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KR-102963597-B1 - Method of manufacturing lithium-ion capacitors that can reduce the load of cathode current collector and lithium-ion capacitor manufactured thereby

KR102963597B1KR 102963597 B1KR102963597 B1KR 102963597B1KR-102963597-B1

Abstract

The present invention provides a method for manufacturing a lithium-ion capacitor, comprising an electrode cell manufacturing step including a press process and a punching process, and an anode forming step including a step of forming an anode active layer comprising different types of activated carbon having different capacities on an anode current collector, wherein the press process and the punching process are performed by a roll-to-roll method. According to the method, electrode damage caused by the press process or the punching process can be prevented.

Inventors

  • 김현덕
  • 김광석
  • 전세진
  • 김현우
  • 엄준혁
  • 김진성

Assignees

  • 비나텍 주식회사

Dates

Publication Date
20260513
Application Date
20240726

Claims (5)

  1. The electrode cell manufacturing step, comprising a press process and a stamping process, includes a positive electrode active layer formed on a positive electrode current collector, wherein the positive electrode active layer is formed such that the positive electrode active layer is composed of a first activated carbon and a second activated carbon having the same weight as the first activated carbon and a capacity 3 to 10% greater than the capacity of the first activated carbon, and includes a positive electrode formation step. The above press process and stamping process are carried out by a roll-to-roll method, and The rolling rate of the press process for the anode during the above press process is 7 to 8%, and A method capable of preventing the anode current collector from being torn by a load applied to the anode current collector. Method for manufacturing a lithium-ion capacitor.
  2. In paragraph 1, A method for manufacturing a lithium-ion capacitor characterized in that the positive current collector comprises an aluminum through-foil.
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Description

Method of manufacturing lithium-ion capacitors that can reduce the load of cathode current collector and lithium-ion capacitor manufactured thereby The present invention relates to a technology in the field of capacitor manufacturing, specifically to a lithium-ion capacitor manufacturing technology capable of reducing defects during the manufacturing process of a lithium-ion capacitor by reducing the load on the positive current collector. A lithium-ion capacitor (LIC) is a hybrid energy storage device that combines the advantages of an electric double layer capacitor (EDLC) and a lithium-ion battery (LIB). The positive electrode (+) of an LIC uses a carbon material such as activated carbon and stores energy electrostatically by forming an electric double layer, similar to an EDLC. The negative electrode (-) uses a carbon material pre-doped with lithium ions and stores energy electrochemically through the insertion and extraction of lithium ions, similar to a LIB. Since these LICs have a higher energy density than EDLCs, they can store more energy and generally have an energy density of about 10-25 Wh/kg. They enable rapid charging and discharging, allowing for instantaneous high power output. In addition, they have a long lifespan comparable to EDLCs, resulting in minimal performance degradation even with repeated charging and discharging, and can generally withstand more than 10,000 charge-discharge cycles. In terms of operating temperature range, they can operate stably over a wide temperature range of -25℃ to 85℃. In the manufacturing process of lithium-ion capacitors, through-hole aluminum foil is primarily used as the positive current collector; however, due to its weak mechanical strength, through-hole aluminum foil is susceptible to deformation and breakage. To prevent this, increasing electrode density can be considered; however, increasing electrode density places a load on the current collector, causing the electrode to tear easily and consequently reducing production yield. FIGS. 1 to 6 are perspective views illustrated to explain a method for manufacturing a lithium-ion capacitor according to one embodiment of the present invention. FIG. 7 is a cross-sectional view of a lithium-ion capacitor according to one embodiment of the present invention. Hereinafter, a method for manufacturing a lithium-ion capacitor according to an embodiment of the present invention will be described in detail with reference to the attached drawings. In addition, an embodiment of the manufactured lithium-ion capacitor will be described. The following descriptions are exemplary descriptions intended to explain the embodied aspects of the technical concept of the present invention, and the technical concept of the present invention is not limited by the following descriptions. The technical concept of the present invention may be interpreted and limited only by the claims set forth below. Meanwhile, the thickness and shape of the components of the lithium-ion capacitor depicted in the drawing are examples for conceptual explanation, and the shape and scale of the lithium-ion capacitor actually manufactured may vary, and the possibility of various modifications to the lithium-ion capacitor of the present invention is not limited by the appearance in the drawing. FIGS. 1 to 6 are perspective views illustrated to explain a method for manufacturing a lithium-ion capacitor according to one embodiment of the present invention. Referring to FIG. 1, in order to manufacture a lithium-ion capacitor (100), a lithium thin film (114) is first formed on one side of a separator (113). Here, the separator (113) performs the role of electrically separating the negative electrode (112) and the positive electrode (111), which will be described later, from each other. The separator (113) includes a porous material for the movement of ions, and examples of the material of the separator (113) include paper, nonwoven fabric, and cellulose-based resin, but the material of the separator (113) in this embodiment is not particularly limited. The lithium thin film (114) can serve as a source for supplying lithium ions to the cathode (112) to be described later. Here, the lithium thin film (114) can be formed through a vacuum deposition method. At this time, the lithium thin film (114) may have a thickness range of 1 to 10 μm. Here, if the lithium thin film is less than 1 μm, not only is the amount of lithium to be doped into the cathode (112) too small, but the contact resistance between the cathode active material layer (112b) and the lithium thin film (114) may increase, so the pre-doping process may not be performed properly. On the other hand, if it exceeds 10 μm, the lithium thin film (114) may remain on the separator (113) after the pre-doping process is performed on the cathode (112). Here, the thickness of the lithium thin film (114) is not limited and can be varied depending on the material or thickness of the cathode (112) material. Refer