Transactions of the Korean hydrogen and new energy society (한국수소및신에너지학회논문집)

The Korean Hydrogen and New Energy Society (한국수소및신에너지학회)
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Electrochemical Properties of the AB2-type Metal Hydride Electrode Prepared by Ball Milling

Ball milling한 AB2계 금속수소화물 전극의 전기화학적 특성

  • Choi, Seung-Jun (Dept. of Metallurgical Eng., Chonnam National University) ;
  • Shim, Jong-Su (Dept. of Metallurgical Eng., Chonnam National University) ;
  • Oh, Se-Ung (Dept. of Metallurgical Eng., Chonnam National University) ;
  • Noh, Hak (Dept. of Metallurgical Eng., Chonnam National University) ;
  • Choi, Jeon (Dept. of Iron & Metallurgical Eng., Hanlyo Sanup University) ;
  • Seo, Chan-Yeol (Dept. of Metallurgical Eng., Chonnam National University) ;
  • Park, Choong-Nyeon (Dept. of Metallurgical Eng., Chonnam National University)
  • 최승준 (전남대학교 금속공학과) ;
  • 심종수 (전남대학교 금속공학과) ;
  • 오세웅 (전남대학교 금속공학과) ;
  • 노학 (전남대학교 금속공학과) ;
  • 최전 (한려산업대학교 제철금속학과) ;
  • 서찬열 (전남대학교 금속공학과) ;
  • 박충년 (전남대학교 금속공학과)
  • Published : 1997.12.15
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Abstract

The electrochemical properties of the $AB_2$-type (Zr-Ti-V-Ni-Cr-Co-Mn) metal hydride electrodes prepared by ball milling with $AB_5-type\{(LM)Ni_{3.6}Al_{0.4}Co_{0.7}Mn_{0.3}\}$(LM : Lanthanum-rich mischmetal) alloy powder as a surface activator were investigated. By ball milling with $AB_5$ type alloy powder, the activation of $AB_2$ type metal hydride electrode was accelerated resulting in an increase of discharge capacity from 35% to 85% of the maximum capacity at the first cycle. As the amount of surface activator increased the activation rate increased, whereas the discharge capacity increased with 10wt% and decreased with 20wt% addition of the surface activator. When the amount of the surface activator was kept constant as 10wt%, the discharge capacity and the activation rate increased with ball milling time up to 20 hours. However beyond 20 hours of ball milling time, they decreased drastically due to the nano-crystallization or amorphorzation of the alloy powder.

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