TWI615864B - Conductive foil having a nanomaterial and method of manufacturing the same, and wound capacitor package structure - Google Patents

Abstract

The present invention discloses a conductive foil having a nano material and a method of fabricating the same, and a wound capacitor package structure using a conductive foil having a nano material. The conductive foil having a nano material includes a metal base structure and a composite nano material structure. The composite nano material structure is disposed on the metal base structure. The composite nano material structure is made of a graphite material, a part of the graphite material is converted into a graphene layer, and the rest of the graphite material forms a graphite layer disposed between the metal base layer structure and the graphene layer, and the composite layer The nano material structure is composed of a graphite layer and a graphene layer. Thereby, the impedance of the conductive foil is lowered and the overall electrical performance of the wound capacitor package structure using the conductive foil having a nano material is improved.

Description

Conductive foil with nano material and manufacturing method thereof, and wound capacitor seal Structure

The present invention relates to a conductive foil and a method of fabricating the same, and a capacitor package structure, and more particularly to a conductive foil having a nano material and a method of fabricating the same, and a wound capacitor package structure using a conductive foil having a nano material .

Capacitors have been widely used in consumer appliances, computer motherboards, power supplies, communication products and automotive basic components, the main functions of which include filtering, bypassing, rectification, coupling, decoupling, phase inversion, etc. One of the indispensable components in electronic products. Capacitors are available in different materials depending on the material and application, including aluminum electrolytic capacitors, tantalum electrolytic capacitors, multilayer ceramic capacitors, wound or stacked solid electrolytic capacitors, and thin film capacitors. In the prior art, a wound type solid electrolytic capacitor includes a capacitor element, a housing member, and a sealing member. The capacitor element winds an anode foil connected to the anode terminal and a cathode foil connected to the cathode terminal via an insulating member. The housing member has an opening and can accommodate the capacitor element. The sealing member has a through hole through which the anode terminal and the cathode terminal are inserted, and a sealing portion that can seal the receiving member. However, in order to lower the impedance of the anode foil and the cathode foil and to improve the electrical properties of the existing wound solid electrolytic capacitor, the anode foil and the cathode foil of the wound solid electrolyte capacitor have room for improvement.

The technical problem to be solved by the present invention is to provide for the deficiencies of the prior art. A conductive foil having a nano material and a method of fabricating the same, and a wound capacitor package structure using a conductive foil having a nano material.

In order to solve the above technical problem, one of the technical solutions adopted by the present invention is to provide a conductive foil having a nano material, comprising: a metal base layer structure and a composite nano material structure. The composite nanomaterial structure is disposed on the metal base structure. Wherein the composite nanomaterial structure is made of a graphite material, a part of the graphite material is converted into a graphene layer, and the remaining portion of the graphite material is formed in the metal base layer structure and a graphite layer between the graphene layers, and the composite nanomaterial structure is composed of the graphite layer and the graphene layer.

In order to solve the above technical problem, another technical solution adopted by the present invention is to provide a method for fabricating a conductive foil having a nano material, comprising the steps of: first, providing a metal base layer structure; and then forming a graphite material. On the metal substrate structure; then, a composite nano material structure is formed on the metal substrate structure. Wherein the composite nanomaterial structure is made of a graphite material, a part of the graphite material is converted into a graphene layer, and the remaining portion of the graphite material is formed in the metal base layer structure and a graphite layer between the graphene layers, and the composite nanomaterial structure is composed of the graphite layer and the graphene layer.

In order to solve the above technical problem, another technical solution adopted by the present invention is to provide a wound capacitor package structure including: a wound capacitor, a package, and at least two conductive pins. The wound capacitor includes at least two conductive foils and two release papers. Each of the conductive foils includes a metal base layer structure and a composite nano material structure disposed on the metal base layer structure. One of the two of the release sheets is disposed between at least two of the conductive foils. The package covers the entire wound capacitor. The at least two conductive pins are respectively electrically connected to the at least two conductive foils, wherein each of the conductive pins has an electrical connection to the corresponding conductive foil and is covered by the package The embedded portion and an exposed portion that is connected to the embedded portion and exposed to the outside of the package. Wherein the composite nanomaterial structure is made of a graphite material, a part of the graphite material is converted into a graphene layer, and the remaining portion of the graphite material is formed in the metal base layer structure and a graphite layer between the graphene layers, and the composite nanomaterial structure is composed of the graphite layer and the graphene layer.

