Three-dimensional composite copper sheet for solid-state lithium-ion battery and process for its preparation

Abstract

Three-dimensional composite copper sheet for solid-state lithium-ion battery and method for preparing it. The present invention relates to a three-dimensional composite copper sheet for solid-state lithium-ion battery and a method for preparing it, comprising: a support layer (10) which is a porous or fibrous film layer, a first metallization layer (20) and a second metallization layer (30) being respectively disposed on two sides of the support layer (10), a third metallization layer (40) being disposed on one side of the first metallization layer (20), and a fourth metallization layer (50) being disposed on one side of the second metallization layer (30); a first conductive copper layer (60) being disposed on the third metallization layer (40), and a second conductive copper layer (70) being disposed on the fourth metallization layer (50).FIGURE FROM THE ABRIDGED: FIG. 1.

Description

Title of the invention: Three-dimensional composite copper sheet for solid-state lithium-ion battery and method for preparing it. FIELD OF THE INVENTION

[0001] The present invention relates to the technical field of battery production, and more particularly to a three-dimensional composite copper sheet for solid lithium-ion battery and a method for preparing it. STATE OF THE ART

[0002] Existing solid-state lithium-ion batteries generally use a copper foil as the negative electrode collector. Since the copper foil is usually made of solid copper, the weight, usage, and cost of copper materials are greater, resulting in a higher weight and manufacturing cost for solid-state lithium-ion batteries. Furthermore, during the charging and discharging of the solid-state lithium-ion battery, because the copper foil does not have holes allowing lithium ions from the electrolyte to pass through, the lithium ions move from one side of the copper foil to the other side at a slower rate, thus reducing the charging and discharging rate of the solid-state lithium-ion battery. CONTENTS OF THE INVENTION

[0003] In order to resolve the drawbacks of the prior art, the present invention relates to a three-dimensional composite copper sheet for solid lithium-ion battery and a method for preparing it, which makes it possible to reduce the weight of the solid lithium-ion battery as well as its manufacturing cost, while improving its charging and discharging speed.

[0004] To this end, the present invention provides the following technical solution:

[0005] A first aspect of the present invention relates to providing a three-dimensional composite copper sheet for a solid-state lithium-ion battery, comprising: a support layer, the support layer being a porous film layer or a fibrous film layer, in which a first metallization layer and a second metallization layer are respectively disposed on two sides of the support layer, a third metallization layer is disposed on one side of the first metallization layer opposite the support layer, and a fourth metallization layer is disposed on one side of the second metallization layer opposite the support layer; a first conductive copper layer is disposed on one side of the third metallization layer opposite of the first layer of metallization, and a second conductive copper layer is arranged on one side of the fourth layer of metallization opposite the second layer of metallization.

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

[0007] According to a preferred technical solution, the fibrous film layer is a PET fibrous film layer, a PP fibrous film layer, a PI fibrous film layer or a PE fibrous film layer.

[0008] According to a preferred technical solution, pores of the porous film layer or of the fibrous film layer have a pore size of 0.05 to 500 sqm and a porosity of 0.1% to 80%.

[0009] According to a preferred technical solution, the first metallization layer and the second metallization layer are both made of one of cobalt, aluminium, nickel, cadmium, magnesium, lithium and manganese, or any combination thereof.

[0010] According to a preferred technical solution, the third metallization layer and the fourth metallization layer are both made of copper or a copper alloy.

[0011] According to a preferred technical solution, the thickness of the support layer is from 1 to 30 qm.

[0012] According to a preferred technical solution, the thickness of the first metallization layer and that of the second metallization layer are both from 5 to 100 nm, and the thickness of the third metallization layer and that of the fourth metallization layer are both from 10 to 200 nm.

[0013] According to a preferred technical solution, the thickness of the first conductive copper layer and that of the second conductive copper layer are both from 500 to 2000 nm.

