为了提升汽车电池负极用RENi_3.2Mn_0.2Al_0.15储氢合金（RE为复合稀土Y_1-x La _x ）的电化学性能，采用真空电弧熔炼法制备RENi_3.2Mn_0.2Al_0.15储氢合金，考察了稀土Y_1-x La _x 复合添加及x值对储氢合金相结构、显微形貌和电化学性能的影响。结果表明，RENi_3.2Mn_0.2Al_0.15储氢合金在x=0、0.15时由LaNi₅+Ce₂Ni₇型相组成，在x=0.25、0.33和0.50时由Ce₅Co₁₉+Ce₂Ni₇型相组成，在x=0.75和1.00时由PuNi₃+LaNi₅+Ce₂Ni₇型相组成。不同类型的物相在扫描电镜下呈现不同的衍射衬度，扫描电镜显微形貌观察结果与X射线衍射谱图测试结果保持一致。x=0~1.00时储氢合金的活化次数介于2~4次；随着x从0增加至1.00，储氢合金中Ce₂Ni₇型相丰度、放电容量和循环100次时的容量保持率（S₁₀₀）先增大后减小，在x=0.33时取得Ce₂Ni₇型相丰度最大值（93.07%）、放电容量最大值（372.6 mA·h/g）和S₁₀₀最大值（89.01%），储氢合金的放电容量变化趋势与Ce₂Ni₇型相丰度变化趋势相同。储氢合金电极的腐蚀电流密度（i）与S₁₀₀负相关，表明储氢合金的耐腐蚀性能是影响循环性能的主要因素；储氢合金的氢扩散系数（D₀）与高倍率放电性能（HRD₉₀₀）正相关，表明储氢合金的高倍率放电性能由氢的扩散速率决定。

In order to improve the electrochemical performance of RENi_3.2Mn_0.2Al_0.15 hydrogen storage alloy（RE is a composite rare earth Y_1-x La _x ） for automotive battery anodes，RENi_3.2Mn_0.2Al_0.15 hydrogen storage alloy was prepared by vacuum arc melting method，the effects of rare earth Y_1-x La _x composite addition and x value on the phase structure，morphology and electrochemical performance of the hydrogen storage alloy were investigated.The results indicated that when x=0 and 0.15，the hydrogen storage alloy was mainly composed of LaNi₅ and Ce₂Ni₇ phases.When x=0.25，0.33，and 0.50，the hydrogen storage alloy was mainly composed of Ce₅Co₁₉ type and Ce₂Ni₇ type phases.When x=0.75 and 1.00，hydrogen storage alloys were mainly composed of PuNi₃ type，LaNi₅ type，and Ce₂Ni₇ type phases.Different types of phases exhibited different diffraction contrast under scanning electron microscopy，and the microscopic morphology observed by scanning electron microscopy was consistent with the X-ray diffraction pattern test results.When x=0~1.00，the activation frequency of hydrogen storage alloys was ranged from 2 to 4 times.As x was increased from 0 to 1.00，the abundance of Ce₂Ni₇ phase，discharge capacity，and capacity retention rate at 100 cycles（S₁₀₀） in the hydrogen storage alloy showed trend of firstly increased and then decreased.At x=0.33，the maximum abundance of Ce₂Ni₇ phase（93.07%），maximum discharge capacity（372.6 mA·h/g），and maximum S₁₀₀ value（89.01%） were obtained.The trend of discharge capacity change in the hydrogen storage alloy was consistent with that of Ce₂Ni₇ phase abundance.The corrosion current density i of hydrogen storage alloy electrodes was negatively correlated with S₁₀₀，indicating that the corrosion resistance of hydrogen storage alloys was the main factor affecting cycling performance.The hydrogen diffusion coefficient D₀ of hydrogen storage alloys was positively correlated with HRD₉₀₀，indicating that the high rate discharge performance of hydrogen storage alloys was determined by the diffusion rate of hydrogen.