Method for manufacturing inorganic electrolyte membrane having improved compactness, composition for manufacturing inorganic electrolyte membrane, and inorganic electrolyte membrane manufactured using same

Patent metadata

Field	Value
Publication number	US-2017117566-A1
Application number	US-201515317279-A
Country	US
Kind code	A1
Filing date	Jul 30, 2015
Priority date	Jul 30, 2014
Publication date	Apr 27, 2017
Grant date	—

Abstract

Disclosed are a method of manufacturing an inorganic electrolyte membrane and a composition for manufacturing an inorganic electrolyte membrane, the method including: (a) mixing primary inorganic particles (<50 nm), a dispersant, and a solvent and dispersing the primary inorganic particles, thus preparing a dispersion of secondary inorganic particles having a hydrodynamic diameter of 120 to 230 nm, determined using DLS (Dynamic Light Scattering), (b) adding and mixing the dispersion of secondary inorganic particles with a binder, (c) applying a mixed solution composed of the dispersion of inorganic particles and the binder and drying the mixed solution, thus forming a green sheet, and (d) firing the green sheet, thus forming an electrolyte membrane.

First claim

1 . A method of manufacturing an inorganic electrolyte membrane, comprising:
(a) mixing primary inorganic particles (<50 nm), a dispersant, and a solvent and dispersing the primary inorganic particles, thus preparing a dispersion of secondary inorganic particles having a hydrodynamic diameter of 120 to 230 nm, determined using DLS (Dynamic Light Scattering); (b) adding and mixing the dispersion of secondary inorganic particles with a binder; (c) applying a mixed solution comprising the dispersion of secondary inorganic particles and the binder and drying the mixed solution, thus forming a green sheet; and (d) firing the green sheet, thus forming an electrolyte membrane.

2 . The method of claim 1 , wherein the dispersant is a cationic dispersant.

3 . The method of claim 1 , wherein the dispersant is an acrylate copolymer dispersant or a polyurethane-based dispersant.

4 . The method of claim 1 , wherein the dispersant is contained in an amount of 10 to 20 parts by weight based on 100 parts by weight of the primary inorganic particles in terms of SOP (Solids On Pigment).

5 . The method of claim 1 , wherein the primary inorganic particles are GDC (Gadolinium-Doped Ceria).

6 . The method of claim 1 , wherein the primary inorganic particles before the dispersing have a particle diameter of less than 50 nm, as measured using a TEM or SEM.

7 . The method of claim 1 , wherein the solvent is any one or more selected from the group consisting of alcohol, PGME (Propylene Glycol Methyl Ether), PGMEA (Propylene Glycol Methyl Ethyl Acetate), MEK (Methyl Ethyl Ketone), MIBK (Methyl IsoButyl Ketone), toluene, terpineol, DMF and DMSO.

8 - 11 . (canceled)

12 . The method of claim 1 , wherein the green sheet obtained in c) has a surface roughness Ra of 0.8 μm or less.

13 . The method of claim 1 , wherein the green sheet obtained in c) has a gloss of 10 GU (60°) or more.

14 - 15 . (canceled)

16 . A composition for manufacturing an inorganic electrolyte membrane, comprising a binder and a dispersion of secondary inorganic particles, having a hydrodynamic diameter of 120 to 230 nm determined using DLS (Dynamic Light Scattering), by dispersing primary inorganic particles (<50 nm).

17 . The composition of claim 16 , wherein the dispersion comprises a dispersant and a solvent.

18 . The composition of claim 17 , wherein the dispersant is a cationic dispersant.

19 . The composition of claim 17 , wherein the dispersant is an acrylate copolymer dispersant or a polyurethane-based dispersant.

20 . The composition of claim 17 , wherein the dispersant is contained in an amount of 10 to 20 parts by weight based on 100 parts by weight of the primary inorganic particles in terms of SOP (Solids On Pigment).

21 . The composition of claim 16 , wherein the primary inorganic particles are GDC (Gadolinium-Doped Ceria).

22 . The composition of claim 17 , wherein the solvent is any one or more selected from the group consisting of alcohol, PGME (Propylene Glycol Methyl Ether), PGMEA (Propylene Glycol Methyl Ethyl Acetate), MEK (Methyl Ethyl Ketone), MIBK (Methyl IsoButyl Ketone), toluene, terpineol, DMF and DMSO.

23 . The composition of claim 17 , wherein the solvent is contained in an amount of 80 to 90 parts by weight based on 100 parts by weight of the primary inorganic particles.

24 . (canceled)

25 . A green sheet, manufactured by applying and drying the composition of claim 16 .

26 . The green sheet of claim 25 , wherein the green sheet has a surface roughness Ra of 0.8 μm or less.

27 . The green sheet of claim 25 , wherein the green sheet has a gloss of 10 GU (60°) or more.

28 . (canceled)

29 . An inorganic electrolyte membrane, manufactured by firing the green sheet of claim 25 .

30 . (canceled)

Assignees

• Lg Chemical Ltd

Inventors

• Yoon Ki-Youl
• Shin Dong-Oh
• Choi Kwang-Wook
• Choi Hyeon

Classifications

• H01B1/08

  oxides · CPC title

• H01M2300/0091

  in the form of mixtures · CPC title

• H01M2008/1293

  Fuel cells with solid oxide electrolytes · CPC title

• H01M8/126 Primary

  the electrolyte containing cerium oxide · CPC title

• H01M2300/0074

  Ion conductive at high temperature · CPC title