# US 11,909,028 B2 · Cathode for metal-air battery, preparing method thereof, and metal-air battery comprising the same

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- Number: US 11,909,028 B2
- Document ID: US11909028B2
- Status: Granted
- Kind: B2
- Application number: 16/852,677
- Filed: 2020-04-20
- Published: 2021-04-29
- Granted: 2024-02-20
- Earliest claimed: 2019-10-23
- Assignees: Samsung Electronics Co., Ltd.
- Applicants: Samsung Electronics Co., Ltd.
- Inventors: Hyunpyo Lee; Mokwon Kim; Taeyoung Kim; Wonsung Choi
- Web page: https://patentgrep.com/patent/US11909028B2

## CPC

- H01M 4/131: Electrodes based on mixed oxides or hydroxides, or on mixtures of oxides or hydroxides, e.g. LiCoOx
- H01M 4/8605: {Porous electrodes}
- H01M 4/0442: {Anodisation, Oxidation (electrolytic coating by anodisation C25D9/00)}
- H01M 4/0471: {involving thermal treatment, e.g. firing, sintering, backing particulate active material, thermal decomposition, pyrolysis}
- H01M 4/134: Electrodes based on metals, Si or alloys
- H01M 4/505: of mixed oxides or hydroxides containing manganese for inserting or intercalating light metals, e.g. LiMn2O4 or LiMn2OxFy
- H01M 4/525: of mixed oxides or hydroxides containing iron, cobalt or nickel for inserting or intercalating light metals, e.g. LiNiO2, LiCoO2 or LiCoOxFy
- H01M 4/58: of inorganic compounds other than oxides or hydroxides, e.g. sulfides, selenides, tellurides, halogenides or LiCoFy; of polyanionic structures, e.g. phosphates, silicates or borates
- H01M 4/621: {Binders}
- H01M 4/663: {containing carbon or carbonaceous materials as conductive part, e.g. graphite, carbon fibres}
- H01M 4/667: {in the form of layers, e.g. coatings}
- H01M 4/8663: {Selection of inactive substances as ingredients for catalytic active masses, e.g. binders, fillers}
- H01M 4/8828: {Coating with slurry or ink}
- H01M 4/8882: {Heat treatment, e.g. drying, baking}
- H01M 4/9033: {Complex oxides, optionally doped, of the type M1MeO3, M1 being an alkaline earth metal or a rare earth, Me being a metal, e.g. perovskites}
- H01M 10/0525: Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
- H01M 10/0569: characterised by the solvents
- H01M 12/08: composed of a half-cell of a fuel-cell type and a half-cell of the secondary-cell type
- H01M 4/8668: {Binders}
- H01M 4/8673: {Electrically conductive fillers}
- H01M 2004/021: {Physical characteristics, e.g. porosity, surface area}
- Y02E 60/10: Energy storage using batteries
- H01M: PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- Y02E: REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION

## Abstract

A cathode for a metal-air battery, the cathode including a mixed conductor; and first pores having a size of about 1 micrometer (μm) or greater, wherein an amount of the first pores is about 30 volume percent (volume %) or greater, with respect to a total volume of pores in the cathode, and a total porosity of the cathode is about 50% or greater, based on a total volume of the cathode.

## Claims

### Claim 1

A cathode for a metal-air battery, the cathode comprising:
a mixed conductor; and
first pores having a size of about 1 micrometer or greater,
wherein an amount of the first pores is about 30 volume percent to about 95 volume percent, with respect to a total volume of pores in the cathode, and
a total porosity of the cathode is about 70 percent to about 95 percent, based on a total volume of the cathode,
wherein the mixed conductor is a perovskite compound represented by Formula 5:
LixAlyG1zO3−δ Formula 5
wherein, in Formula 5,
A1 is at least one of La, Ce, Pr, Gd, Ca, Sr, or Ba,
G1 is at least one of Mn, Ru, Cr, Co, Ir, Fe, Pd, Pb, Rh, Sn, V, Re, Ge, W, Mo, Hf, or Bi, and
0.2<x≤0.5, 0.4<y≤0.6, 0<x+y<1, 0.8<z≤1.2, and 0≤δ≤0.4.

### Claim 2 (depends on 1)

The cathode of claim 1, wherein the mixed conductor has an electronic conductivity of about 1×10−6 Siemens per centimeter or greater.

### Claim 3 (depends on 1)

The cathode of claim 1, wherein the mixed conductor has an ionic conductivity of about 1×10−8 Siemens per centimeter or greater.

