Electrochemical cell electrode separator and method of making it

Details Electrochemical cell electrode separator and method of making it Electrochemical cell electrode separator and method of making it

1975-08-20

1977-02-08

Mack, John H.

Chemistry: electrical current producing apparatus, product, and

Having diverse cells or diverse removable cells in a support...

429 34, 429 40, 429 46, H01M 802, H01M 200

Patent

active

040070590

ABSTRACT:
An ion permeable material particularly useful for electrode separators. The material is a uniform mixture of 30 to 70% by weight colloidal size asbestos fibers and 20 to 40% by weight unsintered fine polytetrafluoroethylene fibers, bonded together with uniformly dispersed particles of a fluorinated ethylene-propylene copolymer comprising about 5 to 15% by weight of the material. Colloidal size particles of an alkaline earth metal oxide are dispersed throughout the material. The material is initially prepared in a modified paper making process and then heated to a temperature high enough to fuse the fluorinated ethylene-propylene copolymer but not high enough to sinter the polytetrafluoroethylene fibers. An improved zinc-air hybrid fuel cell and an improved silver oxide-zinc secondary battery are made possible with electrode separators such as described herein.

REFERENCES:
patent: 3246767 (1966-04-01), Pall et al.
patent: 3342642 (1967-09-01), Barber
patent: 3594233 (1971-07-01), Charkey et al.
patent: 3607423 (1971-09-01), Bertioli
patent: 3704221 (1972-11-01), McCully

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