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KR-20260062192-A - CATHODE FOR METAL-AIR BATTERY COMPRISING ALKALINE EARTH METAL CARBONATES AND METAL-AIR BATTERY COMPRISING SAME

KR20260062192AKR 20260062192 AKR20260062192 AKR 20260062192AKR-20260062192-A

Abstract

A positive electrode for a metal-air battery comprising an alkaline earth metal carbonate and a metal-air battery comprising the same are disclosed. The present invention relates to a positive electrode for a metal-air battery comprising: a porous carbon material; and a catalyst comprising an alkaline earth metal carbonate embedded on the surface or inside of the porous carbon material. The present invention can provide a metal-air battery with improved performance by reducing the charge potential.

Inventors

  • 강정원

Assignees

  • 국립목포대학교산학협력단

Dates

Publication Date
20260507
Application Date
20241025

Claims (13)

  1. porous carbon material; and A catalyst comprising an alkaline earth metal carbonate embedded on the surface or inside the porous carbon material; Anode for a metal-air battery containing
  2. In paragraph 1, A positive electrode for a metal-air battery, characterized in that the above-mentioned porous carbon material comprises one or more selected from the group consisting of carbon paper, carbon felt, graphite felt, carbon fiber felt, carbon black, acetylene black, Ketjen black, activated carbon, carbon fiber, carbon nanotube, and graphene.
  3. In paragraph 2, A positive electrode for a metal-air battery characterized in that the above alkaline earth metal carbonate is represented by the following chemical formula 1. [Chemical Formula 1] MCO 3 In the above chemical formula 1, M is an alkaline earth metal.
  4. In paragraph 3, A positive electrode for a metal-air battery, characterized in that the alkaline earth metal comprises one or more selected from the group consisting of beryllium (Be), magnesium (Mg), calcium (Ca), strontium (Sr), barium (Ba), and radium (Ra).
  5. In paragraph 4, A positive electrode for a metal-air battery characterized in that the above alkaline earth metal includes calcium (Ca).
  6. The structure comprises an anode, a cathode, a separator located between the anode and the cathode, and an electrolyte. The above anode porous carbon material; and A metal-air battery comprising: a catalyst comprising an alkaline earth metal carbonate embedded on the surface or inside the porous carbon material.
  7. In paragraph 6, A positive electrode for a metal-air battery, characterized in that the above-mentioned porous carbon material comprises one or more selected from the group consisting of carbon paper, carbon cloth, carbon felt, graphite felt, carbon fiber felt, carbon black, acetylene black, Ketjen black, activated carbon, carbon fiber, carbon nanotube, and graphene.
  8. In paragraph 6, A metal-air battery characterized in that the above-mentioned negative electrode comprises one or more materials selected from the group consisting of lithium, zinc, aluminum, iron, magnesium, and their alloys.
  9. In paragraph 6, A metal-air battery characterized in that the separator comprises one or more materials selected from the group consisting of glass fiber, high-density polyethylene, low-density polyethylene, linear low-density polyethylene, ultra-high molecular weight polyethylene, polypropylene, polyethylene terephthalate, polybutylene terephthalate, polyester, polyacetal, polycarbonate, polyimide, polyamide, polyetherketone, polyethersulfone, polyphenylene oxide, polyphenylene sulfide, and polyethylenenaphthalene.
  10. In paragraph 6, The above electrolyte comprises a lithium salt and an organic solvent, and The above organic solvent comprises one or more selected from the group consisting of N,N-dimethylacetamide (DMAc), ethylene carbonate (EC), propylene carbonate (PC), 1,2-dioxane, and acetonitrile, and A metal-air battery characterized in that the lithium salt comprises one or more selected from the group consisting of LiNO3 , LiPF6 , LiBF4 , LiSbF6 , LiAsF6 , LiN( SO2C2F5 )2 , Li( CF3SO2 ) 2N , LiC4F9SO3, LiClO4 , LiAlO2 , LiAlCl4 , LiF , LiBr, LiCl, LiI , LiB( C2O4 ) 2 , LiCF3SO3 , LiN( SO2CF3 ) 2 (Li-TFSI), LiN( SO2C2F5 ) 2 , and LiC( SO2CF3 ) 3 .
  11. (a) a step of manufacturing an anode; and (b) a step of manufacturing a metal-air battery comprising the anode, metal cathode, separator, and electrolyte; comprising, The above anode porous carbon material; and A method for manufacturing a metal-air battery comprising: a catalyst comprising an alkaline earth metal carbonate embedded on the surface or inside of the porous carbon material.
  12. In Paragraph 11, Step (a) (a-1) A step of preparing a mixture comprising an alkaline earth metal carbonate precursor and a C2-C5 alkylene glycol; (a-2) a step of impregnating a carbon material into the mixture; and (a-3) A step of heat-treating a carbon material impregnated with the above mixture to produce an anode; characterized by a method for manufacturing a metal-air battery.
  13. In Paragraph 11, A method for manufacturing a metal-air battery characterized in that the heat treatment of step (a-3) is performed at 350 to 450 ℃.

