초록 ▼

The present invention provides a microporous membrane having deposited on at least one surface thereof a porous, uniform coating of a low hydrogen over-potential material. The coated microporous membrane is particularly suited for use as a battery separator in a rechargeable zinc electrode containin

The present invention provides a microporous membrane having deposited on at least one surface thereof a porous, uniform coating of a low hydrogen over-potential material. The coated microporous membrane is particularly suited for use as a battery separator in a rechargeable zinc electrode containing battery, which is resistant to penetration by zinc dendrites and is capable of increasing the uniformity of current density upon recharging of the battery. A battery employing said coated microporous membrane as a battery separator as well as a process for using said coated microporous membrane is also provided.

대표청구항 ▼

At least one open-celled microporous membrane having deposited on at least one surface thereof a uniform porous coating comprising a low hydrogen over-potential material, said microporous membrane prior to deposition of said coating being characterized by an electrical resistance when rendered hydro

At least one open-celled microporous membrane having deposited on at least one surface thereof a uniform porous coating comprising a low hydrogen over-potential material, said microporous membrane prior to deposition of said coating being characterized by an electrical resistance when rendered hydrophilic of not greater than about 15 milliohms-in2, a reduced bulk density as compared to the corresponding substrate membrane having no open-celled structure, a surface area of at least 10 square meters per gram, and an average pore size of from about 200 to about 10,000 angstroms, said porous coating covering an area which is substantially coextensive with the surface of the microporous substrate membrane on which it is deposited and being characterized by a uniform total thickness of at least 50 angstroms, yet insufficient to cause the electrical resistance of said coat of microporous membrane to exceed about 75 milliohms-in2, when rendered hydrophilic, said coated microporous membrane having the ability to pass greater than about 0.01 mililiters of water per minute per square centimeter at a water pressure of 100 pounds per square inch gauge.