[0014] A second aspect of the present invention relates to proposing a method for preparing a three-dimensional composite copper sheet for a solid-state lithium-ion battery, comprising the following steps:

[0015] IF: provide a support layer, the support layer being a porous film layer or a fibrous film layer;

[0016] S2: to dispose respectively of a first layer of metallization and a second layer of metallization on two sides of the support layer, by magnetron spraying, vacuum evaporation or chemical deposition;

[0017] S3: apply a third layer of metallization on one side of the first layer of metallization opposite the support layer, and apply a fourth layer metallization on one side of the second metallization layer opposite the support layer, by magnetron sputtering, vacuum evaporation or chemical deposition;

[0018] S4: to place a first conductive copper layer on one side of the third metallization layer opposite the first metallization layer, and to place a second conductive copper layer on one side of the fourth metallization layer opposite the second metallization layer, by vacuum evaporation or electrodeposition.

[0019] The beneficial effects of the present invention are as follows: according to the present invention, the arrangement of the support layer, which is a porous film layer or a fibrous film layer, makes it possible to reduce the weight of the composite copper sheet and the use of copper material, as well as the weight and manufacturing cost of the solid-state lithium-ion battery; during the charging and discharging of the solid-state lithium-ion battery, the pores on the porous film layer or the pores on the fibrous film layer can act as a passage for the movement of lithium ions in the electrolyte, so that the lithium ions in the electrolyte of the solid-state lithium-ion battery can move rapidly from one side of the composite copper sheet to its other side, thus improving the charging and discharging rate of the solid-state lithium-ion battery; furthermore,The arrangement of the first and second conductive copper layers can meet the load-bearing capacity and tensile strength requirements of composite copper sheets, thus fulfilling the performance requirements of solid-state lithium-ion batteries. Furthermore, the first metallization layer is designed to insulate the first conductive copper layer from the support layer, and the second metallization layer is designed to insulate the second conductive copper layer from the support layer, thereby providing protection for the support layer. This prevents the support layer from burning during high- and low-temperature cycling tests of solid-state lithium-ion batteries.This improves the stability of the composite copper foil during the testing process. The arrangement of the third and fourth metallization layers improves the adhesion between the first metallization layer and the first conductive copper layer, as well as the adhesion between the second metallization layer and the second conductive copper layer, thus preventing the first and second conductive copper layers from detaching. BRIEF DESCRIPTION OF THE FIGURES

[0020] The present invention is described in detail below in connection with the figures and embodiments.

[0021] [Fig-1] represents a structural diagram of a composite copper sheet three-dimensional for solid lithium-ion battery according to an embodiment of the present invention;

[0022] [Fig.2] represents a flowchart of a process for preparing a three-dimensional composite copper sheet for solid lithium-ion battery supplied on the basis of the three-dimensional composite copper sheet for solid lithium-ion battery illustrated in [Fig.1]. DETAILED DESCRIPTION OF THE IMPLEMENTATION METHODS

[0023] The design, specific structure, and resulting technical effects of the present invention will be clearly and fully described below, in conjunction with the embodiments and accompanying figures, in order to fully understand the objects, features, and effects of the present invention. Obviously, the embodiments described are a part, rather than all, of the embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work must be included within the scope of the present invention.Furthermore, all the coupling / linking relationships mentioned in the present invention do not refer solely to the direct joining of the elements, but rather to the fact that a more favorable coupling structure can be formed by adding or reducing coupling accessories depending on the specific implementation. The various technical features of the present invention can interact and combine without conflicting with one another.

[0024] With reference to [Fig. 1], an embodiment of the present invention provides a three-dimensional composite copper sheet for a solid-state lithium-ion battery, comprising a support layer 10, the support layer 10 being a porous film layer or a fibrous film layer. A first metallization layer 20 and a second metallization layer 30 are arranged on two sides of the support layer 10. A third metallization layer 40 is arranged on one side of the first metallization layer 20 opposite the support layer 10. A fourth metallization layer 50 is arranged on one side of the second metallization layer 30 opposite the support layer 10. A first conductive copper layer 60 is arranged on one side of the third metallization layer 40 opposite the first metallization layer 20.A second conductive copper layer 70 is disposed on one side of the fourth metallization layer 50 opposite the second metallization layer 30.

