Hydrophilic polymer coated microporous membranes capable of use

Details Hydrophilic polymer coated microporous membranes capable of use Hydrophilic polymer coated microporous membranes capable of use

1982-09-03

1984-03-20

Skapars, Anthony

Chemistry: electrical current producing apparatus, product, and

Current producing cell, elements, subcombinations and...

Separator, retainer, spacer or materials for use therewith

427 58, 427245, H01M 216

Patent

active

044381859

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 battery separators.

REFERENCES:
patent: 3426754 (1969-02-01), Bierenbaum
patent: 3558764 (1971-01-01), Isaacson et al.
patent: 3679538 (1972-07-01), Druin et al.
patent: 3839516 (1974-10-01), Williams et al.
patent: 3853601 (1974-10-01), Taskier

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