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

The Korean Hydrogen and New Energy Society (한국수소및신에너지학회)
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The Effect of Rolling on the Charge-Discharge Characteristic of Metal Hydride Electrode for Ni-MH Secondary Battery

압연이 Ni-MH 2차전지용 금속수소화물 전극의 충·방전 특성에 미치는 영향

  • Park, Won (Dept. of Metallurgical Eng., Chonnam National University) ;
  • Chang, Sang-Min (Dept. of Metallurgical Eng., Chonnam National University) ;
  • Choi, Seung-Jun (Dept. of Metallurgical Eng., Chonnam National University) ;
  • Noh, Hak (Automobile Research Center, Chonnam National University) ;
  • Choi, Jeon (Dept. of Iron & Metallurgical Eng., Hanlyo Sanup University) ;
  • Park, Choong-Nyeon (Dept. of Metallurgical Eng., Chonnam National University)
  • 박원 (전남대학교 금속공학과) ;
  • 장상민 (전남대학교 금속공학과) ;
  • 최승준 (전남대학교 금속공학과) ;
  • 노학 (전남대학교 자동차 연구소) ;
  • 최전 (한려산업대학교 제철금속학과) ;
  • 박충년 (전남대학교 금속공학과)
  • Published : 1996.12.31
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Abstract

The effect of rolling on the charge-discharge property was studied for metal hydride negative electrode. $(LM)Ni_{3.6}Al_{0.4}Co_{0.7}Mn_{0.3}$(pleateau pressure : below 1 atm at room temperature, volume expansion : 9%, entalpy : $8.7kcal/molH_2$) alloy was prepared by arc melting, and then it was coated with various copper weight percent. The copper coated alloys were then rolled with the different reduction ratio. From the results, it was found that the maximum discharge capacity increased with increasing reduction ratio, and 15wt% copper coated sample shows the highest discharge capacity, 324mAh/g, after rolling with 30% reduction ratio. In view of cycle life for the negative electrode, the 15wt% copper coated electrode which was rolled with 13% reduction ratio showed the longest cycle life compared with other electrodes.

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