Al-doped α-nickel hydroxide electrode: addition of Co and effect of Al ion in electrolyte

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  • Choi Bokkyu
    Collaborative Research Center for Energy Engineering, Institute of Industrial Science, The University of Tokyo
  • Lee Sunmook
    Collaborative Research Center for Energy Engineering, Institute of Industrial Science, The University of Tokyo
  • Iizuka Masahiro
    Collaborative Research Center for Energy Engineering, Institute of Industrial Science, The University of Tokyo
  • Otsuji Yuichiro
    Collaborative Research Center for Energy Engineering, Institute of Industrial Science, The University of Tokyo
  • Fushimi Chihiro
    Collaborative Research Center for Energy Engineering, Institute of Industrial Science, The University of Tokyo
  • Tsutsumi Atsushi
    Collaborative Research Center for Energy Engineering, Institute of Industrial Science, The University of Tokyo

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タイトル別名
  • Al-Doped .ALPHA.-Nickel Hydroxide Electrode: Addition of Co and Effect of Al Ion in Electrolyte
  • Al doped a nickel hydroxide electrode addition of Co and effect of Al ion in electrolyte

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説明

The positive electrodes of nickel metal hydride (NiMH) batteries were doped with Al to improve the discharge capacity of NiMH batteries and its effects on the electrode performance were studied. Al-doped α-Ni(OH)2 electrodes were prepared by co-precipitation method. The characteristics of the positive electrode in KOH solution were investigated with charge/discharge cycles. The elution of doped Al into the electrolyte was observed as the number of charge/discharge cycles increased, which was confirmed by the ICP-AES analysis of the electrolyte after repeated charge/discharge cycles. This subsequently led to the decrease in the discharge capacity. However, it was found that the addition of Al ions into the electrolyte stabilized α-Ni(OH)2 and resulted in the increased discharge capacity.

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