ELECTROLYTE SHEET FOR SOLID OXIDE FUEL CELL, ITS MANUFACTURING METHOD, AND SOLID OXIDE FUEL CELL

• Main Authors: HATA KAZUO, MIZUTANI YASUNOBU, UKAI KENJI, HISADA KOJI, YOKOYAMA MISUZU
• Format: Patent
• Language: English
• Published: 31.08.2006
• Subjects: BASIC ELECTRIC ELEMENTS; CABLES; CONDUCTORS; ELECTRICITY; INSULATORS; PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSIONOF CHEMICAL INTO ELECTRICAL ENERGY; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING ORDIELECTRIC PROPERTIES

PROBLEM TO BE SOLVED: To provide an electrolyte sheet for a solid oxide fuel cell flat in shape, high in mechanical strength, less in variation with time, and making industrial mass production possible with a raw material easy to industrially obtain and inexpensive. SOLUTION: The electrolyte sheet for the solid oxide fuel cell is formed by a doctor blade process or an extrusion molding process, is a scandia stabilized zirconia sheet containing 4-6 mol% scandia to zirconia, has crystal structure of polycrystal system mainly comprising tetragon and containing monoclinic crystal, has a monoclinic crystal ratio M(%) calculated from diffraction peak intensity by X-ray diffraction based on formula (1) of 1-80%, and a Weibull coefficient (m) not lower than 10.Formula (1): monoclinic crystal ratio (M%)=[[monoclinic(1, 1, 1)+monoclinic (-1, 1, 1)]/[tetragonal and cubic (1, 1, 1)+monoclinic (1, 1, 1)+monoclinic (-1, 1, 1)]]×100. COPYRIGHT: (C)2006,JPO&NCIPI