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

Patent metadata

Field	Value
Publication number	US-10770726-B2
Application number	US-201615543385-A
Country	US
Kind code	B2
Filing date	Mar 7, 2016
Priority date	Mar 6, 2015
Publication date	Sep 8, 2020
Grant date	Sep 8, 2020

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.

First claim

The invention claimed is:

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.

2. 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).

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

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

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

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

7. 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.

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

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

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.

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

12. 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.

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

14. The electrode structure of claim 12 , wherein the electrode structure has an area specific resistance of less than 0.44 Ωcm 2 at 650° C.

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).

16. 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.

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

18. 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.

Assignees

• Lg Chemical Ltd

Inventors

• Im Sanghyeok
• Ryoo Changseok
• Kim Gyunjoong
• Choi Kwangwook
• Kim Jong Woo
• Heo Yeonhyuk
• Noh Tai Min

Classifications

• H01M4/881

  Electrolytic membranes · CPC title

• H01M4/9016

  Oxides, hydroxides or oxygenated metallic salts · CPC title

• H01M4/88

  Processes of manufacture · CPC title

• H01M12/08

  composed of a half-cell of a fuel-cell type and a half-cell of the secondary-cell type · CPC title

• H01M12/06

  with one metallic and one gaseous electrode · CPC title