Further, the metal base layer structure includes a metal base layer and an oxide layer completely covering the metal base layer, and the graphite layer of the composite nano material structure is disposed in the oxidation of the metal base layer structure The conductive foil comprising the metal base layer structure and the composite nano material structure can be used as a positive foil of a wound capacitor.

Further, the metal base layer structure is a metal base layer having a surface without an oxide layer, and the graphite layer of the composite nano material structure is disposed on the metal base layer of the metal base layer structure, and includes The conductive foil of the metal base structure and the composite nano material structure can be used as a negative foil of a wound capacitor.

Further, the metal base layer structure includes a metal base layer, an oxide layer completely covering the metal base layer, and a metal compound layer disposed on the oxide layer, and the composite nano material structure The graphite layer is disposed on the metal-organic compound layer of the metal-based layer structure, and the conductive foil including the metal-based layer structure and the composite nano-material structure can be used as a wound capacitor A positive foil is used.

Further, the metal base layer structure includes a metal base layer having a surface oxide-free layer and a metal compound layer disposed on the metal base layer structure, and the graphite layer of the composite nano material structure is disposed at the The conductive metal foil having the metal base layer structure and the composite nano material structure can be used as a negative foil of a wound capacitor.

The beneficial effects of the present invention are the conductive foil with a nano material provided by the technical solution of the present invention and a manufacturing method thereof, and a wound capacitor package structure, which can be converted into a graphene layer by "a part of the graphite material And the remaining portion of the graphite material forms a graphite layer disposed between the metal base layer structure and the graphene layer" and "the graphite layer and the graphene layer constitute a metal base layer A technical feature of a structural composite nanomaterial structure" to reduce the impedance of the conductive foil and to enhance the overall electrical performance of the wound capacitor package structure.

For a better understanding of the features and technical aspects of the present invention, reference should be made to the accompanying drawings.

Z‧‧‧Wind capacitor package structure

B‧‧‧Package

L‧‧‧conductive pin

L1‧‧‧ embedded department

L2‧‧‧Exposed Department

C‧‧‧Wind capacitor

F‧‧‧conductive foil

1‧‧‧Metal base structure

10‧‧‧ metal base

11‧‧‧Oxide layer

12‧‧‧Metal metal compound layer

2‧‧‧Composite nanomaterial structure

20‧‧‧Graphite materials

21‧‧‧graphene layer

22‧‧‧ graphite layer

P‧‧‧Isolation paper

1 is a flow chart showing a method of fabricating a conductive foil according to first to fourth embodiments of the present invention.

2 is a schematic view showing a step S100 (A) of a method of manufacturing a conductive foil according to a first embodiment of the present invention.

3 is a schematic view showing a step S102 of a method of manufacturing a conductive foil according to a first embodiment of the present invention.

Figure 4 is a schematic view of a conductive foil of a first embodiment of the present invention.

FIG. 5 is a schematic view of another conductive foil disclosed in the first embodiment of the present invention.

Fig. 6 is a schematic view showing a step S100 (B) of a method of manufacturing a conductive foil according to a second embodiment of the present invention.

FIG. 7 is a schematic view showing a step S102 of a method of manufacturing a conductive foil according to a second embodiment of the present invention.

Figure 8 is a schematic view of a conductive foil in accordance with a second embodiment of the present invention.

FIG. 9 is a schematic view of another conductive foil disclosed in a second embodiment of the present invention.

Figure 10 is a schematic view showing a step S100 (C) of a method of manufacturing a conductive foil according to a third embodiment of the present invention.

Figure 11 is a schematic view showing a step S102 of a method of fabricating a conductive foil according to a third embodiment of the present invention.

Figure 12 is a schematic view of a conductive foil according to a third embodiment of the present invention.

FIG. 13 is a schematic view of another conductive foil disclosed in a third embodiment of the present invention.

Figure 14 is a schematic view showing a step S100 (D) of a method of fabricating a conductive foil according to a fourth embodiment of the present invention.

Figure 15 is a schematic view showing a step S102 of a method of fabricating a conductive foil according to a fourth embodiment of the present invention.

Figure 16 is a schematic view of a conductive foil in accordance with a fourth embodiment of the present invention.

Figure 17 is a schematic view of another conductive foil disclosed in a fourth embodiment of the present invention.

Fig. 18 is a perspective view showing the packaged capacitor structure of the fifth embodiment of the present invention without covering the package.

