithium battery; the conductive copper layer provided can meet the current carrying performance requirements and tensile strength requirements of the composite copper foil, thereby meeting the performance requirements of the semi-solid lithium battery; the metal protective layer provided can protect the conductive copper layer, thereby preventing the sulfide in the electrolyte of the semi-solid lithium battery from corroding the conductive copper layer, thereby extending the service life of the composite copper foil, thereby extending the service life of the semi-solid lithium battery. In addition, the metal isolation layer provided can isolate the conductive copper layer and the thin film layer, thereby protecting the thin film layer, and preventing the thin film layer from being burned through during the high and low temperature cycle test of the semi-solid lithium battery, thereby improving the stability of the composite copper foil during the high and low temperature cycle test of the semi-solid lithium battery; the metal bonding layer provided can improve the adhesion between the metal isolation layer and the conductive copper layer, thereby preventing the conductive copper layer from falling off. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0016] Figure 1 This is a schematic structural diagram of a composite copper foil for a semi-solid lithium battery provided by one embodiment of the present invention;

[0017] Figure 2 is based on Figure 1 The composite copper foil for semi-solid lithium batteries shown is a flow chart schematic diagram of a method for preparing the composite copper foil for semi-solid lithium batteries. DETAILED DESCRIPTION

[0018] The following will clearly and completely describe the concept, specific structure and technical effects of the present invention in combination with the embodiments and drawings, so as to fully understand the purpose, characteristics and effects of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, other embodiments obtained by technical personnel in this field without creative work are within the scope of protection of the present invention. In addition, all the connection / connection relationships involved in the patent do not refer to the direct connection of components, but refer to the fact that a better connection structure can be formed by adding or reducing connection accessories according to the specific implementation situation. The various technical features in the creation of the present invention can be combined interactively without conflicting with each other.

[0019] Please refer to Figure 1An embodiment of the present invention provides a composite copper foil for a semi-solid lithium battery, comprising a thin film layer 10, wherein a metal isolation layer 20 is provided on each side of the thin film layer 10, a metal bonding layer 30 is provided on the side of the metal isolation layer 20 away from the thin film layer 10, a conductive copper layer 40 is provided on the side of the metal bonding layer 30 away from the metal isolation layer 20, and a metal protective layer 50 is provided on the side of the conductive copper layer 40 away from the metal bonding layer 30.

[0020] Through the above structure, the composite copper foil of the present invention, the film layer 10 as the supporting layer, has the characteristics of light weight, low cost and good ductility, can reduce the weight of the composite copper foil and can reduce the amount of copper material, thereby reducing the weight of the semi-solid lithium battery and the manufacturing cost of the semi-solid lithium battery, and at the same time can improve the ductility of the composite copper foil, the conductive copper layer 40 is set, and has good conductivity, can meet the current carrying performance requirements and tensile strength requirements of the composite copper foil, thereby meeting the performance requirements of the semi-solid lithium battery, the metal isolation layer 20 is set, and can isolate the conductive copper layer 40 and the film layer 10, thereby 0 plays a protective role. During the high and low temperature cycle test of the semi-solid lithium battery, the film layer 10 can be prevented from being burned through, thereby improving the stability of the composite copper foil during the high and low temperature cycle test of the semi-solid lithium battery. The provided metal bonding layer 30 can improve the adhesion between the metal isolation layer 20 and the conductive copper layer 40, and can prevent the conductive copper layer 40 from falling off. The provided metal protective layer 50 protects the conductive copper layer 40, thereby preventing the sulfide in the semi-solid lithium battery electrolyte from corroding the conductive copper layer 40, extending the service life of the composite copper foil, and thus extending the service life of the semi-solid lithium battery.

[0021] In this embodiment, a metal isolation layer 20 is respectively provided on both sides of the thin film layer 10 by magnetron sputtering, evaporation or chemical plating, a metal bonding layer 30 is provided on the side of the metal isolation layer 20 away from the thin film layer 10 by magnetron sputtering, evaporation or chemical plating, a conductive copper layer 40 is provided on the side of the metal bonding layer 30 away from the metal isolation layer 20 by electroplating or evaporation, and a metal protective layer 50 is provided on the side of the conductive copper layer 40 away from the metal bonding layer 30 by magnetron sputtering or evaporation.

[0022] Film layer 10 is a PET (Polyethylene terephthalate) film layer. It is understood that film layer 10 may also be a PP (Polypropylene) film layer, a PI (Polyimide) film layer, a PE (Polyethylene) film layer, or the like. The low density of PET, PP, PI, and PE film layers further reduces the weight of the composite copper foil, thereby further reducing the weight of the semi-solid lithium battery.

[0023] The metal isolation layer 20 and the metal protective layer 50 are both made of one or more of cobalt, aluminum, nickel, cadmium, magnesium, lithium, and manganese. When the metal protective layer 50 is made of lithium, it can also replenish the lithium ions in the electrolyte of the semi-solid lithium battery, thereby increasing the capacity and service life of the semi-solid lithium battery.

