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Cobalt-free over-stoichiometric Laves phase alloys for Ni–MH batteries |
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| Affiliation: | a National Institute for Research and Development of Isotopic and Molecular Technologies, P.O. Box 700, R-3400, Cluj-Napoca, Romania b University of Arkansas at Little Rock, Applied Science Department, ETAS 575, 2801 S University Avenue, Little Rock, AR 72204, USA c University of Fribourg, Physics Institute, Perolles, CH-1700, Fribourg, Switzerland |
| Abstract: | The charge–discharge cycling behavior of the over-stoichiometric Laves phase alloy Zr0.75Ti0.25V0.9Mn0.4Cr0.3Ni1.4 as hydride electrode has been studied in a negative electrode-limited sealed cell. This cobalt-free alloy shows a maximum discharge capacity Cmax=373 mAh g−1 at 160 mA g−1 discharge current and a high rate dischargeability of 285 mAh g−1 at 1500 mA g−1 discharge rate. After 600 cycles the discharge capacity is 81% of the Cmax; the alloy also shows good charging efficiency (98%) and low temperature discharge rate. |
| Keywords: | Hydrogen absorbing materials Metal hydrides Electrode materials Electrochemical reactions |
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