US-12620652-B2 - Electrode structure, electrode structure for positive electrode of metal-air battery comprising same, and methods for manufacturing same

Abstract

An electrode structure for a positive electrode of a metal-air battery is provided. The electrode structure for a positive electrode of a metal-air battery is formed of a compound of copper, phosphorus, and sulfur and it can comprise a membrane in which a plurality of fibrillated fibers form a network.

Inventors

• Jung-Ho Lee
• Sambhaji Shivaji Shinde
• Dong-hyung KIM

Assignees

• FLEXOLYTE

Dates

Publication Date

20260505

Application Date

20210222

Priority Date

20200220

Claims (8)

1. 1 . An electrode structure, comprising: a membrane formed of a plurality of fibers, the membrane comprising a compound of copper, phosphorus, and sulfur, wherein the compound has an orthorhombic crystal structure with a crystal plane ( 101 ), and wherein a peak value corresponding to the crystal plane ( 101 ) of the compound has a maximum value compared with a peak value corresponding to another crystal plane of the compound, as determined by XRD analysis.
2. 2 . The electrode structure of claim 1 , wherein the peak value corresponding to the crystal plane ( 101 ) is observed in a range of 2θ values of 19° to 21°.
3. 3 . A metal-air battery, comprising: a positive electrode including the electrode structure of claim 1 and using oxygen as a positive electrode active material; a negative electrode on the positive electrode; and an electrolyte between the positive electrode and the negative electrode.
4. 4 . The metal-air battery of claim 3 , wherein a lattice spacing is 0.466 nm as determined by HRTEM analysis of the membrane of the electrode structure in a discharged state of the metal-air battery.
5. 5 . The metal-air battery of claim 3 , wherein a lattice spacing is 0.478 nm as determined by HRTEM analysis of the membrane of the electrode structure in a charged state of the metal-air battery.
6. 6 . The metal-air battery of claim 3 , wherein a reference peak is observed in a range of 2θ values of 18.5° to 19.5° as determined by XRD analysis of the membrane of the electrode structure, and 2θ value at which the reference peak is observed is gradually decreased in a range of 2θ values of 19° to 21° as the metal-air battery is charged from a discharged state.
7. 7 . The metal-air battery of claim 6 , wherein the reference peak is divided into two as the metal-air battery is charged from the discharged state.
8. 8 . The metal-air battery of claim 3 , wherein the phosphorus has an oxidation number of 2 − in a discharged state of the metal-air battery, and the phosphorus has an oxidation number of 2 − and n − (2<n<3) in a charged state of the metal-air battery.

Description

CROSS REFERENCE TO RELATED APPLICATION This application is the National Stage of International Application PCT/KR2021/002215 (filed 22 Feb. 2021), which claims the benefit of Republic of Korea Patent Application 10-2020-0021252 (filed 20 Feb. 2020), Republic of Korean Patent Application 10-2020-0021253 (filed 20 Feb. 2020), Republic of Korean Patent Application 10-2020-0021894 (filed 21 Feb. 2020), Republic of Korea Patent Application 10-2020-0164654 (filed 30 Nov. 2020), and Republic of Korea Patent Application 10-2020-0164655 (filed 30 Nov. 2020). The entire contents of all of these priority applications is hereby incorporated by reference herein. BACKGROUND OF THE INVENTION 1. Field of the Invention The present application relates to an electrode structure and a method of fabricating the same, and more particularly, to an electrode structure including a membrane formed of a plurality of fibers, an electrode structure for a positive electrode of a metal-air battery including the same, and a fabrication method thereof. 2. Description of the Prior Art As mid-to-large high-energy applications such as electric vehicles and energy storage systems (ESS) are rapidly growing beyond the existing secondary batteries for small devices and home appliances, the market value of the secondary battery industry was only about 22 billion dollars in 2018, but is expected to grow to about 118 billion dollars by 2025. As such, in order for secondary batteries to be used as medium and large-sized energy storage media, price competitiveness, energy density and stability that are significantly improved more than a current level are required. According to the technical needs, various electrodes for secondary batteries have been developed. For example, Korean Unexamined Patent Publication No. 10-2019-0139586 discloses an electrode for a lithium-air battery, which includes a carbon nanotube and RuO2 deposited on a surface of the carbon nanotube, in which the RuO2 is deposited on a defective surface site of the carbon nanotube; the RuO2 has a particle size of 1.0 to 4.0 nm; and the RuO2 inhibits carbon decomposition at a surface defect site of the carbon nanotube and promotes the decomposition of Li2O2 formed on the surface of the carbon nanotube. SUMMARY OF THE INVENTION One technical object of the present application is to provide an electrode structure and a method of fabricating the same. Another technical object of the present application is to provide an electrode structure with low fabrication costs and a simple fabrication process, and a method of fabricating the same. Still another technical object of the present application is to provide an electrode structure with enhanced ORR, OER, and HER properties, and a method of fabricating the same. Still another technical object of the present application is to provide an electrode structure with long life and high stability, and a method of fabricating the same. Still another technical object of the present application is to provide an electrode structure for a positive electrode of a metal-air battery, and a method of fabricating the same. Still another technical object of the present application is to provide an electrode structure for a positive electrode of a metal-air battery with low fabrication costs and a simple fabrication process, and a method of fabricating the same. Still another technical object of the present application is to provide an electrode structure for a positive electrode of a metal-air battery with enhanced ORR, OER, and HER properties, and a method of fabricating the same. Still another technical object of the present application is to provide an electrode structure for a positive electrode of a metal-air battery with long life and high stability, and a method of fabricating the same. The technical objects of the present application are not limited to the above. To solve the above technical objects, the present application may provide an electrode structure. According to one embodiment, the electrode structure may include: a compound of a transition metal, phosphorus and a chalcogen element, in which a peak value corresponding to a crystal plane 101 has a maximum value compared with a peak value corresponding to another crystal plane as a result of XRD analysis; and a membrane formed of a plurality of fibers. According to one embodiment, a peak value corresponding to the crystal plane 101 may be observed in a range of 2θ values of 19° to 21°. According to one embodiment, the transition metal may include at least any one of copper, magnesium, manganese, cobalt, iron, nickel, titanium, zinc, aluminum, or tin, and the chalcogen element may include at least one of sulfur, oxygen, selenium, or tellurium. To solve the above technical objects, the present application may provide an electrode structure for a positive electrode of a metal-air battery. According to one embodiment, in the electrode structure for a positive electrode of a metal-air battery, the elec