Analysis of the Activation Mechanism of Hydrogen Storage Alloy Negative Electrodes Containing Palladium Ion-Adsorbed Carbon Powder

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  • MORISHITA Shinya
    Toyota Central Research and Development Laboratories, Inc.; 41-1 Yokomichi, Nagakute, Aichi 480-1192 Japan
  • FUJITA Katsuyoshi
    Toyoda Automatic Loom Works, Ltd.; 2-1 Toyoda-cho, Kariya-shi 448-8671 Japan
  • ITOH Kazuhiko
    Toyota Central Research and Development Laboratories, Inc.; 41-1 Yokomichi, Nagakute, Aichi 480-1192 Japan
  • TOWATA Shin-ichi
    Toyota Central Research and Development Laboratories, Inc.; 41-1 Yokomichi, Nagakute, Aichi 480-1192 Japan
  • ABE Katsushi
    Toyota Central Research and Development Laboratories, Inc.; 41-1 Yokomichi, Nagakute, Aichi 480-1192 Japan

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Other Title
  • パラジウムイオンを吸着したカーボン粉末を含む水素吸蔵合金負極の活性化機構の解析

Abstract

In the case of Ni-MH batteries, the initial activation of the hydrogen storage alloy negative electrodes was promoted by adding palladium ion-adsorbed carbon powder(Pd2+/C). From electrochemical impedance analysis of the negative electrodes, and TEM observation and XRD measurement of Pd2+/C after cathodic polarization, the mechanism of this phenomenon was presumed to be as follows: <br> 1) Palladium ion is reduced to fine palladium particles during the first charge. <br> 2) The fine palladium particles act as active sites for charge/discharge reactions.<br> 3) Pulverization of the alloy particles occurs due to volume expansion by the hydrogen absorption into the alloy, and new active sites are formed on the fresh alloy surface. <br> 4) Therefore, the promotion of the initial activation of the negative electrode is observed by addition of Pd2+/C.

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