Chemistry: electrical current producing apparatus – product – and – Current producing cell – elements – subcombinations and... – Separator – retainer or spacer insulating structure
Patent
1980-07-31
1982-11-16
Skapars, Anthony
Chemistry: electrical current producing apparatus, product, and
Current producing cell, elements, subcombinations and...
Separator, retainer or spacer insulating structure
429206, 429248, 429250, 429252, H01M 214
Patent
active
043595103
ABSTRACT:
The present invention is directed to microporous membranes having a surfactant impregnated therein which is coated on at least one surface thereof with a polymer coating, such as cellulose acetate. The polymer coating possesses functional groups in the presence of an aqueous alkaline environment which permits it to undergo hydrogen bonding with water and to transport battery electrolyte through the coating by diffusion. The presence of the coating on the normally hydrophobic substrate membrane, when used in conjunction with a suitable surfactant, increases the wettability of the substrate membrane and thereby lowers its electrical resistance. The coating also serves to immobilize various soluble electrode derived ions at the coating-electrolyte interface thereby hindering their penetration into the pores of the substrate microporous membrane. Consequently, the plugging of the pores of the substrate membrane by these ions is substantially reduced thereby increasing the life of a battery in which said coated membranes are used as the battery separators.
REFERENCES:
patent: 3472700 (1969-10-01), Kollman et al.
patent: 4192908 (1980-03-01), Himy et al.
patent: 4192988 (1980-03-01), Himy
patent: 4217404 (1980-08-01), Verzwyvelt
"High Cycle Life, High Rate Nickel-Zinc Battery Report No. 2" for ERADCOM by Otto Wagner.
"High Cycle Life, High Energy Density Nickel-Zinc Battery Report No. 3" by Otto Wagner.
"High Rate Stable Nickel-Cadmium Batteries" (DELET-TR-75-1770-F) by J. Hill (Aug. 1979).
Blanke Robert J.
Celanese Corporation
Skapars Anthony
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