Accession Number : AD0857500

Title :   Long Life Stable Zinc Electrodes for Alkaline Secondary Batteries.

Descriptive Note : Rept. no. 8 (Final), Dec 66-Feb 69,

Corporate Author : YARDNEY ELECTRIC CORP NEW YORK

Personal Author(s) : Goodkin, G. ; McBreen, J. ; Dalin, G.

Report Date : JUL 1969

Pagination or Media Count : 71

Abstract : With the principal objective of developing a zinc negative with a cycle-life of at least 500, a number of structural, compositional, and operational variations were studied.. In the realm of structure and composition, the variations studied were: Teflon concentration; Teflon cure temperature; Mercury content; Lead content; Negatives wider and taller than positives; Zinc content; Cell size; Calcium hydroxide additive; Contoured negatives with and without superpressed periphery; and Use of fibers in dished center of plate and in the ZnO mix. The operational variations studied were: Charge cut-off voltage; and Long term wet stand. It was found that major improvements in cycle life resulted from incorporation and proper cure of Teflon and from the use of extended edges and contouring of the zinc negatives. Cycle life in excess of five hundred 62-1/2% depth of discharge cycles was obtained through the use of these modifications. (Author)

Descriptors :   *STORAGE BATTERIES, *ELECTRODES, *ALKALINE BATTERIES, ZINC, TEST METHODS, HYDROXIDES, SOLUBILITY, OXIDES, HALOCARBON PLASTICS, AGING(MATERIALS), FLUORINE COMPOUNDS, BINDERS.

Subject Categories : Electrochemical Energy Storage

Distribution Statement : APPROVED FOR PUBLIC RELEASE