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Separator for a battery having a zinc electrode

Inactive Publication Date: 2005-09-22
CELGARD LLC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

While NiZn cells are well known, they have never reached a significant commercial success; apparently, because of the limited effective cycle life of such batteries.
These dendrites grow in the direction of counter electrode and finally cause electrical shorts.
However, this remedy does not have long-lasting effectiveness.
While Celgard 3406 performs adequately, it has a limited shelf life (about 9 months from the coating date) and it wets only once (i.e., the surfactant readily washes off).

Method used

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Examples

Experimental program
Comparison scheme
Effect test

examples

[0030] The separator made according to instant invention was compared to the commercially available products, i.e. Celgard® 3407 microporous membrane and Celgard® 3406 microporous membrane at 70° C. The comparative analysis included six separator samples. Coating solution of sample 1 (3407 control), as shown in Table I, included, on a weight of a solvent basis, 1.75% cellulose acetate, 4% IGEPAL CO-530, and 0% VICTAWET-12. Coating solution of sample 2, as shown in Table I, included, on a weight of a solvent basis, 1.75% cellulose acetate, 3.5% IGEPAL CO-530, and 0.5% VICTAWET-12. Coating solution of sample 3, as shown in Table I, included, on a weight of a solvent basis, 1.75% cellulose acetate, 3.0% IGEPAL CO-530, and 1.0% VICTAWET-12. Coating solution of sample 4, as shown in Table I, included, on a weight of a solvent basis, 1.75% cellulose acetate, 2.0% IGEPAL CO-530, and 2.0% VICTAWET-12. Coating solution of sample 5, as shown in Table I, included, on a weight of a solvent basi...

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PUM

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Abstract

The instant invention is a separator for a battery having a zinc electrode. The battery separator according to the instant invention includes a microporous membrane, and a coating on at least one surface of the microporous membrane. The coating includes a mixture of 25-40 weight % polymer and 60-75 weight % surfactant combination. The polymer is cellulose acetate, and the surfactant combination includes a first surfactant and a second surfactant. The first surfactant, preferably, has an active ingredient selected from the group consisting of organic ethers, and the second surfactant is, preferably, an oxirane polymer with 2-ethylhexyl dihydrogen phosphate.

Description

FIELD OF INVENTION [0001] The instant invention relates to a separator for a battery having a zinc electrode. BACKGROUND OF THE INVENTION [0002] Batteries having zinc electrodes are known. See U.S. Pat. Nos. 4,359,510; 4,438,185; and 4,544,616; Tuck, C. D. S., Editor, Modern Battery Technology, Ellis Horwood Limited, Chichester, England (1991); and Linden, D., Editor, Handbook of Batteries, Second Edition, McGraw-Hill, Inc., New York, N.Y. (1995), each of which is incorporated herein by reference. One such battery is the nickel-zinc (NiZn) battery (or cell). [0003] The nickel-zinc (zinc / nickel oxide) battery system includes a zinc electrode, a nickel electrode, an electrolyte, and a separator. The zinc / nickel oxide battery system uses zinc as the negative active material and nickel oxide as the positive, and the electrolyte is an alkaline potassium hydroxide solution. [0004] While NiZn cells are well known, they have never reached a significant commercial success; apparently, becaus...

Claims

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Application Information

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IPC IPC(8): H01M10/04H01M10/30H01M10/36H01M50/414H01M50/429H01M50/457H01M50/489H01M50/491
CPCH01M2/1653H01M2/1686Y02E60/124H01M10/30H01M10/36H01M2/18Y02E60/10Y02P70/50H01M50/429H01M50/457H01M50/414H01M50/491H01M50/489H01M50/449H01M50/463H01M4/244H01M4/32
Inventor WATSON, JILL V.WENSLEY, C. GLEN
Owner CELGARD LLC