Effect of Ti substitution on electrochemical properties of ZrNi alloy electrode for use in nickel-metal hydride batteries |
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Authors: | Akihiro Matsuyama Hironori Mizutani Takumi Kozuka Hiroshi Inoue |
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Affiliation: | 1. Advanced and High Functional Products Development Division, Aichi Steel Corporation, Tokai, Aichi 476-8666, Japan;2. Department of Applied Chemistry, Graduate School of Engineering, Osaka Prefecture University, Sakai, Osaka 599-8531, Japan |
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Abstract: | Crystal structure and electrochemical properties of the Zr1?xTixNi (0.05 ≤ x ≤ 0.5) alloys were investigated. X-ray diffraction spectra showed that the primary phase of all Zr1?xTixNi alloys had the B33-type orthorhombic crystal structure, which was characteristic of ZrNi, and the unit cell volume of the primary phase linearly decreased with an increase in the x value. In the charge–discharge tests with the Zr1?xTixNi alloy negative electrodes, the initial discharge curves for the alloys with x ≥ 0.3 had two plateaus. Both plateau potentials negatively shifted with an increase in the x value. The initial discharge capacity for the Zr0.6Ti0.4Ni alloy negative electrode was 349 mAh g?1 at 25 mA g?1 and 333 K, which was the highest in this study. The high-rate dischargeability and cycle performance were also improved by the partial replacement of Zr by Ti. |
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Keywords: | ZrNi Hydrogen storage alloy Negative electrode Nickel-metal hydride battery Ti substitution |
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