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为了降低镍氢电池的原材料成本 ,研究了一系列多元、低钴和无钴AB5型贮氢合金 ,以及取代元素对贮氢合金电化学性质的影响。结果显示 ,用少量的铁、铜和铬部分取代贮氢合金La(NiMnCoAl) 5中的钴对改善贮氢合金电化学循环稳定性有效。贮氢合金La(NiMnAl) 4.6(FeCuCr) 0 .2 Co0 .2 具有满意的循环稳定性 ,它在 0 .2C放电条件下的最大放电容量为 2 96mAh/g-1,经过 30 0次循环容量衰减仅 2 1.8%。另外 ,还用X射线衍射检测了贮氢合金的微观结构
In order to reduce the raw material costs of nickel-metal hydride batteries, a series of multicomponent, low-cobalt and cobalt-free AB5-type hydrogen storage alloys and the effect of substituted elements on the electrochemical properties of hydrogen storage alloys were studied. The results show that the partial replacement of cobalt in La (NiMnCoAl) 5 with a small amount of iron, copper and chromium is effective in improving the electrochemical cycling stability of the hydrogen storage alloy. The hydrogen storage alloy La (NiMnAl) 4.6 (FeCuCr) 0.2 Co0.2 has a satisfactory cycle stability, its maximum discharge capacity is 0.296mAh / g-1 at 0.2C discharge, and after 300 cycles capacity Attenuation is only 2 1.8%. In addition, the microstructure of the hydrogen storage alloy was also examined by X-ray diffraction