Solid electrolyte for sodium-sulfur battery and method for producing sodium-sulfur battery using the same

摘要

PURPOSE:To suppress the deterioration of beta-alumina-based ceramics due to humidity absorption by coating the beta-alumina-based ceramics with a water repelling material, granulating the ceramics to have prescribed particle size, and then firing the resulting ceramics. CONSTITUTION:A synthetic powder of beta''-alumina, a beta-alumina-based ceramic consisting of beta-alumina, or a ceramic containing both ceramics is coated with a water repelling material. The resulting powder is granulated into 30-100mum particle size and the granulated powder is molded and then sintered. As a result, at the time of production of solid electrolytes, deterioration and size alteration due to humidity absorption before sintering and damage and crack formation attributed to them at the time of sintering are suppressed and formability is improved. a sodium-sulfur battery having the solid electrolyte prepared in that way surely has high reliability. Furthermore, since coating with the water repelling material is done, materials containing water as a main component may be selected as a binder and a solvent at the time of granulation and thus there is a wide option to select binders and solvents.