Scanning electron microscope study of porous zinc battery electrode oxidation after service-like exposures in potassium hydroxide electrolyte.
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Authors
Savory, John Robert
Subjects
zinc anode
porous electrode
shape change
alkaline battery
oxidation product morphology
potassium hydroxide electrolyte
zinc dendrite
porous electrode
shape change
alkaline battery
oxidation product morphology
potassium hydroxide electrolyte
zinc dendrite
Advisors
Perkins, J.
Date of Issue
1977-06
Date
Publisher
Monterey, CA; Naval Postgraduate School
Language
en_US
Abstract
Porous zinc battery electrodes were modeled for study of the oxidation products that are produced during discharge in an alkaline battery. Two- and three-dimensional pore models were used in the study. The electrodes were discharged galvanostatically in electrolyte solutions of potassium hydroxide. Oxidation product morphology was studied with a scanning electron microscope. Two types of oxidation product were observed. One type appeared to form directly on the electrode surface as the result of reaction between the zinc and the electrolyte. This product was dark colored and fairly complete on passivated surfaces. The other type of product was light colored and incomplete. It appeared as a second layer, usually found on top of the darker product. This second type of product appears to precipitate out of solution at passivation. Strong pitting of the zinc base metal accompanies the production of oxidation product.
Type
Thesis