Figure 19 is a side elevational view showing a packaged capacitor package structure according to a fifth embodiment of the present invention.

The following is a description of an embodiment of the present invention relating to "a conductive foil having a nano material and a method for fabricating the same, and a wound capacitor package structure" by a specific embodiment, which can be disclosed by those skilled in the art. The contents understand the advantages and effects of the present invention. The present invention may be carried out or applied in various other specific embodiments, and various modifications and changes can be made without departing from the spirit and scope of the invention. In addition, the drawings of the present invention are merely illustrative and are not intended to be construed in terms of actual dimensions. The following embodiments will further explain the related technical content of the present invention, but the disclosure is not intended to limit the scope of the present invention. For the contents of each paragraph disclosed in the following embodiments, please refer to FIG. 1 to FIG. 19 together.

[First Embodiment]

Referring to FIG. 1 to FIG. 4, a first embodiment of the present invention provides a The manufacturing method of the conductive foil F of the rice material comprises the following steps. First, as shown in FIG. 1 and FIG. 2, a metal base layer structure 1 is provided. The metal base layer structure 1 comprises a metal base layer 10 and a completely coated metal base layer 1 The oxide layer 11 (step S100 (A)); then, as shown in FIG. 1 and FIG. 3, a graphite material 20 is formed on the metal substrate structure 1 (step S102). For example, the graphite material 20 may be under vacuum and Formed under the condition of introducing an inert gas; then, as shown in FIG. 1, FIG. 3 and FIG. 4, a part of the graphite material 20 (that is, the outermost layer region of the graphite material 20) is passed through a redox method of introducing a reducing gas or Other methods are converted (or converted) into a graphene layer 21, and the remaining portion of the graphite material 20 forms a graphite layer 22 disposed between the metal substrate structure 1 and the graphene layer 21 (step S104), wherein the graphite layer 22 and the graphene layer 21 constitute a composite nanomaterial structure 2 disposed on the metal substrate structure 1.

Therefore, with reference to FIG. 1 and FIG. 4, the first embodiment of the present invention can provide a conductive foil F having a nano material, which includes: a method by the steps S100 (A), step S102, and step S104. The metal base structure 1 and a composite nano material structure 2. In addition, the composite nano material structure 2 is made of a graphite material 20, and a part of the graphite material 20 is converted into (or converted into) a graphene layer 21 by a redox method or a method of introducing a reducing gas. The remaining portion of the graphite material 20 forms a graphite layer 22 disposed between the metal base layer structure 1 and the graphene layer 21, and the composite nanomaterial structure 2 is composed of the graphite layer 22 and the graphene layer 21.

Furthermore, as shown in FIG. 4 and FIG. 18, the metal base structure 1 includes a metal base layer 10 and an oxide layer 11 completely covering the metal base layer 1, and the graphite layer 22 of the composite nano material structure 2 is disposed on the metal. The oxide layer 11 of the base structure 1 and the conductive foil F comprising the metal base structure 1 and the composite nano material structure 2 can be used as a positive foil of a wound capacitor C.

It is worth mentioning that, as shown in FIG. 5, the first embodiment of the present invention can also provide two composite nano material structures 2, and two composite nano material structures 2 They are respectively disposed on the opposite surfaces of the metal base structure 1.

It is worth noting that the nano material used in the composite nanomaterial structure 2 is not limited. Therefore, the composite nano material structure 2 can be a nanographene or a carbon nanotube.

[Second embodiment]

Referring to FIG. 1 and FIG. 6 to FIG. 8 , a second embodiment of the present invention provides a method for fabricating a conductive foil F having a nano material, which includes the following steps: First, as shown in FIG. 1 and FIG. A metal base layer structure 1 is provided, and the metal base layer structure 1 is a metal base layer 10 having a surface without an oxide layer (step S100 (B)); then, as shown in FIG. 1 and FIG. 7, a graphite material 20 is formed on the metal base layer structure 1 Upper (step S102), for example, the graphite material 20 may be formed under vacuum and with an inert gas; then, in conjunction with FIGS. 1, 7, and 8, a portion of the graphite material 20 (ie, graphite) The outermost region of the material 20 is converted (or converted) into a graphene layer 21 by a redox method or other method of introducing a reducing gas, and the remaining portion of the graphite material 20 is formed in the metal base layer structure 1 and graphene. The graphite layer 22 between the layers 21 (step S104), wherein the graphite layer 22 and the graphene layer 21 constitute a composite nanomaterial structure 2 disposed on the metal substrate structure 1.

