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研究了LaNi5-xFex(x=1.0,1.2,1.4,1.6,1.8)合金中Fe部分代替Ni对LaNi5型电极合金相结构及电化学性能的影响。结果表明:当x=1.0时,合金由LaNi5和La2Ni7相组成;当x=1.2时,开始出现(Fe,Ni)相;当x=1.6时,还开始出现La2Ni3相。随x增大LaNi5相逐渐减少、La2Ni7和(Fe,Ni)相逐渐增多。随Fe含量的增大,电极合金放电容量减小,扩散系数减小,交换电流密度呈先减小后增大的趋势,当x=1.4时,电极合金的交换电流密度达到最小值。Fe含量对合金电极高倍率放电性能HRD值的影响与对合金电极交换电流密度的影响趋势一致,这表明电极合金表面的电化学反应对合金的动力学性能影响更大。
The effects of partial substitution of Fe in LaNi5-xFex (x = 1.0,1.2,1.4,1.6,1.8) alloys on the phase structure and electrochemical properties of LaNi5 electrode alloys were investigated. The results show that when x = 1.0, the alloy consists of LaNi5 and La2Ni7 phases. When x = 1.2, the (Fe, Ni) phase begins to appear. When x = 1.6, La2Ni3 phase begins to appear. With the increase of x LaNi5 phase decreases gradually, La2Ni7 and (Fe, Ni) phase increases gradually. With the increase of Fe content, the discharge capacity of the electrode alloy decreases, the diffusion coefficient decreases, and the exchange current density first decreases and then increases. When x = 1.4, the exchange current density of the electrode alloy reaches the minimum value. The effect of Fe content on the HRD value of the high-rate discharge performance of the alloy electrode is consistent with the trend toward the exchange current density of the alloy electrode, indicating that the electrochemical reaction on the electrode alloy surface has a greater influence on the kinetic performance of the alloy.