Patent ID: 8497047
Filing Date: 2013-07-30
Classification: C03C,H01M,Y02E,Y02P

Abstract:
1. Solid oxide fuel cell stack obtainable by a process comprising the steps of: (a) forming a first fuel cell stack assembly by alternating at least one interconnector plate with at least one fuel cell unit, in which each fuel cell unit comprises an anode, a cathode and an electrolyte arranged between the anode and cathode, and providing a glass sealant in between the interconnector plate and each fuel cell unit in which the glass sealant has the composition: 50-70 wt % SiO 2 , 0-20 wt % Al 2 O 3 , 10-50 wt % CaO, 0-10 wt % MgO, 0-6 wt % (Na 2 O+K 2 O), 0-10 wt % B 2 O 3 , and 0-5 wt % of functional elements selected from TiO 2 , ZrO 2 , F, P 2 O 5 , MoO 3 , Fe 2 O 3 , MnO 2 , La.Sr—Mn—O perovskite (LSM) and combinations thereof; (b) converting said first fuel cell stack assembly into a second assembly having a glass sealant of thickness 5-100 μm by heating said first assembly to a temperature of 500° C. or higher and subjecting the cell stack to a load pressure of 2 to 20 kg/cm (c) converting said second assembly into a final fuel cell stack assembly by cooling the second assembly of step (b) to a temperature below that of step (b).