[0025] Thanks to the structure described above, the composite copper sheet according to the present invention comprises a support layer 10, which is a porous film layer or a fibrous film layer, and which serves to support the entire composite copper sheet, thus exhibiting characteristics of light weight, low cost, and good ductility. This makes it possible to reduce the weight of the composite copper sheet and the use of copper material, as well as the weight and manufacturing cost of the solid-state lithium-ion battery, and to improve the ductility of the composite copper sheet, so as to prevent damage or breakage caused by the expansion or contraction of the electrolyte during the charging and discharging of the solid-state lithium-ion battery; moreover, during the charging and discharging of the solid-state lithium-ion battery,The pores on the porous film layer or the pores on the fibrous film layer can act as a passage for the movement of lithium ions in the electrolyte, so that the lithium ions in the electrolyte of the solid-state lithium-ion battery can move rapidly from one side of the composite copper sheet to the other, thus improving the charging and discharging rate of the solid-state lithium-ion battery. The arrangement of the first conductive copper layer 60 and the second conductive copper layer 70, which have good electrical conductivity, is such that it can meet the requirements for load-bearing capacity and tensile strength of the composite copper sheets, thus meeting the performance requirements of the solid-state lithium-ion battery. The first metallization layer 20 is provided to insulate the first conductive copper layer 60 and the support layer 10.The second metallization layer 30 is designed to insulate the second conductive copper layer 70 from the support layer 10, thereby protecting the support layer 10. This prevents the support layer 10 from burning during high- and low-temperature cycling tests of solid-state lithium-ion batteries, thus improving the stability of the composite copper foil during the test process. The arrangement of the third metallization layer 40 improves adhesion between the first metallization layer 20 and the first conductive copper layer 60, preventing the first conductive copper layer 60 from detaching. Furthermore, the arrangement of the fourth metallization layer 50 improves adhesion between the second metallization layer 30 and the second conductive copper layer 70.in order to prevent the second conductive copper layer 70 from detaching.

[0026] In this embodiment, a first metallization layer 20 and a second metallization layer 30 are deposited on two sides of the support layer 10 by magnetron sputtering, vacuum evaporation, or chemical deposition; a third metallization layer 40 is deposited on one side of the first a metallization layer 20 opposite the support layer 10, by magnetron sputtering, vacuum evaporation or chemical deposition, and a fourth metallization layer 50 is disposed on one side of the second metallization layer 30 opposite the support layer 10, by magnetron sputtering, vacuum evaporation or chemical deposition; a first conductive copper layer 60 is disposed on one side of the third metallization layer 40 opposite the first metallization layer 20, by vacuum evaporation or electrodeposition, and a second conductive copper layer 70 is disposed on one side of the fourth metallization layer 50 opposite the second metallization layer 30, by vacuum evaporation or electrodeposition.

[0027] The porous film layer is a porous film layer made of PET (polyethylene terephthalate), a porous film layer made of PP (polypropylene), a porous film layer made of PI (polyimide), or a porous film layer made of PE (polyethylene). The low density of the PET porous film layer, the PP porous film layer, the PI porous film layer, and the PE porous film layer further reduces the weight of the composite copper sheet and the weight of the solid-state lithium-ion battery, and improves the ductility of the composite copper sheet, while also being easy to manufacture.

[0028] The fibrous film layer is a PET fibrous film layer, a PP fibrous film layer, a PI fibrous film layer, or a PE fibrous film layer. The low density of the PET fibrous film layer, the PP fibrous film layer, the PI fibrous film layer, and the PE fibrous film layer further reduces the weight of the composite copper sheet as well as the weight of the solid-state lithium-ion battery, and improves the ductility of the composite copper sheet, while also being easy to manufacture.

[0029] The pores of the porous film layer or the fibrous film layer have a pore size of 0.05 to 500 sqm and a porosity of 0.1% to 80%. These values ​​can ensure that lithium ions are able to pass through the pores, and metallic filling in the pores can be avoided when the first metallization layer 20 and the second metallization layer 30 are disposed of on two sides of the support layer 10, by magnetron sputtering, vacuum evaporation or chemical deposition.