[0024] The material of the metal bonding layer 30 is copper or a copper alloy, and the material of the conductive copper layer 40 is copper. The metal bonding layer 30 uses copper or a copper alloy. When the conductive copper layer 40 is provided on the side of the metal bonding layer 30 away from the metal isolation layer 20 by electroplating or evaporation, the speed of generating the conductive copper layer 40 can be increased.

[0025] The thickness of the thin film layer 10 is 1-30 μm (micrometer), preferably 10 μm, the thickness of the metal isolation layer 20 is 5-100 nm (nanometer), preferably 50 nm, the thickness of the metal bonding layer 30 is 10-200 nm, preferably 100 nm, the thickness of the conductive copper layer 40 is 500-2000 nm, preferably 1000 nm, and the thickness of the metal protective layer 50 is 5-2000 nm, preferably 1000 nm. With this thickness, the total thickness of the composite copper foil of the present invention is between 2.04-38.6 μm. The small thickness can further reduce the weight of the composite copper foil, thereby further reducing the weight of the semi-solid lithium battery.

[0026] Please refer to Figure 2 The present invention further provides a method for preparing the semi-solid lithium battery composite copper foil based on the above-mentioned semi-solid lithium battery composite copper foil, comprising the following steps:

[0027] S1. Provide a film layer 10. The width and length of the film layer 10 can be set according to actual conditions. The film layer 10 is a PET film layer, a PP film layer, a PI film layer, or a PE film layer. The thickness of the film layer 10 is 1-30 μm.

[0028] S2. A metal barrier layer 20 is formed on both sides of the thin film layer 10 by magnetron sputtering, evaporation, or chemical plating. The metal barrier layer 20 is made of one or more of cobalt, aluminum, nickel, cadmium, magnesium, lithium, and manganese. The thickness of the metal barrier layer 20 is 5-100 nm.

[0029] S3. A metal bonding layer 30 is formed on the side of the metal isolation layer 20 away from the thin film layer 10 by magnetron sputtering, evaporation, or chemical plating. The metal bonding layer 30 is made of copper or a copper alloy and has a thickness of 10-200 nm.

[0030] S4. A conductive copper layer 40 is formed on the side of the metal bonding layer 30 away from the metal isolation layer 20 by electroplating or evaporation. The thickness of the conductive copper layer 40 is 500-2000 nm.

[0031] S5. A metal protective layer 50 is formed on the surface of the conductive copper layer 40 away from the metal bonding layer 30 by magnetron sputtering or evaporation. The metal protective layer 50 is made of one or more of cobalt, aluminum, nickel, cadmium, magnesium, lithium, and manganese. The thickness of the metal protective layer 50 is 5-2000 nm.

[0032] The preparation method of the utility model is simple in process, and the composite copper foil prepared is light in weight and low in cost, thereby reducing the weight of the semi-solid lithium battery and reducing the manufacturing cost of the semi-solid lithium battery, while extending the service life of the semi-solid lithium battery, greatly meeting the use requirements.

[0033] The above is a specific description of the preferred implementation of the present invention, but the invention of the present invention is not limited to the embodiments. Those skilled in the art can make various equivalent modifications or substitutions without violating the spirit of the present invention. These equivalent modifications or substitutions are all included in the scope defined by the claims of this application.

Claims

1. A composite copper foil for a semi-solid lithium battery, characterized in that: It includes a thin film layer, wherein a metal isolation layer is provided on both sides of the thin film layer, a metal bonding layer is provided on the side of the metal isolation layer away from the thin film layer, a conductive copper layer is provided on the side of the metal bonding layer away from the metal isolation layer, and a metal protective layer is provided on the side of the conductive copper layer away from the metal bonding layer.

2. The composite copper foil for semi-solid lithium battery according to claim 1, characterized in that The film layer is a PET film layer, a PP film layer, a PI film layer or a PE film layer.

3. The composite copper foil for semi-solid lithium battery according to claim 1, characterized in that The thickness of the film layer is 1-30 μm.

4. The composite copper foil for semi-solid lithium battery according to claim 1, characterized in that The metal isolation layer and the metal protection layer are made of one of cobalt, aluminum, nickel, cadmium, magnesium, lithium and manganese.

5. The composite copper foil for semi-solid lithium battery according to claim 1, characterized in that The thickness of the metal isolation layer is 5-100 nm.

6. The composite copper foil for semi-solid lithium battery according to claim 1, characterized in that The material of the metal bonding layer is copper or copper alloy.

7. The composite copper foil for semi-solid lithium battery according to claim 1, characterized in that The thickness of the metal bonding layer is 10-200 nm.

8. The composite copper foil for semi-solid lithium battery according to claim 1, characterized in that The thickness of the conductive copper layer is 500-2000 nm.

9. The composite copper foil for semi-solid lithium battery according to claim 1, characterized in that The thickness of the metal protective layer is 5-2000 nm.

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