An Improvement in the Properties of MH Electrode of Ni/MH Battery by the Copper Coating

Ni/MH 전지에서 Cu 도금에 의한 음극활물질의 전극 특성 향상

  • Cho, Jin Hun (Department of Chemical Engineering and Technology, Chonbuk National University) ;
  • Kim, In Jung (Department of Chemical Engineering and Technology, Chonbuk National University) ;
  • Lee, Yun Sung (Department of Chemical Engineering and Technology, Chonbuk National University) ;
  • Nahm, Kee Suk (Department of Chemical Engineering and Technology, Chonbuk National University) ;
  • Kim, Ki Ju (Department of Chemical Engineering and Technology, Chonbuk National University) ;
  • Lee, Hong Ki (Department of Chemistry, WooSuk University)
  • Received : 1996.07.08
  • Accepted : 1997.06.17
  • Published : 1997.08.10

Abstract

The effect of microencapsulation of maetal hydride (MH) with copper on the electrode performance of a Ni/MH battery has been investigated. The MH electrodes were prepared with a combination of cold press and paste methods. The discharge capacity of the electrode increased with an addition of small amounts if CMC into the electrode, but decreased when heat-treated in an oxygen-free nitrogen flow. The capacity of a Cu-coated $LaNi_5$ electrode was higher than that of LaNi5electrode. The discharge capacity of the electrode prepared with Cu-coated $LaNi_5$ increased with the increase of copper content in the electrode. It is considered that the increase of copper content enhanced the current density on the electrode surface, leading to the increase of the discharge capacity The MH electrode coated by an acidic electroless plating method showed much higher discharge capacity than that using an alkaline electroless plating method. The discharge capacity of the $LaNi_{4.5}Al_{0.5}$ electrode was higher than that of the $LaNi_5$ electrode. Also, the effect of microencapsulation on the deactivation of $LaNi_5$ was studied using an absorption-desorption cycle in CO-containing hydrogen.

Keywords

Acknowledgement

Supported by : 학술진흥재단

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