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KR-20260062182-A - CATHODE FOR A METAL-AIR BATTERY COMPRISING A TRANSITION METAL PHOSPHIDE AND A METAL-AIR BATTERY COMPRISING SAME

KR20260062182AKR 20260062182 AKR20260062182 AKR 20260062182AKR-20260062182-A

Abstract

A positive electrode for a metal-air battery comprising a transition metal phosphide 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 a transition metal phosphide. 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 (14)

  1. porous carbon material; and A catalyst comprising transition metal phosphides; 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 nanotubes, carbon fibers, graphene, carbon black, acetylene black, Ketjen black, activated carbon, carbon paper, carbon felt, graphite felt, and carbon fiber felt.
  3. In paragraph 1, A cathode for a metal-air battery characterized in that the carbon nanotube comprises one or more types selected from the group consisting of multi-walled carbon nanotubes, double-walled carbon nanotubes, and single-walled carbon nanotubes.
  4. In paragraph 1, A positive electrode for a metal-air battery characterized in that the above transition metal phosphide is represented by the following chemical formula 1. [Chemical Formula 1] M x P y In the above chemical formula 1, M is a transition metal, and x is 0<x≤3, and y is 0 < y ≤ 4.
  5. In paragraph 4, A positive electrode for a metal-air battery, characterized in that the transition metal is selected from the group consisting of Ni, Sc, Ti, V, Cr, Mn, Fe, Co, Cu, and Zn.
  6. In paragraph 1, A positive electrode for a metal-air battery characterized in that the above transition metal phosphide includes Ni₂P .
  7. 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 a transition metal phosphide.
  8. In Paragraph 7, A metal-air battery characterized in that the porous carbon material comprises one or more selected from the group consisting of carbon nanotubes, carbon fibers, graphene, carbon black, acetylene black, Ketjen black, activated carbon, carbon paper, carbon felt, graphite felt, and carbon fiber felt.
  9. In Paragraph 7, 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.
  10. In Paragraph 7, 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 polyethylene naphthalene.
  11. In Paragraph 7, 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 .
  12. (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 a transition metal phosphide.
  13. In Paragraph 12, Step (a) (a-1) A step of preparing a mixture comprising a transition metal phosphide, a porous carbon material, and a C1-C5 alkyl alcohol; (a-2) a step of dispersing the above mixture by ultrasonic treatment; and (a-3) A step of filtering and drying the dispersed mixture to produce an anode; characterized by a method for manufacturing a metal-air battery.
  14. In Paragraph 13, A method for manufacturing a metal-air battery characterized in that the drying of step (a-3) is performed at room temperature.

Description

A cathode for a metal-air battery comprising a transition metal phosphide and a metal-air battery comprising the same The present invention relates to an anode for a metal-air battery comprising a transition metal phosphide 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 the XRD patterns of MWCNT/Ni 2 P(a), Ni 2 P(b) and MWCNT(c) of the present invention. Figure 2 shows Fe-SEM images of pristine Ni 2 P (a, b), MWCNT (c, d), and MWCNT/Ni 2 P (e, f) of the present invention. Figure 3 shows the EDS elemental mapping analysis of the corresponding individual elements for MWCNT/Ni 2 P(a) and C(b), O(C), Ni(d) and P(e). Figure 4 shows the first discharge/charge graph (a) and cycle performance (b) of a battery using MWCNT and MWCNT/Ni 2 P. Figure 5 shows the electrochemical impedance spectroscopy (EIS) of MWCNT and MWCNT/Ni 2 P. Figures 6a and 6b show the ex-situ XRD patterns of the discharge and charge states of MWCNT(a) and MWCNT/Ni 2 P(b). Figure 6c shows the XRD pattern of the discharge state of crystallized P50 and MWCNT. Figure 7 shows SEM images of discharge products ( Li₂O₂ ) of MWCNT (a, b, c) and MWCNT/ Ni₂P (d, e, f ) . Figure 8 shows the ex-situ EDS elemental mapping analysis of the discharge state of the MWCNT anode for a Li- O2 battery. Figure 9 shows the ex-situ EDS elemental mapping analysis of the discharge state of the MWCNT/Ni 2P anode for a Li-O 2 battery. 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. Hereinafter, the positive electrode for a metal-air battery comprising a transition metal phosphide according to the