Improvement of basic performances of a nickel-metal hydride battery |
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Authors: | Kohji Yuasa Munehisa Ikoma |
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Institution: | (1) Matsushita Battery Industrial Co., Ltd., I-I Matsushita-cho, Moriguchi, Osaka 570-8511, Japan |
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Abstract: | To develop a sealed-type nickel-metal hydride battery for use in portable equipment or in electric vehicles, investigations
were conducted on negative electrodes using AB5-type hydrogen storage alloy and positive electrodes. For the cycle life performance of the battery, alkaline treatment of
the alloy and the substitution of more than 50% to the alloy with Co were effective. For the positive electrode, zinc as a
solid solution in the nickel positive electrode obviously prevented γ-NiOOH from being formed in the charging process of β-Ni(OH)2 and suppressed the migration of the electrolyte solution in the separator to the active material of the positive electrode.
Also, hydrophobic treatment of the surface of the alloy was effective to prevent the elevation of the battery internal pressure
of the battery in high rate charge. |
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Keywords: | Nickel-metal hydride battery AB5-type hydrogen storage alloy performance |
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