Multi-material composite current collector

Abstract

The utility model discloses a multi-material composite current collector which comprises a thin film conducting layer, conducting layers are covered on the front side and the back side of the thin film conducting layer, and the thin film conducting layer and the conducting layers are made of metal materials. According to the utility model, the process of plating a conductive copper layer on the surface of a non-metal high polymer material in the traditional current collector is replaced by plating a corresponding conductive metal layer on the surface of a metal foil material, the thin film conductive layer is formed by adopting a conventional foil material manufacturing method, and then the conductive layer is deposited on the surface of the metal foil material in a manner of evaporation plating or magnetron sputtering and the like, so that the traditional process is simplified; and the prepared current collector structure has good conductivity and is more stable.

Description

Technical Field

[0001] The utility model relates to the technical field of lithium batteries, in particular to a multi-material composite current collector. Background Art

[0002] Lithium-ion batteries play an important role in the development of electric vehicles and energy storage. The dual-electrode approach avoids the use of a large number of passive components and external wires that are usually required for packaging, thereby reducing the overall resistance, volume, weight, complexity and cost of the battery. In this battery structure, the anode and cathode electrodes are coated on both sides of the current collector. The composite current collector is a conductive metal foil made of high-density material;

[0003] At present, the current collector base film of lithium-ion batteries is made of polymer materials such as PP, PET, and PI. The process is relatively complicated, and the structural stability of plastic materials is generally poor, and the service life is relatively low;

[0004] Therefore, those skilled in the art provide a multi-material composite current collector to solve the problems raised in the above background technology. Utility Model Content

[0005] The utility model aims to solve the shortcomings in the prior art and proposes a multi-material composite current collector.

[0006] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0007] A multi-material composite current collector, comprising a thin film conductive layer, both the front and back sides of the thin film conductive layer are covered with conductive layers, and both the thin film conductive layer and the conductive layer are made of metal materials;

[0008] The specific steps of the preparation method of the current collector are:

[0009] (1) Prepare a metal foil by calendering or electrolysis, and perform corresponding flattening treatment on the foil to obtain a thin film conductive layer;

[0010] (2) First, plasma clean the thin film conductive layer, then place the rolled thin film conductive layer into the vacuum chamber of the double-sided coating machine, seal the vacuum chamber, and evacuate the inside of the equipment to below 0.01Pa through the vacuum pump group, introduce argon gas, adjust the pressure in the equipment from 0.01Pa to 1Pa, turn on the coating power supply, and coat the conductive layer on both sides of the thin film conductive layer at the same time. Adjust the unwinding speed, winding speed and coating power supply power, and the target atoms form a copper plating layer, i.e., the conductive layer, on the moving thin film conductive layer.

[0011] Preferably, the material of the thin film conductive layer is one of Al, Fe and alloys thereof, and the conductive layer is one of Cu and alloys thereof.

[0012] Preferably, the thin film conductive layer has a thickness of 1 nm-20 um.

[0013] Preferably, the conductive layer has a thickness of 1 nm-20 um.

[0014] Preferably, the coating method in step (2) is one of thermal evaporation, magnetron sputtering, multi-arc ion plating and their combinations, and the coating power supply is one of direct current, pulse, medium frequency and microwave power supply and their combinations.

[0015] Compared with the prior art, the utility model has the following beneficial effects: the utility model replaces the traditional current collector process of plating a conductive copper layer on the surface of a non-metallic polymer material with a process of plating a corresponding conductive metal layer on the surface of a metal foil, adopts a conventional foil manufacturing method to make a thin film conductive layer, and then deposits a conductive layer on the surface of the metal foil by evaporation plating or magnetron sputtering, thereby simplifying the traditional process, and the prepared current collector structure has good conductive properties and a more stable structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more specifically and intuitively illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art are briefly introduced below.

[0017] Figure 1 This is a schematic diagram of the structure proposed by the utility model.

[0018] In the figure: 1. Thin film conductive layer; 2. Conductive layer. DETAILED DESCRIPTION

[0019] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments.

[0020] Reference Figure 1 , a multi-material composite current collector, comprising a thin film conductive layer 1, both sides of the thin film conductive layer 1 are covered with a conductive layer 2, and both the thin film conductive layer 1 and the conductive layer 2 are made of metal materials;

[0021] The specific steps of the preparation method of the current collector are:

[0022] (1) preparing a metal foil by a calendering method or an electrolytic method, and performing corresponding flattening treatment on the foil to obtain a thin film conductive layer 1;

[0023] (2) First, plasma clean the thin film conductive layer 1, then place the rolled thin film conductive layer 1 into the vacuum chamber of the double-sided coating machine, seal the vacuum chamber, and evacuate the inside of the equipment to below 0.01Pa through a vacuum pump group, introduce argon gas, adjust the pressure in the equipment from 0.01Pa to 1Pa, turn on the coating power supply, and coat the conductive layer 2 on both sides of the thin film conductive layer at the same time, adjust the unwinding speed, winding speed and coating power supply power, and the target atoms form a copper coating layer, i.e., the conductive layer 2, on the moving thin film conductive layer;

[0024] The technical solution adopted above replaces the traditional polymer base film materials such as PP, PET, PI, etc. with a thin film conductive layer 1. The structure of the thin film conductive layer 1 is a metal foil material, which can be prepared by traditional calendering or electrolysis, which simplifies the process flow, and the metal base film structure is more stable and has better strength.

[0025] The material of the thin film conductive layer 1 is one of Al, Fe and their alloys, and the material of the conductive layer 2 is one of Cu and its alloys.

[0026] The thickness of the thin film conductive layer 1 is 1nm-20um.

[0027] The thickness of the conductive layer 2 is 1 nm-20 um.

[0028] In step (2), the coating method is one of thermal evaporation, magnetron sputtering, multi-arc ion plating and their combinations, and the coating power supply is one of direct current, pulse, medium frequency, microwave power supply and their combinations.

[0029] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes within the technical scope disclosed by the present invention according to the technical scheme and the utility model concept of the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A multi-material composite current collector, comprising a thin film conductive layer (1), characterized in that: The front and back sides of the thin film conductive layer (1) are both covered with conductive layers (2); the thin film conductive layer (1) and the conductive layer (2) are both made of metal materials; the material of the thin film conductive layer (1) is one of Al, Fe and alloys thereof, and the conductive layer (2) is one of Cu and alloys thereof.

2. A multi-material composite current collector according to claim 1, characterized in that: The thin film conductive layer (1) has a thickness of 1 nm-20 um.

3. The multi-material composite current collector according to claim 1, characterized in that: The conductive layer (2) has a thickness of 1 nm-20 um.

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