KR-102961549-B1 - Electrode for secondary cell, method of fabricating the same and secondary cell

Abstract

An electrode for a secondary battery according to one aspect of the present invention comprises a current collector and an active material electrode layer formed on the current collector, wherein the current collector comprises a polymer body having a plurality of through pinholes formed therein and a metal plating layer formed on the upper surface, lower surface, and inside the plurality of through pinholes of the polymer body, and the active material electrode layer is formed on the metal plating layer of the current collector.

Inventors

• 엄지용
• 김종민
• 임안섭
• 김창수

Assignees

• 한국자동차연구원

Dates

Publication Date

20260507

Application Date

20240415

Claims (10)

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7. A step of forming a plurality of through pinholes in a polymer body; A step of forming a metal plating layer on the upper surface, lower surface, and inside the plurality of through pinholes of the polymer body to form a current collector having the metal plating layer formed thereon on the polymer body; and The method includes the step of forming an active material electrode layer on the metal plating layer of the above-mentioned current collector; and The above metal plating layer is, A first metal plating layer formed on the upper surface of the polymer body; A second metal plating layer formed on the lower surface of the polymer body; and It includes a third metal plating layer formed on the interior of the plurality of through pinholes and electrically connecting the first metal plating layer and the second metal plating layer, The formation of the above metal plating layer utilizes an electroless plating method, and The third metal plating layer is formed with a thickness greater than the radius of each of the plurality of through pinholes so as to completely fill the interior of the plurality of through pinholes without any empty space, and The step of forming the active material electrode layer is performed by pressing active material powders onto the current collector, and the active material electrode layer is formed on the first metal plating layer but is not formed inside the plurality of through pinholes. Method for manufacturing an electrode for a secondary battery.
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Description

Electrode for secondary cell, method of fabricating the same and secondary cell The present invention relates to a battery, and more specifically, to an electrode for a secondary battery, a method for manufacturing the same, and a secondary battery using the electrode. Rechargeable batteries are used to supply power to various devices, including portable electronic devices such as mobile phones, digital cameras, and laptops, as well as hybrid and electric vehicles. For example, lithium-ion batteries are adopted as power sources for portable devices, electric vehicles, and power storage due to their high energy density and ease of design, and research on high-energy-density lithium-ion battery materials capable of long-term use is expanding. Recently, lithium-ion batteries require higher performance capabilities than before, such as high energy density, eco-friendliness, and low cost, to facilitate the commercialization of electric vehicles. Consequently, various technologies are being developed to meet these needs. Conventional copper current collectors pose a problem of corrosion caused by hydrogen sulfide when used in all-solid-state batteries. Therefore, there is a demand for current collectors that are lightweight and possess high energy density per unit weight to replace existing copper current collectors and enhance the competitiveness of lithium-ion batteries. As shown in the Japanese patent below, a current collector technology is disclosed that applies a plastic current collector and forms a conductive layer to achieve weight reduction, but in such a current collector, electricity flows only through the surface and cannot flow through the interior of the current collector, so it is difficult to increase capacity through a stack. FIG. 1 is a cross-sectional view schematically showing an electrode for a secondary battery according to one embodiment of the present invention. FIG. 2 is a cross-sectional view schematically showing a secondary battery according to one embodiment of the present invention. FIG. 3 is a flowchart schematically illustrating a method for manufacturing an electrode for a secondary battery according to one embodiment of the present invention. FIGS. 4 to 6 are cross-sectional views schematically illustrating a method for manufacturing an electrode for a secondary battery according to one embodiment of the present invention. Figure 7 is a graph showing the cycle characteristics of a secondary battery according to a comparative example and an example. Hereinafter, several preferred embodiments of the present invention will be described in detail with reference to the attached drawings. The embodiments of the present invention are provided to more fully explain the invention to those skilled in the art, and the following embodiments may be modified in various different forms, and the scope of the invention is not limited to the following embodiments. Rather, these embodiments are provided to make the disclosure more faithful and complete and to fully convey the spirit of the invention to those skilled in the art. In addition, the thickness or size of each layer in the drawings is exaggerated for convenience and clarity of explanation. FIG. 1 is a cross-sectional view schematically showing an electrode (110) for a secondary battery according to one embodiment of the present invention. Referring to FIG. 1, the electrode (110) for a secondary battery may include a current collector (112) and an active material electrode layer (118). The current collector (112) may include a polymer body (113) and a metal plating layer (116). The active material electrode layer (118) may be formed on the current collector (112). More specifically, the current collector (112) may utilize a polymer body (113) for weight reduction. However, since the polymer body (113) is an insulator, the current collector (112) may be constructed by forming a metal plating layer (116) on the polymer body (113) to function as a charge collector. The polymer body (113) may be formed from a lightweight polymer material, such as PET. Furthermore, a plurality of through pinholes (114) may be formed in the polymer body (113). A plurality of through pinholes (114) may be formed at predetermined intervals to penetrate the polymer body (113) vertically. For example, each of the through pinholes (114) may be formed to penetrate from the upper surface to the lower surface of the polymer body (113). A metal plating layer (116) may be formed on the surface of a polymer body (113). For example, the metal plating layer (116) may be formed on the upper surface, lower surface, and inside the through pinholes (114) of the polymer body (113). More specifically, the metal plating layer (116) may include a first metal plating layer (116a) formed on the upper surface of the polymer body (113), a second metal plating layer (116b) formed on the lower surface of the polymer body (113), and a third metal plating layer (116c) formed inside the thr