Hybrid supercapacitor current collector and hybrid supercapacitor

Abstract

The embodiment of the utility model discloses a hybrid super capacitor current collector and a hybrid super capacitor, the hybrid super capacitor current collector comprises a current collector body, and the front and back surfaces of the current collector body are provided with regularly arranged blind holes. Due to the blind holes, the specific surface area is greatly increased, and more active substances can be borne; the conical structure effectively prevents active substances from falling off, and the enhancement of cohesion can effectively improve the mechanical stability in the electrode material and prolong the service life of the battery.

Description

Technical Field

[0001] This utility model relates to the field of hybrid supercapacitor technology, and in particular to a hybrid supercapacitor current collector and a hybrid supercapacitor. Background Technology

[0002] Hybrid supercapacitors (HSCs) hold broad application prospects in electric vehicles, portable electronic devices, renewable energy systems (such as solar and wind energy storage), industrial equipment, and smart grids. As a bridge between batteries and traditional electric double-layer capacitors (EDLCs), HSCs combine the advantages of both, namely high energy density and power density. The current collector plays a crucial role in optimizing the performance of HSCs; the choice of current collector material and structural design have a profound impact on the electrochemical behavior, energy density, power density, and cycle stability of the entire system.

[0003] Current collectors are a crucial component of electrode materials, responsible not only for collecting and transferring charge to the external circuitry but also for providing mechanical support and structural stability. In hybrid supercapacitors, the choice of current collector directly impacts the electrode's conductivity, interfacial stability, and overall electrochemical performance.

[0004] Common current collector materials include copper-based and aluminum-based current collectors. Copper is prone to corrosion in acidic or alkaline electrolytes, which leads to a decrease in current collector performance and consequently affects the long-cycle stability of the battery. Aluminum is also prone to corrosion in alkaline electrolytes, and although it has good conductivity, its interfacial bonding with some pseudocapacitive materials is weak, affecting the adhesion and conductivity of the electrode materials.

[0005] Current collector technology plays a crucial role in the development of hybrid supercapacitors. Currently, research focuses on improving the conductivity, corrosion resistance, interfacial stability, and electrode material adhesion of current collectors through material selection, structural design, and surface modification. Future research will emphasize developing more corrosion-resistant, lightweight, and highly conductive current collectors to meet the growing demand for high-performance energy storage devices.

[0006] However, existing current collectors have the following problems:

[0007] 1. The interfacial resistance between the current collector and the electrode material is relatively high.

[0008] Traditional metal current collectors have relatively smooth surfaces, resulting in weak mechanical and chemical bonding with active electrode materials, which limits charge transport channels. Furthermore, the surface chemistry of metal current collectors may become mismatched with pseudocapacitive materials and battery-type electrode materials during prolonged use, affecting interfacial stability.

[0009] 2. Material weight issues

[0010] Traditional metal current collectors (such as copper and aluminum) have good electrical conductivity, but they are relatively heavy, especially copper, which has a high density. This is a significant disadvantage for energy storage devices used in portable devices or electric vehicles that require lightweight construction.

[0011] 3. Limitations of the current collector structure

[0012] Currently, most current collector designs still primarily use two-dimensional planar structures (such as copper foil and aluminum foil). Although the manufacturing process for this planar structure is mature, its specific surface area is low. The contact area between the current collector and the electrode material is limited in a two-dimensional structure, which restricts the loading capacity of the electrode material and fails to fully utilize the active sites of the electrode material. Utility Model Content

[0013] The technical problem to be solved by this utility model embodiment is to provide a hybrid supercapacitor current collector and a hybrid supercapacitor, so as to effectively improve the performance of the hybrid supercapacitor.

[0014] To address the aforementioned technical problems, this utility model proposes a hybrid supercapacitor current collector, comprising a current collector body, wherein both the front and back sides of the current collector body are provided with regularly arranged blind holes.

[0015] Furthermore, the blind hole is narrower at the top and wider at the bottom.

[0016] Furthermore, the blind hole is a tapered hole with an upper and lower diameter ratio of 0.65-0.9:1.

[0017] Furthermore, the ratio of the upper and lower apertures is 0.8:1.

[0018] Furthermore, the blind holes on both sides of the current collector body are arranged in a staggered manner.

[0019] Furthermore, the blind holes on both sides of the current collector body are arranged in a matrix.

[0020] Furthermore, the ratio of the depth of the blind hole to the thickness of the current collector body is 0.1-0.35:1.

[0021] Furthermore, the ratio of the depth of the blind hole to the thickness of the current collector body is 0.28:1.

