Electrophoretic Mobilities of Cadmium Hydroxide, Nickel Hydroxide, and Silver Oxide in Ni‐Cd and Ag‐Zn Battery Electrolytes
- 1 February 1976
- journal article
- Published by The Electrochemical Society in Journal of the Electrochemical Society
- Vol. 123 (2) , 159-162
- https://doi.org/10.1149/1.2132777
Abstract
Since cadmium migration damage of separators is a major cause of Ni‐Cd battery failures or performance degradation, a series of electrophoretic mobility measurements has been made for cadmium hydroxide suspensions in concentrated battery electrolyte at several concentrations of to investigate whether electrophoresis of cadmium hydroxide could be the mechanism for migration to separators. It was found that the mobility of the cadmium hydroxide suspension in an applied electrical field is adequate to account for the observed migration of cadmium hydroxide to separators. The view that high carbonate concentrations in Ni‐Cd battery electrolyte may increase cadmium migration damage of separators is consistent with these electrophoretic measurements since it was demonstrated that increasing concentration from 0.8 to 6.2% increased cadmium hydroxide migration by a factor of 3. Zeta potentials have been calculated from the data. Similar measurements have been made for nickel hydroxide suspensions in Ni‐Cd battery electrolyte at several concentrations. The results are consistent with ion probe analyses for nickel in nylon separators exhibiting considerable cadmium migration. Silver oxide mobility reached a maxmum at 5.1% and declined at 15.8% .Keywords
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