Description

A cathode for metal-air battery comprising alkaline earth metal carbonates and metal-air battery comprising the same The present invention relates to an anode for a metal-air battery comprising an alkaline earth metal carbonate and a metal-air battery comprising the same. Current sustained interest in energy storage devices is driving the development of advanced next-generation batteries. Rechargeable lithium-oxygen (Li- O2 ) batteries have garnered attention as a viable alternative due to their high energy density (~3600 Whkg⁻¹ ). A typical Li- O2 battery consists of a Li anode, a separator, an aprotic electrolyte, and a porous air cathode. During discharge, oxygen in the air reacts with Li⁺ ions to produce lithium peroxide ( Li₂O₂ ) in combination with electrons from the cathode, whereas Li₂O₂ decomposes into Li and oxygen during charging. However, the insulating properties of Li₂O₂ cause it to accumulate on the cathode , creating a high energy barrier that hinders electron and ion transport , resulting in high resistance and consequently an increase in overpotential. To address this issue, efforts have been made to develop efficient electrocatalysts to improve the performance of Li- O2 batteries. Various catalysts developed include carbon-based materials, metal oxides/nitrides, and novel metals. However, most catalysts must be mixed with conductive additives and polymer binders to manufacture electrodes, which may not guarantee a uniform distribution. Furthermore, the presence of insulating polymer binders hinders the efficient diffusion and transport of ions and electrons. Therefore, the development of technology to improve the performance of Li- O2 batteries is required. These drawings are for reference to explain exemplary embodiments of the present invention, and therefore, the technical concept of the present invention should not be interpreted as being limited to the attached drawings. Figure 1 shows XPS survey scans of pristine P50 (Comparative Example 1) and the CaCO3 -supported P50 of the present invention (Example 1). Figure 2a shows the Ca 2p core level XPS spectra of CaCO 3 -supported P50 and CaCO 3 powder. Figure 2b shows the O 1 s XPS spectra of carbon containing CaCO3 , CaCO3 powder, and pristine P50. Figure 3 shows FE-TEM images of pristine P50 (a, b) and CaCO3 -supported P50 (c, d). Figures 4a to 4e show dark felt (a) and elemental mapping (b) images, and the corresponding elemental mapping images of CaCO3 -supported P50 for C (c), O (d) and Ca (e). Figures 5a and 5b show the first discharge/charge profile (a) measured at a current of 0.1mA for 5 hours (limited capacity: 0.5mAh) and the energy efficiency (b) for the corresponding cycle. Figures 5c and 5d show the first discharge/charge profile (c) measured at a current of 0.1 mA for 10 hours (limited capacity: 1 mAh) and the energy efficiency (d) for the corresponding cycle. Figure 6 shows the ex situ XRD patterns of the pristine state (a), the state after discharge (b), and the state after recharging (c) for a battery using CaCO3 -supported P50. Figure 7 shows SEM images of the discharge products of pristine P50 and CaCO3 -supported P50. Hereinafter, embodiments of the present invention will be described in detail with reference to the attached drawings so that those skilled in the art can easily implement the present invention. However, the following description is not intended to limit the present invention to specific embodiments, and detailed descriptions of related prior art are omitted if it is determined that such detailed descriptions could obscure the essence of the present invention. The terms used herein are merely for describing specific embodiments and are not intended to limit the invention. The singular notation includes the plural notation unless the context clearly indicates otherwise. In this application, terms such as “comprising” or “having” are intended to specify the presence of the features, numbers, steps, actions, components, or combinations thereof described in the specification, and should be understood as not precluding the existence or addition of one or more other features, numbers, steps, actions, components, or combinations thereof. Additionally, terms including ordinal numbers, such as "first," "second," etc., used below may be used to describe various components, but said components are not limited by said terms. These terms are used solely for the purpose of distinguishing one component from another. For example, without departing from the scope of the present invention, the first component may be named the second component, and similarly, the second component may be named the first component. Furthermore, when it is stated that a component is "formed" or "laminated" on another component, it should be understood that while it may be formed or laminated by being directly attached to the entire surface or one surface of the other component, there may also be other components present in between. Hereinaft