采用真空电弧熔炼和925 ℃/12 h退火的方法制备了Y_1-xLa_xNi_3.25Al_0.15Mn_0.15储氢合金（x=0~1）,研究了x值对储氢合金物相组成和电化学性能的影响。结果表明,x=0和0.15的储氢合金主要由LaNi₅和Ce₂Ni₇相组成,x=0.25、0.33和0.5储氢合金主要由Ce₅Co₁₉和Ce₂Ni₇相组成,x=0.75和1储氢合金主要由PuNi₃、LaNi₅和Ce₂Ni₇相组成;相同充放电循环周次下,x=0.15~1储氢合金的放电容量和抗氢致非晶化能力都高于x=0储氢合金,且随着x从0增加至1,储氢合金的最大放电容量（C_max）、容量保持率（S₁₀₀）、氢扩散系数（D₀）和高倍率放电性（HRD₉₀₀）都呈现先增加后减小趋势,在x=0.33时取得C_max、S₁₀₀、D₀和HRD₉₀₀最大值。Y_1-xLa_xNi_3.25Al_0.15Mn_0.15储氢合金的循环稳定性与合金电极的耐腐蚀性密切相关,高倍率放电性能取决于储氢合金的氢扩散速率。

Y_1-xLa_xNi_3.25Al_0.15Mn_0.15 hydrogen storage alloy（x=0~1） was prepared by vacuum arc melting and annealing at 925 ℃ for 12 h.The effect of x value on the phase composition and electrochemical properties of hydrogen storage alloy was studied.The results showed that hydrogen storage alloys with x=0 and 0.15 were mainly composed of LaNi₅ and Ce₂Ni₇ phases;hydrogen storage alloys with x=0.25,0.33 and 0.5 were mainly composed of Ce₅Co₁₉ and Ce₂Ni₇ phases;hydrogen storage alloys with x=0.75 and 1 were mainly composed of PuNi₃,LaNi₅ and Ce₂Ni₇ phases;under the same charge discharge cycle,the discharge capacity and anti hydrogen induced amorphization ability of hydrogen storage alloy with x=0.15~1 were higher than that of hydrogen storage alloy with x=0,and with the increase of x value from 0 to 1,C_max,S₁₀₀,D₀ and HRD₉₀₀ of hydrogen storage alloy increased at first and then decreased,and the maximum values of C_max,S₁₀₀,D₀ and HRD₉₀₀ were obtained at x=0.33.The cycle stability of Y_1-xLa_xNi_3.25Al_0.15Mn_0.15 hydrogen storage alloy was closely related to the corrosion resistance of the alloy electrode, and the high rate discharge performance depended on the hydrogen diffusion rate of the hydrogen storage alloy.