[0022] Furthermore, the current collector body is made of stamped metal foil.

[0023] Accordingly, this utility model embodiment also provides a hybrid supercapacitor, including the hybrid supercapacitor current collector described above.

[0024] The beneficial effects of this invention are as follows: the blind holes significantly increase the specific surface area, allowing it to hold more active materials; the conical structure effectively prevents the active materials from falling off, and the enhanced cohesion can effectively improve the internal mechanical stability of the electrode material and extend battery life. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the structure of the hybrid supercapacitor current collector according to an embodiment of the present invention.

[0026] Figure 2 This is a cross-sectional schematic diagram of the current collector of the hybrid supercapacitor according to an embodiment of the present invention.

[0027] Explanation of icon numbers

[0028] The current collector body 10 has a blind hole 20, a blind hole 21 on the front, and a blind hole 22 on the back. Detailed Implementation

[0029] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of this application can be combined with each other. The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0030] In this embodiment of the invention, directional indicators (such as up, down, left, right, front, back, etc.) are only used to explain the relative positional relationship and movement of the components in a specific posture (as shown in the attached figure). If the specific posture changes, the directional indicators will also change accordingly.

[0031] Furthermore, in this utility model, descriptions involving "first," "second," etc., are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features.

[0032] Please refer to Figures 1-2 The hybrid supercapacitor current collector of this utility model embodiment includes a current collector body.

[0033] The current collector body has regularly arranged blind holes on both its front and back sides. The distribution of the blind holes on the front and back sides can be referenced... Figure 1 The blind holes significantly increase the specific surface area of ​​the current collector, allowing it to hold more active material. This invention solves the problems of high interfacial resistance between the current collector and electrode materials, high current collector density in the device, limitations in the current collector structure, low specific surface area, and weak bonding with active materials in current hybrid capacitors. This invention is easy to process, convenient to use, and can effectively improve the performance of hybrid supercapacitors.

[0034] In one implementation, the blind hole is narrower at the top and wider at the bottom. This wedge-shaped or conical recessed structure effectively prevents the loss of active material, and the increased cohesion can effectively improve the mechanical stability of the electrode material, thus extending battery life.

[0035] Preferably, the blind hole is a tapered hole with an upper and lower diameter ratio of 0.65-0.9:1. More preferably, the upper and lower diameter ratio is 0.8:1.

[0036] In one implementation, the blind holes on both sides of the current collector are arranged in an alternating pattern. This alternating arrangement ensures that the positions of the blind holes on both sides of the current collector are staggered, which can further increase the specific surface area.

[0037] In one implementation, the blind holes on both sides of the current collector body are arranged in a matrix.

[0038] In one implementation, the ratio of the depth of the blind hole to the thickness of the current collector body is 0.1-0.35:1. Preferably, the ratio of the depth of the blind hole to the thickness of the current collector body is 0.28:1.

[0039] In one implementation, the current collector body is formed by stamping metal foil, such as lead foil, aluminum foil, or copper foil.

[0040] The hybrid supercapacitor of this utility model embodiment includes a hybrid supercapacitor current collector.

[0041] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A hybrid supercapacitor current collector, comprising a current collector body, characterized in that, The current collector body has regularly arranged blind holes on both the front and back sides.

2. The hybrid supercapacitor current collector as described in claim 1, characterized in that, The blind hole is narrower at the top and wider at the bottom.

3. The hybrid supercapacitor current collector as described in claim 2, characterized in that, The blind hole is a tapered hole with an upper and lower diameter ratio of 0.65-0.9:

1.

4. The hybrid supercapacitor current collector as described in claim 3, characterized in that, The ratio of the upper and lower apertures is 0.8:

1.

5. The hybrid supercapacitor current collector as described in claim 1, characterized in that, The blind holes on both sides of the current collector body are arranged in a staggered manner.

6. The hybrid supercapacitor current collector as described in claim 1, characterized in that, The blind holes on both sides of the current collector body are arranged in a matrix.

7. The hybrid supercapacitor current collector as described in claim 1, characterized in that, The ratio of the depth of the blind hole to the thickness of the current collector body is 0.1-0.35:

1.

8. The hybrid supercapacitor current collector as described in claim 7, characterized in that, The ratio of the depth of the blind hole to the thickness of the current collector body is 0.28:

1.

9. The hybrid supercapacitor current collector as described in claim 1, characterized in that, The current collector body is made of stamped metal foil.

10. A hybrid supercapacitor, characterized in that, Includes the hybrid supercapacitor current collector as described in any one of claims 1-9.

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