# US 10,770,726 B2 · Method for manufacturing electrode, electrode manufactured by same, electrode structure including electrode, fuel cell or metal-air secondary battery, battery module including cell or battery, and composition for manufacturing electrode

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- Number: US 10,770,726 B2
- Document ID: US10770726B2
- Status: Granted
- Kind: B2
- Application number: 15/543,385
- Filed: 2016-03-07
- Published: 2018-01-04
- Granted: 2020-09-08
- Earliest claimed: 2015-03-06
- Assignees: LG Chem, Ltd.
- Applicants: LG Chem, Ltd.
- Inventors: Sanghyeok Im; Changseok Ryoo; Gyunjoong Kim; Kwangwook Choi; Jong Woo Kim; Yeonhyuk Heo; Tai Min Noh
- Web page: https://patentgrep.com/patent/US10770726B2

## CPC

- H01M 4/52: of nickel, cobalt or iron
- H01M 4/50: of manganese
- H01M 4/86: Inert electrodes with catalytic activity, e.g. for fuel cells
- H01M 4/8605: {Porous electrodes}
- H01M 4/88: Processes of manufacture
- H01M 4/881: {Electrolytic membranes}
- H01M 4/8882: {Heat treatment, e.g. drying, baking}
- H01M 4/9016: {Oxides, hydroxides or oxygenated metallic salts}
- H01M 8/02: Details (electrodes H01M4/86 - H01M4/98)
- H01M 8/10: Fuel cells with solid electrolytes
- H01M 12/06: with one metallic and one gaseous electrode
- H01M 12/08: composed of a half-cell of a fuel-cell type and a half-cell of the secondary-cell type
- Y02E 60/10: Energy storage using batteries
- Y02E 60/50: Fuel cells
- 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

The present specification relates to a method for manufacturing an electrode, an electrode manufactured by the same, an electrode structure including the electrode, a fuel cell or a metal-air secondary battery including the electrode, a battery module including the fuel cell or the metal-air secondary battery, and a composition for manufacturing an electrode.

## Claims

### Claim 1

A method for manufacturing a battery or a fuel cell electrode, the method comprising:
forming a film by applying a composition comprising a precursor of a composite metal oxide onto a base material,
wherein the precursor of the composite metal oxide comprises:
a first precursor comprising one to three first metals selected among lanthanum (La), strontium (St), gadolinium (Gd), samarium (Sm), barium (Ba), and bismuth (Bi); and
a second precursor comprising one to three second metals selected among manganese (Mn), cobalt (CO), iron (Fe), nicel (Ni), and calcium (Ca);
wherein the base material is an electrolyte membrane; and
manufacturing an electrode by firing the film,
wherein in the firing, the film is sintered while the precursor of the composite metal oxide undergoes a chemical transformation to form a composite metal oxide.

### Claim 2 (depends on 1)

The method of claim 1, wherein the synthesized composite metal oxide comprises at least one of lanthanum strontium manganese oxide (LSM), lanthanum strontium cobalt ferrite (LSCF), lanthanum strontium gallium magnesium oxide (LSGM), lanthanum strontium nickel ferrite (LSNF), lanthanum calcium nickel ferrite (LCNF), lanthanum strontium copper oxide (LSC), gadolinium strontium cobalt oxide (GSC), lanthanum strontium ferrite (LSF), samarium strontium cobalt oxide (SSC), barium strontium cobalt ferrite (BSCF), bismuth strontium ferrite oxide (BiSF), and bismuth strontium cobalt oxide (BiSC).

### Claim 3 (depends on 1)

The method of claim 1, wherein in the firing, a firing temperature is 900° C. or more and 1,200° C. or less.

### Claim 4 (depends on 1)

The method of claim 1, wherein in the firing, a firing time is 1 hour or more and 5 hours or less.

### Claim 5 (depends on 1)

A battery or a fuel cell electrode manufactured by the method according to claim 1.

### Claim 6 (depends on 5)

The battery or the fuel cell electrode of claim 5, wherein the electrode is an air electrode.

### Claim 7 (depends on 5)

A fuel cell comprising:
the electrode according to claim 5;
a fuel electrode; and
an electrolyte membrane provided between the electrode and the fuel electrode.

### Claim 8 (depends on 7)

The fuel cell of claim 7, wherein the electrolyte membrane is a solid electrolyte membrane or a polymer electrolyte membrane.

### Claim 9 (depends on 7)

A battery module comprising the fuel cell of claim 7 as a unit cell.

### Claim 10

A metal-air secondary battery comprising:
a battery electrode;
an anode; and
a separation membrane provided between the electrode and the anode, wherein the battery electrode is manufactured according to a method comprising:
forming a film by applying a composition comprising a precursor of a composite metal oxide onto a base material, wherein the base material is an electrolyte membrane; and
manufacturing an electrode by firing the film, wherein in the firing, the film is sintered while the precursor of the composite metal oxide undergoes a chemical transformation to form a composite metal oxide.

### Claim 11 (depends on 10)

A battery module comprising the metal-air secondary battery of claim 10 as a unit cell.

### Claim 12 (depends on 1)

An electrode structure comprising:
a solid electrolyte membrane; and
a battery or a fuel cell electrode manufactured by the method according to claim 1 on the solid electrolyte membrane.

### Claim 13 (depends on 12)

The electrode structure of claim 12, wherein the solid electrolyte membrane and the electrode are entangled with each other at an interface therebetween.

### Claim 14 (depends on 12)

The electrode structure of claim 12, wherein the electrode structure has an area specific resistance of less than 0.44 Ωcm2 at 650° C.

### Claim 15

A composition for manufacturing an electrode, the composition comprising a precursor of a composite metal oxide, wherein the precursor of the composite metal oxide comprises:
a first precursor comprising one to three first metals selected among lanthanum (La), strontium (St), gadolinium (Gd), samarium (Sm), barium (Ba), and bismuth (Bi); and
a second precursor comprising one to three second metals selected among manganese (Mn), cobalt (Co), iron (Fe), nickel (Ni), and calcium (Ca).

### Claim 16 (depends on 15)

The composition of claim 15, wherein a molar ratio of the first metal to the second metal is 0.9 to 1.1:0.9 to 1.1.

### Claim 17 (depends on 15)

The composition of claim 15, further comprising: a binder resin; and a solvent.

### Claim 18 (depends on 17)

The composition of claim 17, wherein based on a total weight of the composition for manufacturing an electrode, a content of the composite metal oxide precursor is 20 wt % or more and 60 wt % or less, a content of the binder resin is 20 wt % or more and 60 wt % or less, and a content of the solvent is 1 wt % or more and 30 wt % or less.