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

The Korean Hydrogen and New Energy Society (한국수소및신에너지학회)
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Effects of the Surface Coating Treatment of Cathode Materials on the Electrochemical Characteristics of Ni-MH Secondary Batteries

양극 활물질의 표면 코팅처리가 Ni-MH 2차 전지의 전기화학적 특성에 미치는 영향

  • Kim, Byoung-Soub (Sebang Global Battery co. ltd.) ;
  • Yang, Dong-Cheol (Department of Materials Science and Engineering, Chonnam National University) ;
  • Park, Bong-Gi (Sebang Global Battery co. ltd.) ;
  • Park, Choong-Nyeon (Department of Materials Science and Engineering, Chonnam National University) ;
  • Park, Chan-Jin (Department of Materials Science and Engineering, Chonnam National University)
  • Received : 2011.06.13
  • Accepted : 2011.08.22
  • Published : 2011.08.30
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Abstract

The sealed nickel-metal hydride (Ni-MH) secondary battery are primarily used as energy storage for the HEV. But, the research on Ni-MH battery has focused on anode materials. In the present study, we investigate to improve the electrochemical characteristics of Ni-MH batteries using the surface treatment of $Ni(OH)_2$ cathode by CoOOH. Surface treated $Ni(OH)_2$ cathode showed significant improvement in the activation behavior, rate capability, charge retention, and cycle life of the batteries were significantly improved. In addition, the surface treated electrode exhibited the higher overvoltage for oxygen evolution than the untreated electrode. This phenomenon indicates that the charge efficiency can be improved by suppressing the oxygen evolution on cathode.

Keywords

References

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