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http://dx.doi.org/10.5229/JKES.2003.6.4.242

A Study on the Effect of Electrolyte Additives on Zn Electrode with Pb3O4 in Zn-AgO Secondary Battery System  

Park, Kyung-Wha (Department of Material Engineering, Korea Maritime University)
Moon, Kyung-Man (Department of Mechanical & Materials Engineering, Korea Maritime University)
Publication Information
Journal of the Korean Electrochemical Society / v.6, no.4, 2003 , pp. 242-249 More about this Journal
Abstract
Zn electrode was widely used as an anode material in alkaline battery systems in highly concentrated KOH electrolyte, however it was well known that its cycle life is significantly shortened by growth of dendrite due to the high dissolution of $Zn(OH)_2$ and rapid electrochemical reaction. In this study when by the additives such as $Ca(OH)_2$, Citrate, tartrate and Gluconate were added to $40\%$ KOH electrolyte at solution temperature of $25^{\circ}C$ and the amount of $5wt\%\;Pb_3O_4$ was mixed to Zn electrode and then the effect of $Pb_3O_4$ and additives on the electrochemical behavior of Zn electrode was investigated by Potentiodynamic Polarization Curves, Cyclic Voltammetry, Accelerated Life Cycle lest, and SEM image analyses. The addition of $Pb_3O_4$ reduced the corrosion rate of Zn electrode. The corrosion potential of Zn electrode with $Pb_3O_4$ was higher or lower than that of pure Zn electrode however was not influenced practically to the open circuit voltage. And the addition of 4 type additives had an important role in improving both cycle life in accelerated cycle life test and corrosion resistance. Furthermore the additive of Tartrate indicated comparatively a good effect to corrosion resistance as well as charging-discharging property Improvement among those four type additives.
Keywords
Zn electrode; Additives; Cyclic voltammetry; Corrosion resistance; Accelerated cycle life test.;
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