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

The Korean Hydrogen and New Energy Society (한국수소및신에너지학회)
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Design of Additives and Electrolyte for Optimization of Electrode Characteristics of Ni-MH Secondary Battery at Room and Low Temperatures

Ni-MH 2차 전지의 상온 및 저온 전극특성 최적화를 위한 첨가제 및 전해질 설계

  • Yang, D.C. (Department of Materials Science and Engineering, Chonnam National University) ;
  • Park, C.N. (Department of Materials Science and Engineering, Chonnam National University) ;
  • Park, C.J. (Department of Materials Science and Engineering, Chonnam National University) ;
  • Choi, J. (Department of Materials Science and Engineering, Hanlyo University) ;
  • Sim, J.S. (Sebang Global Battery co. ltd.) ;
  • Jang, M.H. (Sebang Global Battery co. ltd.)
  • Published : 2007.12.15
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Abstract

We optimized the compositions of electrolyte and additives for anode in Ni-MH battery to improve the electrode characteristics at ambient and low temperatures using response surface method(RSM). Among various additives for anode, PTFE exhibited the greatest influence on the discharge capacity of the anode. Through response optimization process, we found the optimum composition of the additives to exhibit the greatest discharge capacity. When the amount of additives was too small, the anode was degraded with time due to the low binding strength among alloy powders and the resultant separation of powders from the current collector. In contrast, the addition of large amount of the additives increased in the resistance of the electrode. In addition, the discharge capacity of the anode at $-18^{\circ}C$ increased with decreasing the concentration of KOH, NaOH and LiOH in design range of electrolyte. The resistance and viscosity of electrolyte appear to affect the discharge capacity of the anode at low temperature.

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