Therefore, with reference to FIG. 1 and FIG. 8 , the second embodiment of the present invention can provide a conductive foil F having a nano material, which includes: a method by the steps S100 (B), S102, and S104. The metal base structure 1 and a composite nano material structure 2. In addition, the composite nano material structure 2 is made of a graphite material 20, and a part of the graphite material 20 is converted into (or converted into) a graphene layer 21 by a redox method or a method of introducing a reducing gas. The remaining portion of the graphite material 20 forms a graphite layer 22 disposed between the metal base layer structure 1 and the graphene layer 21, and the composite nanomaterial structure 2 is composed of the graphite layer 22 and the graphene layer 21.

Furthermore, as shown in FIG. 8 and FIG. 18, the metal base layer structure 1 is a metal base layer 10 having a surface without an oxide layer, and the graphite layer 22 of the composite nano material structure 2 is disposed on the metal base layer 10 of the metal base layer structure 1. The conductive foil F comprising the metal base layer structure 1 and the composite nano material structure 2 can be used as a negative foil of a wound capacitor C.

It is worth mentioning that, as shown in FIG. 9, the second embodiment of the present invention can also provide two composite nano material structures 2 at the same time, and two composite nano material structures 2 are respectively disposed in the metal base structure 1 On the opposite surface of the two.

[Third embodiment]

Referring to FIG. 1 and FIG. 10 to FIG. 12, a third embodiment of the present invention provides a method for fabricating a conductive foil F having a nano material, which includes the following steps: First, as shown in FIG. 1 and FIG. Providing a metal base layer structure 1, the metal base layer structure 1 includes a metal base layer 10, an oxide layer 11 completely covering the metal base layer 10, and a metal compound layer 12 disposed on the oxide layer 11 (step S100 (C)); Next, as shown in FIG. 1 and FIG. 11, a graphite material 20 is formed on the metal substrate structure 1 (step S102). For example, the graphite material 20 can be formed under vacuum and an inert gas; 1, 11 and 12, a part of the graphite material 20 (that is, the outermost region of the graphite material 20) is converted (or converted) into a graphite by a redox method or other method of introducing a reducing gas. The olefin layer 21, the remaining portion of the graphite material 20 forms a graphite layer 22 disposed between the metal base layer structure 1 and the graphene layer 21 (step S104), wherein the graphite layer 22 and the graphene layer 21 constitute a metal base layer structure Composite nanomaterial structure 2 on 1.

Thereby, the third embodiment of the present invention can provide a conductive foil F having a nano material, comprising: a metal base layer structure 1 and a composite type nai through the manufacturing method of step S100 (C), step S102, and step S104. Rice material structure 2. In addition, the composite nano material structure 2 is made of a graphite material 20, of which the graphite material 20 The middle portion is converted (or converted) into a graphene layer 21 by a redox method or other method of introducing a reducing gas, and the remaining portion of the graphite material 20 is formed between the metal base layer structure 1 and the graphene layer 21 The graphite layer 22 and the composite nanomaterial structure 2 are composed of a graphite layer 22 and a graphene layer 21.

Further, as shown in FIG. 12 and FIG. 18, the metal base layer structure 1 includes a metal base layer 10, an oxide layer 11 completely covering the metal base layer 10, and a metal compound layer 12 disposed on the oxide layer 11, The graphite layer 22 of the composite nano material structure 2 is disposed on the metal compound layer 12 of the metal base structure 1, and the conductive foil F including the metal base structure 1 and the composite nano material structure 2 can be wound A positive foil of type capacitor C is used.

It is worth mentioning that, as shown in FIG. 13, the metal base layer structure 1 of the third embodiment of the present invention can also provide another metal compound layer 12 disposed on the oxide layer 11. In addition, the third embodiment of the present invention can also provide two composite nano material structures 2 at the same time, and two composite nano material structures 2 are respectively disposed on opposite surfaces of the metal base structure 1.