[0030] The first metallization layer 20 and the second metallization layer 30 are both made of one of cobalt, aluminum, nickel, cadmium, magnesium, lithium, and manganese, or any combination thereof. The use of a combination of several metals can form a dense insulating layer.

[0031] The third metallization layer 40 and the fourth metallization layer 50 are all made of copper or copper alloy; the first conductive copper layer The first conductive copper layer 60 and the second conductive copper layer 70 are both made of copper; and the third metallization layer 40 and the fourth metallization layer 50 can be made of copper or a copper alloy. The arrangement of the first conductive copper layer 60 on the side of the third metallization layer 40 opposite the first metallization layer 20, and the arrangement of the second conductive copper layer 70 on the side of the fourth metallization layer 50 opposite the second metallization layer 30, by vacuum evaporation or electrodeposition, increases the rate at which the first conductive copper layer 60 and the second conductive copper layer 70 are generated.

[0032] The thickness of the support layer 10 is from 1 to 30 µm (microns), preferably 10 µm; the thickness of the first metallization layer 20 and that of the second metallization layer 30 are from 5 to 100 nm (nanometers), preferably 50 nm; the thickness of the third metallization layer 40 and that of the fourth metallization layer 50 are from 10 to 200 nm, preferably 100 nm; and the thickness of the first conductive copper layer 60 and that of the second conductive copper layer 70 are from 500 to 2,000 nm, preferably 1,000 nm. With the thicknesses, the total thickness of the composite copper sheet according to the present invention is therefore between 2.03 and 34.6 sqm, which is small enough to further reduce the weight of the composite copper sheet, and therefore the weight of the solid lithium-ion battery can be further reduced.

[0033] With reference to [Fig. 2], the present invention further provides a method for preparing a composite copper sheet for a solid-state lithium-ion battery based on the composite copper sheet described above for a solid-state lithium-ion battery, comprising the following steps:

[0034] IF: Provide a support layer 10. The width and length of the support layer 10 can be defined according to the actual situation. The thickness of the support layer 10 is from 1 to 30 sq m. The support layer 10 is a porous film layer or a fibrous film layer. The porous film layer is a PET porous film layer, a PP porous film layer, a PI porous film layer, or a PE porous film layer. The fibrous film layer is a PET fibrous film layer, a PP fibrous film layer, a PI fibrous film layer, or a PE fibrous film layer. The pores of the porous film layer or the fibrous film layer have a pore size of 0.05 to 500 sq m and a porosity of 0.1% to 80%.

[0035] S2: depositing a first metallization layer 20 and a second metallization layer 30 respectively on two sides of the support layer 10, by magnetron sputtering, vacuum evaporation, or chemical deposition. The first metallization layer 20 and the second metallization layer 30 are both composed of one of cobalt, aluminum, nickel, cadmium, magnesium, lithium and manganese, or any combination thereof. The thickness of the first metallization layer 20 and that of the second metallization layer 30 are from 5 to 100 nm.

[0036] S3: depositing a third metallization layer 40 on one side of the first metallization layer 20 opposite the support layer 10, and depositing a fourth metallization layer 50 on one side of the second metallization layer 30 opposite the support layer 10, by magnetron sputtering, vacuum evaporation, or chemical deposition. The third metallization layer 40 and the fourth metallization layer 50 are both made of copper or a copper alloy. The thickness of the third metallization layer 40 and that of the fourth metallization layer 50 are from 10 to 200 nm.

[0037] S4: a first conductive copper layer 60 is deposited on one side of the third metallization layer 40 opposite the first metallization layer 20, and a second conductive copper layer 70 is deposited on one side of the fourth metallization layer 50 opposite the second metallization layer 30, by vacuum evaporation or electrodeposition. The first conductive copper layer 60 and the second conductive copper layer 70 are both made of copper; and the thickness of the first conductive copper layer 60 and that of the second conductive copper layer 70 are from 500 to 2000 nm.

