An Improvement of the Characteristics of Pasted Cadmium Electrodes by Electrolytes in Ni/Cd Battery

Ni/Cd 전지에서 전해액에 의한 페이스트식 카드뮴 전극 특성 향상

  • Han, Min-Young (Department of Chemical Engineering, Chonnam National University) ;
  • Lee, Wan-Jin (Faculty of Applied Chemistry, Chonnam National University) ;
  • Lee, Woo-Tai (Department of Chemical Engineering, Chonnam National University) ;
  • Kim, Sun-Il (Department of Chemical Engineering, Chosun University) ;
  • Kim, Jin-Hwan (Department of Chemical Engineering, Chonnam National University)
  • Received : 1999.08.25
  • Accepted : 1999.11.01
  • Published : 1999.12.10

Abstract

The morphology changes of cadmium hydroxide into ${\gamma}$ phase by eletrolytes were carried out to improve the high rate charge and discharge efficiency of pasted cadmium electrodes. KOH solutions with different concentrations of NaOH were used as eletrolytes. It was found that the utilization of active material of cadmium electrode was the best in an electrolyte with 1.82 M NaOH. The amount of ${\gamma}-Cd(OH)_2$ increased in proportion to the concentration of NaOH. The surface area measurement showed that an active material which contained mainly ${\gamma}-Cd(OH)_2$ had a higher specific surface area than an active material of ${\beta}-Cd(OH)_2$. In a sealed cell, the discharge capacity was improved at high rate charge and discharge (1.0 C, 2.0 C) by using an electrolyte with NaOH. Furthermore, these improved performances were maintained up to 500 cycles at 1.0 C rate charge and discharge cycles.

Keywords

pasted cadmium electrode;structure;electrolyte;$Cd(OH)_2$ system

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