Electrophoretic Mobilities of Cadmium Hydroxide, Nickel Hydroxide, and Silver Oxide in NiCd and Ag-Zn Battery Electrolytes.
AEROSPACE CORP EL SEGUNDO CALIF LAB OPERATIONS
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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 KOH battery electrolyte at several concentrations of K2CO3 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. Zeta potentials have been calculated from the data. Similar measurements have been made for nickel hydroxide suspensions in Ni-Cd battery electrolyte at several K2CO3 concentrations. The results are consistent with ion probe analyses for nickel in nylon separators exhibiting considerable cadmium migration. Silver oxide mobilty was also measured. Modified author abstract
- Physical Chemistry
- Electrochemical Energy Storage