MATERIALS TRANSACTIONS
Online ISSN : 1347-5320
Print ISSN : 1345-9678
ISSN-L : 1345-9678
Effect on Electrochemical Properties of Phases in AB-Type Zr–Ti–Nb–Ni Alloys as Nickel-Metal Hydride Batteries
Akihiro MatsuyamaHironori TakitoTakumi KozukaTomoyuki TakemotoHiroshi Inoue
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2019 Volume 60 Issue 6 Pages 1083-1089

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Abstract

AB-type Zr–Ti–Nb–Ni alloys are good candidates as the negative electrode for Ni-metal hydride (MH) batteries because they have high discharge capacity around 330 mAh g−1 at 303 K. The Zr0.49Ti0.5Nb0.01Ni alloy consists of two phases, the primary-phase with B33-type orthorhombic structure and the secondary-phase with B2-type cubic structure. To compare electrochemical properties of each phase with the mother alloy, we synthesized the primary-phase and secondary phase alloys with compositions of Zr0.54Ti0.47Nb0.01Ni0.98 and Zr0.47Ti0.52Nb0.01Ni, respectively. The discharge capacity was examined at 25 mA g−1 and 303 K, showing that the primary-phase alloy has the highest value of 362 mAh g−1 than the mother alloy (335 mAh g−1) and the secondary-phase alloy (253 mAh g−1). For cycle performance, all alloys were excellent (≧95%) at 100 mA g−1 and 303 K. For high-rate dischargeability, the secondary-phase alloy was the best, probably because the stability of hydride for the secondary-phase alloy was lower than that for the mother and the primary-phase alloy.

Fig. 6 Discharge curve (1st cycle) for the Zr0.49Ti0.5Nb0.01Ni mother and the primary- and secondary-phase alloy negative electrodes at 25 mA g−1, 303 K. Fullsize Image
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© 2019 The Japan Institute of Metals and Materials
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