Development and characterizations of Bi2O3-containing glass–ceramic sealants for sodium sulfur battery

Abstract Bi 2 O 3 -containing glass–ceramic sealants for sodium sulfur battery are developed by doping the nucleating agent TiO 2 . The crystallization behavior of the glasses with the dopants is studied. The addition of nucleating agent TiO 2 induces the precipitation of Bi 2 Ti 2 O 7 crystal. The thermal expansion match between the Bi 2 O 3 -containing glass–ceramics and the α-, β-Al 2 O 3 is relatively satisfactory. The joining properties of the sealants involving the bonding strength, thermal shock resistance, chemical stability and corrosion resistance are evaluated. No microcracks were observed in the AC5/α-, β-Al 2 O 3 joint after 200-times thermal shock between 350 °C and room temperature. The thickness of diffusion layer was about 10 μm after holding at 350 °C for 200 h. Moreover, the existence of small size crystalline Bi 2 Ti 2 O 7 phase reasonably enhances the sulfur corrosion resistance.