A novel Bi-doped borosilicate glass as sealant for sodium sulfur battery. Part 1: Thermophysical characteristics and structure

Abstract A novel Bi-doped borosilicate glass has been developed as sealant for sodium sulfur battery. The thermophysical characteristics like thermal expansion coefficient, glass transition and softening temperatures, viscosities and densities of the Bi-doped and undoped glasses are systematically studied. It is found that the thermal expansion match between the Bi-doped glasses and alpha-alumina/beta-alumina is satisfactory. The Bi-doped glass has a viscosity around 10 5  Pa s in 800–850 °C range, which is suitable to allow a good bonding with the sealed parts. The FTIR analysis indicates that the substitution of Bi 2 O 3 for SiO 2 makes the glass network less rigid. Bi 2 O 3 builds the glass network as [BiO 6 ] unit. [BO 4 ] unit enters the glass network and induces the overlapped vibrations of [BO 4 ] unit and [SiO 4 ] tetrahedron. The Bi-doped glass sealant exhibits superior chemical compatibility with alpha-alumina and beta-alumina.

[1]  Z. Lü,et al.  Characteristics of a SiO2–B2O3–Al2O3–BaCO3–PbO2–ZnO glass–ceramic sealant for SOFCs , 2007 .

[2]  Zhonghua Gu,et al.  Research activities in Shanghai Institute of Ceramics, Chinese Academy of Sciences on the solid electrolytes for sodium sulfur batteries , 2008 .

[3]  M. Gomaa,et al.  Effect of compositional changes on the structure and properties of alkali-alumino borosilicate glasses , 2006 .

[4]  I. Ardelean,et al.  EPR and FT-IR spectroscopic studies of B2O3Bi2O3MnO glasses , 2005 .

[5]  E. Culea,et al.  FTIR spectroscopic study of some bismuth germanate glasses containing gadolinium ions , 2008 .

[6]  G. Chryssikos,et al.  Vibrational spectra of magnesium-sodium-borate glasses. 2. Raman and mid-infrared investigation of the network structure , 1987 .

[7]  K. El-Egili.  Infrared studies of Na2O–B2O3–SiO2 and Al2O3–Na2O–B2O3–SiO2 glasses , 2003 .

[8]  G. Chryssikos,et al.  Infrared reflectance spectra of lithium borate glasses , 1990 .

[9]  S. Sakka,et al.  Structure of PbO_Bi2O3_Ga2O3 glasses , 1991 .

[10]  A. Montenero,et al.  IR spectra and structure of V2O5GeO2Bi2O3 glasses , 1994 .

[11]  L. Montagne,et al.  Role of bismuth and titanium in Na2O–Bi2O3–TiO2–P2O5 glasses and a model of structural units , 2002 .

[12]  Weiming Guo,et al.  Structure and crystallization kinetics of Bi2O3-B2O3 glasses , 2006 .

[13]  M. Wierzbicki,et al.  Formation and properties of soda lime aluminate glasses , 1995 .

[14]  L. Börjesson,et al.  The boson peak in glass formers of increasing fragility , 1994 .

[15]  T. Sado,et al.  Sodium Sulfur Battery , 1985 .

[16]  S. Sakka,et al.  Relation between apparent glass transition temperature and liquids temperature for inorganic glasses , 1971 .

[17]  K. Sun,et al.  CALCULATION OF DENSITY AND OPTICAL CONSTANTS OF A GLASS FROM ITS COMPOSITION IN WEIGHT PERCENTAGE , 1943 .