[Fourth embodiment]

Referring to FIG. 1 and FIG. 14 to FIG. 16 , a fourth embodiment of the present invention provides a method for fabricating a conductive foil F having a nano material, which includes the following steps: First, as shown in FIG. 1 and FIG. A metal base layer structure 1 is provided. The metal base layer structure 1 includes a metal base layer 10 having a surface oxide-free layer and a metal compound layer 12 disposed on the metal base layer 10 (step S100 (D)); and then, with FIG. 1 and As shown in FIG. 15, a graphite material 20 is formed on the metal substrate structure 1 (step S102). For example, the graphite material 20 can be formed under vacuum and an inert gas; and then, FIG. 1, FIG. 15 and FIG. As shown in Fig. 16, a portion of the graphite material 20 (i.e., the outermost region of the graphite material 20) is converted (or converted) into a graphene layer 21 by a redox method or other method of introducing a reducing gas, and the graphite material 20 The remaining portion is formed in a metal substrate structure 1 and a graphene layer A graphite layer 22 between 21 (step S104), wherein the graphite layer 22 and the graphene layer 21 constitute a composite nanomaterial structure 2 disposed on the metal substrate structure 1.

Therefore, with reference to FIG. 1 and FIG. 16 , the fourth embodiment of the present invention can provide a conductive foil F having a nano material, which includes: a method by the steps S100 (D), step S102, and step S104. The metal base structure 1 and a composite nano material structure 2. In addition, the composite nano material structure 2 is made of a graphite material 20, and a part of the graphite material 20 is converted into (or converted into) a graphene layer 21 by a redox method or a method of introducing a reducing gas. The remaining portion of the graphite material 20 forms a graphite layer 22 disposed between the metal base layer structure 1 and the graphene layer 21, and the composite nanomaterial structure 2 is composed of the graphite layer 22 and the graphene layer 21.

Furthermore, as shown in FIG. 16 and FIG. 18, the metal base structure 1 includes a metal base layer 10 having no surface oxide layer and a metal compound layer 12 disposed on the metal base layer 10, and the composite nano material structure 2 The graphite layer 22 is disposed on the intermetallic compound layer 12 of the metal base layer structure 1, and the conductive foil F including the metal base layer structure 1 and the composite nano material structure 2 can be used as a negative foil of a wound capacitor C use.

It is worth mentioning that, as shown in FIG. 17, the metal base layer structure 1 of the fourth embodiment of the present invention can also provide another metal compound layer 12 disposed on the metal base layer 10. In addition, the fourth embodiment of the present invention can also provide two composite nano material structures 2 at the same time, and two composite nano material structures 2 are respectively disposed on opposite surfaces of the metal base structure 1.

[Fifth Embodiment]

As shown in FIG. 18 and FIG. 19, a fourth embodiment of the present invention provides a wound capacitor package structure Z including: a wound capacitor C, a package B, and at least two conductive pins L, and The wound capacitor C includes at least two conductive foils F and two release papers P.

Furthermore, with reference to any of the embodiments of FIG. 4, FIG. 5, FIG. 8, FIG. 9, FIG. 12, FIG. 13, FIG. 16 and FIG. 17, and FIG. 18, each of the conductive foils F includes a metal. The base structure 1 and a composite nanomaterial structure 2 disposed on the metal substrate structure 1 and one of the two separators P is disposed between the at least two conductive foils F. For example, the composite nanomaterial structure 2 is made of a graphite material 20, and a part of the graphite material 20 (that is, the outermost region of the graphite material 20) is passed through a redox method of introducing a reducing gas or other methods. Converted into (or converted into) a graphene layer 21, the remainder of the graphite material 20 forms a graphite layer 22 disposed between the metal substrate structure 1 and the graphene layer 21, and the composite nanomaterial structure 2 is composed of a graphite layer 22 and a graphene layer 21 are formed.

Further, as shown in FIGS. 18 and 19, the package B covers the entire wound capacitor C. In addition, at least two conductive pins L are electrically connected to the at least two conductive foils F, and each of the conductive pins L has an electrical connection to the corresponding conductive foil F and is covered by the package B. The buried portion L1 and an exposed portion L2 that is connected to the embedded portion L1 and exposed to the outside of the package B.

Accordingly, the fourth embodiment of the present invention discloses a wound capacitor package structure Z using a conductive foil F having a nano material, which can be converted into a graphene layer 21 by a part of the graphite material 20, and the graphite material 20 The remaining portion forms a graphite layer 22" disposed between the metal substrate structure 1 and the graphene layer 21" and "the graphite layer 22 and the graphene layer 21 constitute a composite nanomaterial structure 2 disposed on the metal substrate structure 1. Technical characteristics to reduce the impedance of the conductive foil F and improve the overall electrical performance of the wound capacitor package structure Z, wherein the electrical properties include: increasing the dielectric constant, improving the conductivity, improving the thermal stability, and increasing the polymer impregnation rate. Increase Capacitance (Cap), Reduce Equivalent Series Resistance (ESR), Reduce Dissipation Factor (DF), and Reduce Leakage Current (LC).

