【摘要】 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La Ni₅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Pu Ni₃、La Ni₅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。更多还原

【Abstract】 Y_1-xLa_xNi_3.25Al_0.15Mn_0.15hydrogen 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 La Ni₅and Ce₂Ni₇phases;hydrogen storage alloys with x=0.25,0.33 and 0.5 were mainly composed of Ce₅Co₁₉and Ce₂Ni₇phases;hydrogen storage alloys with x=0.75 and 1 were mainly composed of Pu Ni₃,La Ni₅and Ce₂Ni₇phases;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,D₀and HRD₉₀₀of hydrogen storage alloy increased at first and then decreased,and the maximum values of C_max,S₁₀₀,D₀and HRD₉₀₀were obtained at x=0.33.The cycle stability of Y_1-xLa_xNi_3.25Al_0.15Mn_0.15hydrogen 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.更多还原