Sealing glasses for electrochemical, electrical, electronic, and

Details Sealing glasses for electrochemical, electrical, electronic, and Sealing glasses for electrochemical, electrical, electronic, and

1981-08-20

1982-08-31

LeFevour, Charles F.

Chemistry: electrical current producing apparatus, product, and

Current producing cell, elements, subcombinations and...

Include electrolyte chemically specified and method

429104, 429185, 501 11, H01M 618

Patent

active

043472958

ABSTRACT:
This invention is directed to the production of sealing glasses capable of forming strong, non-porous seals with glasses containing at least 10% by weight of an alkali metal oxide such as are used in the fabrication of the glass membranes utilized in sodium-sulfur and potassium-sulfur batteries. The inventive seals require an interdiffusion of ions to occur between the sealing glass and the glass being sealed. Glasses presently employed as membrane glasses for such batteries have base compositions within the Na.sub.2 O--B.sub.2 O.sub.3 and K.sub.2 O--B.sub.2 O.sub.3 systems. The inventive sealing glasses consist essentially, expressed in mole percent on the oxide basis, of about 3-30% R.sub.2 O and 60-95% B.sub.2 O.sub.3, wherein R.sub.2 O consists of K.sub.2 O, Rb.sub.2 O, Cs.sub.2 O, and mixtures thereof and, optionally, Al.sub.2 O.sub.3 is substituted for up to one-half the B.sub.2 O.sub.3 content on a molar basis. The seals contemplate the exchange of large alkali metal ions from the sealing glass for the smaller alkali metal ions of the membrane glass.

REFERENCES:
patent: 3679480 (1972-07-01), Brown et al.
patent: 3829331 (1974-08-01), Tsang
patent: 3877995 (1975-04-01), Levine et al.
patent: 4105834 (1978-08-01), Baker et al.
patent: 4219613 (1980-08-01), Anand et al.

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