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

The Korean Hydrogen and New Energy Society (한국수소및신에너지학회)
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Effect of the compacting additives on the Discharge Characteristics of the Negative Electrode for Ni-MH Battery

니켈-수소저장합금전지 음극의 방전특성에 미치는 성형첨가제의 영향

  • Jung, Jae-Han (Dept. of Materials Sci. & Eng., Kaist Advanced Institute of Science and Technology) ;
  • Lee, Han-Ho (Dept. of Materials Sci. & Eng., Kaist Advanced Institute of Science and Technology) ;
  • Kim, Dong-Myung (Dept. of Materials Sci. & Eng., Kaist Advanced Institute of Science and Technology) ;
  • Lee, Kee-Young (Dept. of Materials Sci. & Eng., Kaist Advanced Institute of Science and Technology) ;
  • Lee, Jai-Young (Dept. of Materials Sci. & Eng., Kaist Advanced Institute of Science and Technology)
  • 정재한 (한국과학기술원, 재료공학과) ;
  • 이한호 (한국과학기술원, 재료공학과) ;
  • 김동명 (한국과학기술원, 재료공학과) ;
  • 이기영 (한국과학기술원, 재료공학과) ;
  • 이재영 (한국과학기술원, 재료공학과)
  • Published : 1995.12.31
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Abstract

Negative electrode was prepared by mixing $Ti_{0.7}Zr_{0.3}Cr_{0.3}Mn_{0.3}V_{0.6}Ni_{0.8}$ alloy powder with copper or nickel powder and pressing in the air. The cycled electrodes were analyzed with SEM, potentiostat and electrochemical impedance spectroscopy. It was found that the Cu-compacted electrode showed better low temperature dischargeability and higher rate capability than Ni-compacted electrode. From SEM analysis of the cycled electrode compacted with copper powder, it was observed that the surface of MH particles was covered with copper grains and whisker precipitated from electrolyte after dissolution during cell test. It is found that the improved electrode characteristics are attributed to the copper layer on MH particles deposited by dissolution and precipitation(DP) process.

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