### Claim 4 (depends on 1)

The cathode of claim 1, wherein the mixed conductor has a particle size of about 10 nanometers to about 500 nanometers.

### Claim 5 (depends on 1)

The cathode of claim 1, wherein the size of the first pores is about 1 micrometer to about 100 micrometers.

### Claim 6 (depends on 1)

The cathode of claim 1, wherein the cathode has a thickness of about 5 micrometers to about 100 micrometers.

### Claim 7 (depends on 1)

The cathode of claim 1, wherein
G1 is Ru, and
δ is oxygen vacancy.

### Claim 8 (depends on 1)

The cathode of claim 1, wherein the mixed conductor is Li0.34La0.55RuO3.

### Claim 9 (depends on 1)

The cathode of claim 1, wherein the mixed conductor has an oxidation potential that is greater than an oxidation potential of carbon and a reduction potential that is less than a reduction potential of carbon.

### Claim 10 (depends on 1)

The cathode of claim 1, wherein the mixed conductor has a stability to being decomposed by an electrochemical reaction that is greater than a stability of carbon to being decomposed by an electrochemical reaction.

### Claim 11 (depends on 1)

A metal-air battery comprising:
the cathode according to claim 1;
an anode; and
an electrolyte disposed between the cathode and the anode.

### Claim 12 (depends on 11)

The metal-air battery of claim 11, wherein the electrolyte comprises a solid electrolyte.

### Claim 13 (depends on 11)

The metal-air battery of claim 11, wherein the anode comprises at least one of lithium, magnesium, iron, aluminum, or zinc, or an alloy thereof.

### Claim 14 (depends on 1)

A method of manufacturing the cathode for a metal-air battery of claim 1, the method comprising:
mixing the mixed conductor, organic particles having a size of about 1 micrometer or greater, and a solvent to prepare a composition;
coating the composition on a substrate to provide a coated substrate; and then
thermally treating the coated substrate to manufacture the cathode.

### Claim 15 (depends on 14)

The method of claim 14, wherein the composition further comprises a binder.

### Claim 16 (depends on 14)

The method of claim 14, wherein the thermally treating comprises thermally treating at a temperature of 450° C. to 800° C.

### Claim 17 (depends on 14)

The method of claim 14, wherein an amount of the organic particles is about 5 parts by weight to about 60 parts by weight, with respect to 100 parts by weight of the mixed conductor.

### Claim 18

A cathode for a metal-air battery, the cathode consisting of:
a mixed conductor; and
first pores having a size of about 1 micrometer or greater,
wherein an amount of the first pores is about 30 volume percent or greater, with respect to a total volume of pores in the cathode, and
a total porosity of the cathode is about 50 percent or greater, based on a total volume of the cathode,
wherein the mixed conductor is a perovskite compound represented by Formula 5:
LixAlyG1zO3−δ Formula 5
wherein, in Formula 5,
A1 is at least one of La, Ce, Pr, Gd, Ca, Sr, or Ba,
G1 is at least one of Mn, Ru, Cr, Co, Ir, Fe, Pd, Pb, Rh, Sn, V, Re, Ge, W, Mo, Hf, or Bi, and 0.2<x≤0.5, 0.4<y≤0.6, 0<x+y<1, 0.8<z≤1.2, and 0≤δ≤0.4.

### Claim 19

A cathode for a metal-air battery, the cathode comprising:
a mixed conductor; and
first pores having a size of about 1 micrometer or greater,
wherein an amount of the first pores is about 30 volume percent to about 95 volume percent, with respect to a total volume of pores in the cathode, and
a total porosity of the cathode is about 70 percent to about 95 percent, based on a total volume of the cathode,
wherein the mixed conductor is a perovskite compound represented by Formula 5:
LixAlyG1zO3−δ Formula 5
wherein, in Formula 5,
Al is at least one of La, Ce, Pr, Gd, Ca, Sr, or Ba,
G1 is at least one of Mn, Ru, Cr, Co, Ir, Fe, Pd, Pb, Rh, Sn, V, Re, Ge, W, Mo, Hf, or Bi, and 0.2<x≤0.5, 0.4<y≤0.7, 0<x+y<1, 0.8<z≤1.2, and 0≤δ≤1, and
wherein the cathode comprises about 70 parts to about 100 parts by weight of the mixed conductor, with respect to 100 parts by weight of the cathode.