[0038] The preparation process according to the present invention has the advantages of a simple process and easy manufacture, and the resulting composite copper sheet is light and inexpensive, which makes it possible to reduce the weight and manufacturing cost of the solid lithium-ion battery, and to improve the charging and discharging speed of the solid lithium-ion battery, so as to greatly meet the demand for use.

[0039] The foregoing relates only to preferred embodiments of the present invention and is not intended to limit the present invention. A person skilled in the art may make equivalent changes and modifications without departing from the scope of the invention.

Claims

Demands

1. Three-dimensional composite copper foil for solid lithium-ion battery, characterized in that it comprises: a support layer (10), the support layer (10) being a porous film layer or a fibrous film layer, in which a first metallization layer (20) and a second metallization layer (30) are respectively disposed on two sides of the support layer (10), a third metallization layer (40) is disposed on one side of the first metallization layer (20) opposite the support layer (10), and a fourth metallization layer (50) is disposed on one side of the second metallization layer (30) opposite the support layer (10);a first conductive copper layer (60) is disposed on one side of the third metallization layer (40) opposite the first metallization layer (20), and a second conductive copper layer (70) is disposed on one side of the fourth metallization layer (50) opposite the second metallization layer (30).

2. Three-dimensional composite copper sheet for solid lithium-ion battery according to claim 1, characterized in that the porous film layer is a PET porous film layer, a PP porous film layer, a PI porous film layer or a PE porous film layer.

3. Three-dimensional composite copper sheet for solid lithium-ion battery according to claim 1, characterized in that the fibrous film layer is a PET fibrous film layer, a PP fibrous film layer, a PI fibrous film layer or a PE fibrous film layer.

4. Three-dimensional composite copper foil for solid-state lithium-ion battery according to claim 1, characterized in that the pores of the porous film layer or the fibrous film layer have a pore size of 0.05 to 500 pm and a porosity of 0.1% to 80%

5. / 0. Three-dimensional composite copper sheet for solid-state lithium-ion battery according to claim 1, characterized in that the first metallization layer (20) and the second metallization layer (30) are both made of one of cobalt, aluminium, nickel, cadmium, magnesium, lithium and manganese, or any combination thereof.

6. Three-dimensional composite copper sheet for solid lithium-ion battery according to claim 1, characterized in that the third metallization layer (40) and the fourth metallization layer (50) are both made of copper or a copper alloy.

7. Three-dimensional composite copper sheet for solid lithium-ion battery according to claim 1, characterized in that the thickness of the support layer (10) is from 1 to 30 sqm.

8. Three-dimensional composite copper foil for solid lithium-ion battery according to claim 1, characterized in that the thickness of the first metallization layer (20) and that of the second metallization layer (30) are both from 5 to 100 nm, and the thickness of the third metallization layer (40) and that of the fourth metallization layer (50) are both from 10 to 200 nm.

9. Three-dimensional composite copper sheet for solid lithium-ion battery according to claim 1, characterized in that the thickness of the first conductive copper layer (60) and that of the second conductive copper layer (70) are both from 500 to 2000 nm.

10. A method for preparing a three-dimensional composite copper sheet for a solid-state lithium-ion battery, characterized in that it comprises the following steps: S1: providing a support layer (10), the support layer (10) being a porous film layer or a fibrous film layer; S2: disposing of a first metallization layer (20) and a second metallization layer (30) respectively on two sides of the support layer (10), by magnetron sputtering, vacuum evaporation or chemical deposition; S3: disposing of a third metallization layer (40) on one side of the first metallization layer (20) opposite the support layer (10), and disposing of a fourth metallization layer (50) on one side of the second metallization layer (30) opposite the support layer (10), by magnetron sputtering, vacuum evaporation or chemical deposition; S4: place a first conductive copper layer (60) on one side of the third metallization layer (40) opposite the first metallization layer (20), and place a second conductive copper layer (70) on one side of the fourth metallization layer (50) opposite the second metallization layer, by vacuum evaporation or electrodeposition (30)

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