Sealing glass for solid oxide electrolysis cell (SOEC) stacks

Patent metadata

Field	Value
Publication number	US-9695518-B2
Application number	US-201013499925-A
Country	US
Kind code	B2
Filing date	Oct 5, 2010
Priority date	Oct 6, 2009
Publication date	Jul 4, 2017
Grant date	Jul 4, 2017

Abstract

Solid oxide electrolysis cell (SOEC) stack obtainable by a process comprising the use of a glass sealant with composition 50 to 70 wt % SiO2, 0 to 20 wt % Al2O3, 10 to 50 wt % CaO, 0 to 10 wt % MgO, 0 to 2 wt % (Na2o 1K2O), 0 to 10 wt % b2O3, and 0 to 5 wt % of functional elements selected from TiO2, ZrO2, ZrO2, F, P2O5, Mo03, FeO3, MnO 2, La—Sr—Mn—O perovskite (LSM) and combinations thereof. Preferably, the sealant is a sheet of E-glass fibers with a composition in wt % of 52-56 SiO2, 12-16AL2O3, 16-25 CaO, 0-6MgO, 0-2 Na2+K2O, 0-10 B2O3, 0-1.5 TiO2, O-1F.

First claim

The invention claimed is:

1. Solid oxide electrolysis cell (SOEC) stack, comprising:
a first cell stack assembly comprising at least one interconnector plate alternating with at least one cell unit, in which each cell unit comprises a first electrode, a second electrode and an electrolyte arranged between these electrodes, and a glass fibre sealant sheet disposed in between the interconnector plate and each cell unit, in which the glass sealant is an E-glass and is a barium oxide free composition which contains: 52-62 wt % SiO 2 , 10-15 wt % Al 2 O 3 , 18-25 wt % CaO, 0.5-4 wt % MgO, Na 2 O, K 2 O, both Na 2 O and K 2 O being present in a combined amount of 0.25-2 wt %, 3.5 wt % B 2 O 3 , and 0-5 wt % of functional elements selected from TiO 2 , ZrO 2 , F 2 , P 2 O 5 , MoO 3 , Fe 2 O 3 , MnO 2 , La—Sr-M perovskite (LSM) and combinations thereof;
said first cell stack assembly converted into a second assembly having a glass sealant of thickness between 5 and 100 μm by heating said first assembly to a heating temperature of 500° C. or higher and subjecting the cell stack to a load pressure of 2-20 kg/cm 2 ; and
said second assembly converted into a final solid oxide electrolysis cell stack assembly by cooling the second assembly to a temperature below the heating temperature, the SOEC exhibiting a degradation rate of about 1%/1000 hours.

2. Solid oxide electrolysis cell stack according to claim 1 wherein the heating temperature is 800° C. or higher and the load pressure is 2-10 kg/cm 2 , and results in a glass sealant of thickness between 5 and about 50 μm.

3. Solid oxide electrolysis cell stack according to claim 1 , wherein the content of SiO 2 , Al 2 O 3 , CaO and MgO represents 85-95 wt % or 87-97 wt % of the glass sealant composition, the content of Na 2 O+K 2 O and B 2 O 3 represents 3.75 to 5.5 wt % of the glass sealant composition and functional elements selected from TiO 2 , F 2 , ZrO 2 , P 2 O 5 , MoO 3 , Fe 2 O 3 , MnO 2 and La—Sr—Mn—O perovskite (LSM) and combinations thereof represent 0-5 wt %.

4. Solid oxide electrolysis cell stack according to claim 1 , wherein the glass sealant is loaded with filler material in the form of MgO, steel-powder, quartz, leucite and combinations thereof.

Assignees

• Nielsen Jens Ulrik
• Larsen Jørgen Gutzon
• Haldor Topsoe As

Inventors

• Nielsen Jens Ulrik
• Larsen Jørgen Gutzon

Classifications

• H01M8/0282

  Inorganic material · CPC title

• C04B2237/40

  Metallic · CPC title

• C04B2237/348

  Zirconia, hafnia, zirconates or hafnates · CPC title

• C04B2237/10

  Glass interlayers, e.g. frit or flux · CPC title

• C04B37/02

  with metallic articles · CPC title