KR-20260066962-A - ALL-SOLID-STATE THERMALLAY CHARGEABLE HYDRID SUPERCAPACITOR AND MANUFACTURING METHOD THEREFOR

Abstract

The present invention relates to a thermal charging hybrid supercapacitor and a method for manufacturing the same, and provides an all-solid-state self-thermal charging hybrid supercapacitor comprising a layered double-structure oxidation electrode, a carbon-based reduction electrode, and a solid electrolyte, and a method for manufacturing the same. The thermal charging hybrid supercapacitor and the method for manufacturing the same according to the present invention can increase charge/discharge efficiency by maximizing the oxidation reaction occurring at the oxidation electrode and reducing the interfacial resistance between the aqueous solid electrolyte and the reduction electrode.

Inventors

• 강석원
• 조영우
• 소민서
• 김범준

Assignees

• 영남대학교 산학협력단

Dates

Publication Date

20260512

Application Date

20241105

Claims (5)

1. All-solid self-thermal-charging hybrid supercapacitor comprising a layered double-structure oxidation electrode, a carbon-based reduction electrode, and a solid electrolyte.
2. In claim 1, A thermally charged hybrid supercapacitor in which the solid electrolyte comprises polystyrene sulfonic acid and D-sorbitol.
3. In claim 1, A thermally charged hybrid supercapacitor in which the oxide electrode of the above-described layered double structure is NiMn-LDH@Ni 3 S 2 .
4. In claim 1, A thermally charged hybrid supercapacitor in which the above-mentioned carbon-based reduction electrode has been treated with oxygen plasma.
5. A method for manufacturing a thermally charged hybrid supercapacitor comprising: a step of hydrothermally reacting a nickel substrate with a mixture containing a solvent, a transition metal chloride, and a nitrogen compound to form a layered double-structured transition metal compound on the nickel substrate, and reacting the layered double-structured transition metal compound with a sulfide and a nickel chloride to produce a layered double-structured oxidation electrode coated with nickel sulfide; a step of mixing a composition containing activated carbon, a binder, a solvent, and an additive, applying it to a current collector, and curing the applied composition to produce a carbon-based reduction electrode; a step of preparing a solid electrolyte by heat-stirring and drying a mixture containing a conductive polymer; and a step of placing the solid electrolyte between the layered double-structured oxidation electrode and the carbon-based reduction electrode.

Description

All-solid-state self-thermally charged hybrid supercapacitor and manufacturing method thereof The present invention relates to an all-solid-state self-heat-charging hybrid supercapacitor and a method for manufacturing the same. The Soret effect is a principle in which a temperature gradient changes the ion concentration gradient, causing ions to move and generate a potential difference to produce electricity. The basic operating principle is that a temperature difference creates an ion concentration gradient, and ions move along that gradient. At this time, H + ions within the electrolyte, which have relatively high mobility, accumulate on the cold side; consequently, electrons emitted from the layered double-layered oxidation electrode move to the carbon-based reduction electrode and become negatively charged. In the case of anions, relatively compared to H + Due to low mobility, it forms an electric double layer on the hot side. Electricity can be generated due to this difference in ion movement. This has the advantage of producing more power with a small temperature difference, as it has a Seebeck coefficient 3 to 5 times higher than the conventional Seebeck effect. The Soret effect generates electricity by utilizing the movement of ions rather than electrons, converting the chemical potential difference generated in this process into electrical energy. It is particularly efficient in systems using liquid or solid electrolytes and enables effective power production even at low temperature differences, making it a sustainable and eco-friendly method of energy generation. This technology has great potential to contribute to sustainable energy production as it can generate electricity using various heat sources, such as geothermal, solar, and waste heat. Energy generation devices based on the Solett effect complement existing thermoelectric technology and can evolve to maximize the utilization of low-temperature heat sources. Conventional supercapacitors required an external power supply for charging and discharging, and had the disadvantage of being difficult to apply in various thermoelectric effects, including the Seebeck effect, due to low efficiency. FIG. 1 is a schematic diagram of a thermal charging capacitor of the present invention. Figure 2 is an image showing the charging and discharging mechanism due to the Solett effect. (a) is a diagram of the initial state, (b) is a state with a temperature gradient applied, (c) is a charging state, and (d) is a diagram of the discharging state. Figure 3 is a diagram showing the layered double hydroxide structure of the NiMn-LDH@ Ni3S2 electrode on the hot side. Figure 4 is a diagram showing (a) a carbon-based electrode without separate treatment and (b) a carbon-based electrode that has been hydrophilized through oxygen plasma treatment. Figure 5 relates to a method for manufacturing a hot-side NiMn-LDH@ Ni3S2 electrode . Figure 6 relates to a method for manufacturing a carbon-based electrode on the cold side. FIG. 7 relates to a method for manufacturing a solid electrolyte according to one embodiment of the present invention. A solid electrolyte is an electrolyte that generates the Soret effect and forms electrical energy from a temperature difference. For the solid electrolyte to form electrical energy, a temperature difference is absolutely necessary. The solid electrolyte must be located between a hot side and a cold side, and the thermal charging capacitor of the present invention operates due to the temperature difference between them. The above solid electrolyte may be a solid electrolyte based on the Soret effect. A solid electrolyte based on the Soret effect generates electrical energy by utilizing an ion gradient formed by a temperature gradient. In other words, the temperature gradient can be considered a type of voltage inducer. When a temperature gradient is formed, ions move to form a voltage, and subsequently, discharge is performed by consuming the formed electrical energy (voltage). The present embodiment will be described below with reference to the attached drawings. FIG. 1 is a schematic diagram of a thermal charging capacitor according to one embodiment of the present invention. A layered double-structure oxidation electrode is provided on the hot side and a carbon-based reduction electrode is provided on the cold side, and a solid electrolyte is disposed between the oxidation electrode and the reduction electrode to form an all-solid-state self-thermal charging hybrid supercapacitor. FIG. 2 is a diagram showing the charging and discharging mechanism by the Soret effect of a thermal charging capacitor according to an embodiment of the present invention. Referring to FIG. 2(a), it can be seen that ions exist randomly in the initial state. Referring to FIG. 2(b), which shows the state with a temperature gradient applied, it can be seen that ions move due to the Soret effect when a temperature gradient is applied to both sides of the capaci