Electrolyte sheet for solid oxide fuel cell, method for producing the same, and single cell for solid oxide fuel cell including the same

Patent metadata

Field	Value
Publication number	US-9698443-B2
Application number	US-201314431246-A
Country	US
Kind code	B2
Filing date	Sep 27, 2013
Priority date	Sep 28, 2012
Publication date	Jul 4, 2017
Grant date	Jul 4, 2017

Abstract

In at least one of principal surfaces of the electrolyte sheet for a solid oxide fuel cell of the present invention, (1) a burr height [ΔH (0-3)] in a first zone is 100 μm or less, as measured by irradiating the principal surface of the sheet with a laser beam at a pitch of 0.01 mm using a laser optical three-dimensional shape measurement device, the first zone being a zone extending between a peripheral edge of the sheet and a position 3 mm inside the peripheral edge, and (2) a ratio [ΔH (0.61-3)/ΔH (0-0.6)] of a burr height [ΔH (0.61-3)] in a third zone to a burr height [ΔH (0-0.6)] in a second zone is 0.5 or more and 2.0 or less, as calculated from the burr heights measured by irradiating the principal surface of the sheet with a laser beam at a pitch of 0.01 mm using the laser optical three-dimensional shape measurement device, the second zone being a zone extending between the peripheral edge of the sheet and a position 0.6 mm inside the peripheral edge, and the third zone being a zone extending between a position 0.61 mm inside the peripheral edge of the sheet and the position 3 mm inside the peripheral edge.

First claim

The invention claimed is:

1. An electrolyte sheet for a solid oxide fuel cell, the sheet having a thickness of 50 to 300 μm, wherein
in at least one of principal surfaces of the sheet,
(1) a burr height [ΔH (0-3)] in a first zone is 100 μm or less, as measured by irradiating the principal surface of the sheet with a laser beam at a pitch of 0.01 mm and three-dimensionally analyzing light reflected from the principal surface using a laser optical three-dimensional shape measurement device, the first zone being a zone extending between a peripheral edge of the sheet and a position 3 mm inside the peripheral edge,
(2) a ratio [ΔH (0.61-3)/ΔH (0-0.6)] of a burr height [ΔH (0.61-3)] in a third zone to a burr height [ΔH (0-0.6)] in a second zone is 0.5 or more and 2.0 or less, as calculated from the burr heights measured by irradiating the principal surface of the sheet with a laser beam at a pitch of 0.01 mm and three-dimensionally analyzing light reflected from the principal surface using the laser optical three-dimensional shape measurement device, the second zone being a zone extending between the peripheral edge of the sheet and a position 0.6 mm inside the peripheral edge, and the third zone being a zone extending between a position 0.61 mm inside the peripheral edge of the sheet and the position 3 mm inside the peripheral edge, and
(3) a ratio [ΔH (0.11-3)/ΔH (0-0.1)] of a burr height [ΔH (0.11-3)] in a zone extending between a position 0.11 mm inside the peripheral edge of the sheet and a position 3 mm inside the peripheral edge to a burr height [ΔH (0-0.1)] in a zone extending between the peripheral edge of the sheet and a position 0.1 mm inside the peripheral edge is 0.5 or more and 1.3 or less.

2. A method for producing an electrolyte sheet for a solid oxide fuel cell, comprising:
a green sheet producing step of preparing a slurry containing a ceramic material powder, a binder, and a dispersion medium, forming the slurry into a sheet and drying the sheet to obtain a green body, and cutting the green body into a predetermined shape to obtain a green sheet for an electrolyte sheet for a solid oxide fuel cell;
a pressing step of sandwiching the green sheet between plates whose surfaces facing surfaces of the green sheet each have an arithmetical mean roughness value (Ra) of 0.001 to 0.1 μm and a dry peel force of 10 to 1000 mN/cm and applying a pressure to the green sheet; and
a sintering step of sintering the green sheet that has undergone the pressing step.

3. The method for producing an electrolyte sheet for a solid oxide fuel cell according to claim 2 , wherein in the pressing step, the pressure applied to the green sheet is adjusted so that distribution of the pressure across the surface of the green sheet is such that pressures exerted on the surface fall within a range from 15% above to 15% below an average of the pressures.

4. A single cell for a solid oxide fuel cell, comprising:
an anode;
a cathode; and
the electrolyte sheet for a solid oxide fuel cell according to claim 1 , disposed between the anode and the cathode.

Assignees

• Nippon Catalytic Chem Ind

Inventors

• Hata Kazuo
• Sakamoto Katsuhiko
• Aikawa Norikazu

Classifications

• C04B2235/963

  Surface properties, e.g. surface roughness · CPC title

• H01M8/124 Primary

  characterised by the process of manufacturing or by the material of the electrolyte · CPC title

• H01M2008/1293

  Fuel cells with solid oxide electrolytes · CPC title

• C04B35/62218

  obtaining ceramic films, e.g. by using temporary supports · CPC title

• H01M8/1246 Primary

  the electrolyte consisting of oxides · CPC title