Lithium-air battery catalyst having 1d polycrystalline tube structure of ruthenium oxide - manganese oxide complex, and manufacturing method thereof

Patent metadata

Field	Value
Publication number	US-2017331120-A1
Application number	US-201615527733-A
Country	US
Kind code	A1
Filing date	Jul 4, 2016
Priority date	Jul 6, 2015
Publication date	Nov 16, 2017
Grant date	—

Abstract

A lithium-air battery catalyst having a 1D polycrystalline tubes structure of a ruthenium oxide-manganese oxide complex includes the ruthenium oxide-manganese oxide complex having at least one polycrystalline tubes structure among a core fiber-shell patterned nanotubes structure and a double walls patterned composite double tubes structure, and the ruthenium oxide-manganese oxide complex is formed as an air electrode catalyst.

First claim

What is claimed is:

1 . A lithium-air battery catalyst having a 1D polycrystalline tubes structure of a ruthenium oxide-manganese oxide complex, the lithium-air battery catalyst comprising:
the ruthenium oxide-manganese oxide complex having at least one polycrystalline tubes structure of a core fiber-shell patterned nanotubes structure and a double walls patterned composite double tubes structure, wherein the ruthenium oxide-manganese oxide complex forms an air electrode.

2 . The lithium-air battery catalyst of claim 1 , wherein a ruthenium oxide of the ruthenium oxide-manganese oxide complex is RuO 2 .

3 . The lithium-air battery catalyst of claim 1 , wherein a manganese oxide of the ruthenium oxide-manganese oxide complex is at least one or more of Mn 2 O 3 and MnO 2 .

4 . The lithium-air battery catalyst of claim 1 , wherein the core fiber-shell patterned nanotubes structure comprises a nanotubes structure in which a core is placed with a ruthenium oxide in a nanofiber structure, a shell is placed with a manganese oxide in a tube patterned shell structure, and the core and the shell are separated each other through an air gap.

5 . The lithium-air battery catalyst of claim 1 , wherein the core fiber-shell patterned nanotubes structure comprises a structure in which core fibers are locally mixed with shells due to ununiform distribution of air gaps between the core fibers and the shells.

6 . The lithium-air battery catalyst of claim 1 , wherein the core fiber-shell patterned nanotubes structure comprises core nanofibers having diameters ranged from 10 to 500 nm, and the nanotubes forming shells have diameters ranged from 15 to 1,000 nm.

7 . The lithium-air battery catalyst of claim 1 , wherein the double walls patterned composite double tubes structure comprises a core fiber and a shell, which are undistinguished, without phase separation in a double walls pattern formed of an inner tube and an outer tube that are uniformly complexed with a mixture of a ruthenium oxide and a manganese oxide.

8 . The lithium-air battery catalyst of claim 1 , wherein the double walls patterned composite double tubes structure comprises an air gap between an inner wall and an outer wall, wherein the tubes are respectively separated each other through the air gap in an interval from 5 to 500 nm or the inner and outer walls have a local part that is present without separation.

9 . The lithium-air battery catalyst of claim 1 , wherein the double walls patterned composite double tubes structure comprises a double walls pattern of an inner tube and an outer tube, the inner tube has a diameter ranged from 10 to 500 nm, and the outer tube has a diameter ranged from 15 to 1,000 nm.

10 . The lithium-air battery catalyst of claim 1 , wherein a thickness of an outer wall of a shell of the core fiber-shell patterned nanotubes structure and thicknesses of inner and outer walls of the double walls patterned composite double tubes structure are ranged from 1 to 100 nm.

11 . A manufacturing method of a lithium-air battery catalyst having a 1D polycrystalline tubes structure of a ruthenium oxide-manganese oxide complex, the manufacturing method comprising:
manufacturing an electrospinning solution by dissolving ruthenium precursors and manganese precursors in a solvent where a polymer is dissolved; synthesizing polymer complex nanofibers, which include the ruthenium precursors and the manganese precursors, from the electrospinning solution by using an electrospinning process; forming a ruthenium oxide-manganese oxide complex, which has the polycrystalline tubes structure, by treating the polymer complex nanofibers at high temperature; and forming slurry by using the ruthenium oxide-manganese oxide complex, and forming a lithium-air battery catalyst by forming an air electrode through a casting from the slurry.

12 . The manufacturing method of claim 11 , wherein the forming of the ruthenium oxide-manganese oxide complex comprises:
forming the ruthenium oxide-manganese oxide complex, which has the polycrystalline tubes structure, by selecting at least one of a core fiber-shell patterned nanotubes structure, which is thermally treated in a low heating rate, and a double walls patterned composite double tubes structure, which is thermally treated in a high heating rate, during high temperature thermal treatment.

13 . The manufacturing method of claim 12 , wherein the forming of the lithium-air battery catalyst comprises:
selecting at least one or more of the core fiber-shell patterned nanotubes structure and the double walls patterned composite double tubes structure, mixing the ruthenium oxide-manganese oxide complex with a conductive material, which includes at least one or more of Ketjen black, graphene, and carbon nanotubes, and an adhesive material including at least one or more of polyvinylidene fluoride (PVdF), styrene-butadiene rubber (SBR)/carboxymethyl cellulose (CMC), and polytetrafluoroethylene (PTFE), and forming the air electrode by coating the mixture on a current collector; and forming the lithium-air battery catalyst including a gas diffusion layer, a membrane, an electrolyte, the air electrode, and a lithium anode.

14 . The manufacturing method of claim 11 , wherein the manufacturing of the electrospinning solution comprises:
selecting a relative weight ratio between the ruthenium precursors and the manganese precursors in a range from 50:50 to 10:90.

15 . The manufacturing method of claim 11 , wherein the manufacturing of the electrospinning solution comprises:
using different solvents selected from a group, which includes one or more of dimethylformamide (DMF), phenol, acetone, toluene, tetrahydrofuran, distilled water, ethanol, methanol, propanol, butanol, isopropanol, and alcohols, in a range from 10:90 to 90:10 as a weight ratio between a high boiling point solvent and a low boiling point solvent of the different solvents that have a boiling point difference equal to or higher than 20° C.

16 . The manufacturing method of claim 12 , wherein the low heating rate is ranged from 0.1 to 3° C./min and the high heating rate is ranged from 3 to 10° C./min.

17 . The manufacturing method of claim 13 , wherein the forming of the lithium-air battery catalyst comprises forming the lithium-air battery catalyst in a weight ranged from 1 to 50%, the conductive material in a weight ranged from 50 to 90%, and the adhesive material in a weight ranged from 1 to 10%.

Assignees

• Korea Advanced Inst Sci & Tech

Inventors

• Kim Ii-Doo
• Yoon Ki Ro

Classifications

• H01M4/8668

  Binders · CPC title

• H01M2004/8689

  Positive electrodes · CPC title

• H01M4/8882

  Heat treatment, e.g. drying, baking · CPC title

• C08K3/10

  Metal compounds · CPC title

• H01M4/382

  Lithium (H01M4/405 takes precedence) · CPC title