Chemistry: electrical current producing apparatus – product – and – Current producing cell – elements – subcombinations and... – Separator – retainer – spacer or materials for use therewith
Patent
1979-07-13
1980-09-23
LeFevour, Charles F.
Chemistry: electrical current producing apparatus, product, and
Current producing cell, elements, subcombinations and...
Separator, retainer, spacer or materials for use therewith
H01M 216
Patent
active
042243947
ABSTRACT:
An improved battery separator for alkaline battery cells has low resistance to electrolyte ion transfer and high resistance to electrode ion transfer. The separator is formed by applying an improved coating to an electrolyte absorber. The absorber, preferably, is a flexible, fibrous, and porous substrate that is resistant to strong alkali and oxidation. The coating composition includes an admixture of a polymeric binder, a hydrolyzable polymeric ester and inert fillers. The coating composition is substantially free of reactive fillers and plasticizers commonly employed as porosity promoting agents in separator coatings. When the separator is immersed in electrolyte, the polymeric ester of the film coating reacts with the electrolyte forming a salt and an alcohol. The alcohol goes into solution with the electrolyte while the salt imbibes electrolyte into the coating composition.
When the salt is formed, it expands the polymeric chains of the binder to provide a film coating substantially permeable to electrolyte ion transfer but relatively impermeable to electrode ion transfer during use.
REFERENCES:
patent: 3036143 (1962-05-01), Fisher et al.
patent: 3376168 (1968-04-01), Horowitz
patent: 3625770 (1971-12-01), Arrance et al.
patent: 3730777 (1973-05-01), Krey
patent: 4085241 (1978-04-01), Sheibley
patent: 4168352 (1979-09-01), Dick et al.
NASA TM X-3199 "Factors Influencing Flexibility, Resistivity, and Zinc Dendrite Penetration Rate of Inorg. Separators for Alkaline Batteries", Sheibley, Mar. 1975.
NASA TM X-3080 "Structure & Function of an Inorg.-Org. Separator for Electrochem. Cells-Prelim. Study", Bozek, Jul., 1974.
NASA TM X-3465 "New Separators for Nickel-Zinc Batteries", Sheibley.
Fredericks Wendell K.
Herrick William D.
Kimberly Clark Corporation
LeFevour Charles F.
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