KR-20260063377-A - Hybrid supercapacitor using heterogeneous transition metal sulfides and its manufacturing method

Abstract

The present invention relates to a hybrid supercapacitor using a heterostructured transition metal sulfide, and more specifically, to a high-performance hybrid supercapacitor having high specific energy and stability in energy storage by providing an anode in which a heterostructured transition metal sulfide is deposited on an electrode substrate and a cathode in which marine organism-based activated carbon is used. Furthermore, the present invention relates to a method for manufacturing a hybrid supercapacitor using a transition metal sulfide of a heterostructure. More specifically, the invention relates to a method for manufacturing a high-performance hybrid supercapacitor having a large capacitance and high energy density by forming a heterostructure by depositing a transition metal hydroxide precursor and a transition metal oxide precursor on an electrode substrate using a hydrothermal synthesis method, and manufacturing an anode with improved electrical conductivity by forming an interface between an amorphous and a crystalline structure through sulfidation treatment.

Inventors

• 김병철
• 이영주
• 최양호
• 남지은
• 김묘신
• 장선진

Assignees

• 국립순천대학교산학협력단

Dates

Publication Date

20260507

Application Date

20241030

Claims (5)

1. An anode having a heterostructured transition metal sulfide deposited on an electrode substrate; A cathode composed of activated carbon; and A hybrid supercapacitor using a transition metal sulfide of a heterostructure containing an electrolyte that is an aqueous solution.
2. In Article 1, A hybrid supercapacitor using a transition metal sulfide of a heterostructure, characterized in that the transition metal sulfide has a heterostructure of cobalt molybdenum sulfide-nickel sulfide ( CoMoS₄ - NiS₂ ), and an interface exists between an amorphous region and a crystalline region in the heterostructure.
3. In Article 1, A hybrid supercapacitor using a heterostructured transition metal sulfide, characterized in that the electrode substrate used is a three-dimensional electrode substrate selected from the group consisting of carbon fiber cloth (CFC), graphene foam (GF), and nickel foam (NF).
4. A step of forming a single-structure transition metal layer by depositing a transition metal hydroxide precursor on an electrode substrate; A step of forming a heterostructured transition metal layer by depositing a transition metal oxide precursor on the above-mentioned single-structured transition metal layer; A step of manufacturing an anode in which a transition metal sulfide layer of a heterogeneous structure is formed on the electrode substrate by sulfidating the transition metal layer of the heterogeneous structure above; A step of manufacturing a cathode using activated carbon produced by processing carbon components separated by freeze-drying and heat-treating marine organisms; and A method for manufacturing a hybrid supercapacitor using a heterostructured transition metal sulfide, characterized by including the step of manufacturing a hybrid supercapacitor having an ion-permeable membrane that absorbs an electrolyte between the anode and cathode.
5. In Paragraph 4, A method for manufacturing a hybrid supercapacitor using a heterostructured transition metal sulfide, characterized in that the time at which the transition metal oxide precursor is deposited on the single-structured transition metal layer by hydrothermal synthesis is within 6 to 18 hours.

Description

Hybrid supercapacitor using heterogeneous transition metal sulfides and its manufacturing method The present invention relates to a hybrid supercapacitor using a heterostructured transition metal sulfide, and more specifically, to a high-performance hybrid supercapacitor having high specific energy and stability in energy storage by comprising an anode in which a heterostructured transition metal sulfide is deposited on an electrode substrate and a cathode in which marine organism-based activated carbon is used. Furthermore, the present invention relates to a method for manufacturing a hybrid supercapacitor using a transition metal sulfide of a heterostructure. More specifically, the invention relates to a method for manufacturing a high-performance hybrid supercapacitor having a large capacitance and high energy density by forming a heterostructure by depositing a transition metal hydroxide precursor and a transition metal oxide precursor on an electrode substrate using a hydrothermal synthesis method, and manufacturing an anode with improved electrical conductivity by forming an interface between an amorphous and a crystalline structure through sulfidation treatment. Recently, as the electric vehicle market expands, interest in high-efficiency energy storage systems, such as capacitors and secondary batteries which are the primary power sources for electric vehicles, is growing simultaneously. Among these, a capacitor is a device that stores electrical capacitance as electrical potential energy in an electric circuit. To date, detailed development of capacitors is underway through various studies, including super capacitors (SC) and hybrid capacitors (HC). In particular, supercapacitors are attracting attention in the market for products requiring high power consumption, such as hybrid electric vehicles, due to their fast charging speeds and high power output density. However, supercapacitors have a major disadvantage in that their energy density is relatively low compared to rechargeable batteries. As it charges quickly, it discharges easily, causing the inconvenience of having to charge the vehicle frequently when used in an electric vehicle. This is related to the mechanism by which the capacitor operates. A supercapacitor has a structure in which an electrolyte exists between two electrodes, a positive electrode and a negative electrode. When a voltage is applied between the two electrodes, positive ions move to the negative electrode and negative ions move to the positive electrode, attaching to the electrodes. In this case, as the electrode area increases, the degree to which ions can attach also increases, so the capacitance of the capacitor can be increased; however, since the energy density decreases, the efficiency drops significantly. To address this, it is necessary to develop supercapacitors capable of increasing capacitance and specific energy while maintaining high electrical conductivity and fast response speeds. Accordingly, the development of Hybrid Super Capacitors (HSCs) with high energy density is underway by adopting the principles of secondary batteries such as lithium-ion batteries; however, since the disadvantage of secondary batteries having low power density still appears in Hybrid Super Capacitors, research is being conducted to address this issue. According to recent research, transition metal sulfides (TMSs) are gaining attention as a component of the anode in hybrid supercapacitors. This is because transition metal sulfides have the advantage of increasing the power density of hybrid supercapacitors based on their high electrochemical activity and excellent redox reversibility. However, since these transition metal sulfides have low ionic conductivity, using them as anodes slows down the reaction rate and reduces the durability of hybrid supercapacitors, so a solution to this problem needs to be presented. FIG. 1 (a) is a drawing illustrating a hybrid supercapacitor according to an embodiment of the present invention. Figure 1(b) is a diagram showing the positive and negative electrodes of a hybrid supercapacitor according to an embodiment of the present invention. Figure 2 is a graph showing potential values measured during the manufacturing process of the positive electrode of a hybrid supercapacitor according to an embodiment of the present invention. Figure 3(a) is a graph showing the capacity per unit area according to current density when a transition metal oxide precursor is deposited on a single-structure transition metal layer by hydrothermal synthesis for 6 hours. Figure 3(b) is a graph showing the capacity per area according to current density when a transition metal oxide precursor is deposited on a single-structure transition metal layer by hydrothermal synthesis for 12 hours. Figure 3 (c) is a graph showing the capacity per area according to current density when a transition metal oxide precursor is deposited on a single-structure transition metal layer by hydr