[Advantageous Effects of Embodiments]

The beneficial effects of the present invention are the conductive foil F having a nano material and the manufacturing method thereof, and the wound capacitor package structure Z, which can pass the "part of the graphite material 20 (that is, graphite). The outermost region of the material 20 is converted (or converted) into a graphene layer 21, and the remainder of the graphite material 20 forms a graphite layer 22" and "graphite" disposed between the metal substrate structure 1 and the graphene layer 21 The layer 22 and the graphene layer 21 constitute a technical feature of a composite nanomaterial structure 2" disposed on the metal substrate structure 1 to reduce the impedance of the conductive foil F and improve the overall electrical performance of the wound capacitor package structure Z, Among them, electrical properties include: increasing dielectric constant, improving conductivity, improving thermal stability, increasing polymer impregnation rate, increasing capacitance (Capacitance, Cap), reducing Equivalent Series Resistance (ESR), and reducing loss factor. (Dissipation Factor, DF) and Leakage Current (LC) and so on.

The above disclosure is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention. Therefore, any equivalent technical changes made by using the present specification and the contents of the drawings are included in the application of the present invention. Within the scope of the patent.

The specified representative diagram is a flow chart, so no symbolic simple explanation

Claims (5)

A conductive foil having a nano material, comprising: a metal base layer structure; and a composite nano material structure, wherein the composite nano material structure is disposed on the metal base layer structure; wherein the composite type The rice material structure is made of a graphite material, a part of which is converted into a graphene layer, and the remaining portion of the graphite material forms a graphite disposed between the metal base layer structure and the graphene layer a layer, wherein the composite nanomaterial structure is composed of the graphite layer and the graphene layer; wherein the metal base layer structure comprises a metal base layer having a surface oxide-free layer and a metal base layer structure disposed thereon a mesometallic compound layer thereon, and the graphite layer of the composite nano material structure is disposed on the metal compound layer of the metal base layer structure. The conductive foil having a nano material according to claim 1, wherein the conductive foil comprising the metal base layer structure and the composite nano material structure can be used as a negative foil of a wound capacitor. use. A method for fabricating a conductive foil having a nano material, comprising the steps of: providing a metal base layer structure; forming a graphite material on the metal base layer structure; and converting a portion of the graphite material into a graphene layer, The remaining portion of the graphite material forms a graphite layer disposed between the metal substrate structure and the graphene layer, wherein the graphite layer and the graphene layer form a structure disposed on the metal substrate structure a composite nanomaterial structure; wherein the metal base structure comprises a metal base layer having no surface oxide layer and a metal compound layer disposed on the metal base layer structure, and the composite nano material structure is a graphite layer disposed on the metal base layer structure On the intermetallic compound layer. A wound capacitor package structure comprising: a wound capacitor comprising: at least two conductive foils, each of the conductive foils comprising a metal base layer structure and a metal base layer disposed thereon a composite composite nanomaterial structure; and two release papers, one of the two release papers being disposed between at least two of the conductive foils; and a package covering the entire package The winding type capacitor; and at least two conductive pins, at least two of the conductive pins are electrically connected to the at least two conductive foils respectively, wherein each of the conductive pins has an electrical connection corresponding to The conductive foil and the embedded portion covered by the package body and an exposed portion connected to the buried portion and exposed outside the package body; wherein the composite nano material structure Made of a graphite material, a part of the graphite material is converted into a graphene layer, and the remaining portion of the graphite material forms a stone disposed between the metal base layer structure and the graphene layer a layer, wherein the composite nanomaterial structure is composed of the graphite layer and the graphene layer; wherein the metal base layer structure comprises a metal base layer having a surface oxide-free layer and a metal base layer structure disposed thereon a mesometallic compound layer thereon, and the graphite layer of the composite nano material structure is disposed on the metal compound layer of the metal base layer structure. The wound capacitor package structure according to claim 4, wherein the conductive foil including the metal base layer structure and the composite nano material structure can be used as a negative foil of a wound capacitor. .