Suppression mechanism of the self-discharge reaction in nickel-metal hydride batteries using a sulfonated polyolefin separator |
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Authors: | Katsuhiko Shinyama Yasuyuki Harada Reizo Maeda Hiroshi Nakamura Shigeki Matsuta Toshiyuki Nohma Ikuo Yonezu |
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Affiliation: | (1) Mobile Energy Company, Sanyo Electric Co., Ltd., 7-3-2 Ibukidai-higashimachi, Nishi-ku, Kobe, Hyogo 651-2242, Japan |
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Abstract: | The suppression mechanism of the self-discharge reaction in nickel-metal hydride batteries using a sulfonated polyolefin separator was investigated with sealed-type AA size cells. The experimental results indicate that a sulfonated polyolefin separator effectively suppresses the self-discharge reaction in nickel-metal hydride batteries by trapping nitrogen-containing redox shuttle substances. It is also found that a sulfonated polyolefin separator traps the shuttle substances as gaseous ammonia. In the experiment examining the influence of the amount of the shuttle substances on the self-discharge, the starting point of the self-discharge agreed well with the point at which the nitrogen adsorption capacity of a sulfonated polyolefin separator reached its maximum. |
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Keywords: | Nickel-metal hydride battery self-discharge storage characteristics sulfonated separator redox shuttle reaction |
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