【摘要】 分别使用真空水冷锭模铸造法和真空速凝甩带法制备LaY₂Ni_9.7Al_0.3Mn_0.5合金,采用1148 K/16 h工艺进行热处理。XRD测试和Rietveld拟合发现:热处理后的铸锭合金主相为PuNi₃型,甩带薄片合金主相为Ce₂Ni₇型。用SEM观察合金形貌,结合能量散射谱（EDS）测定各相的组成,发现:经热处理后,铸锭的组织以及成分均匀程度不如甩带薄片。热处理后的甩带薄片,电化学性能优于铸锭合金。以0. 2 C充电420 min、放电至1. 0 V循环,最大放电比容量为366. 9 m Ah/g;以1. 0 C充电72 min进行倍率放电性能测试,3. 0 C放电至1. 0 V的比容量为230. 6 m Ah/g; 5. 0 C放电至0. 9 V的比容量为150. 3 m Ah/g;以1. 0 C充电72 min、放电至1. 0 V,循环300次的容量保持率为73%。更多还原

【Abstract】 LaY₂Ni_9.7Al_0.3Mn_0.5 alloy was prepared by vacuum water-cooled ingot mold casting method and vacuum rapid solidification stripping method,heat-treated by 1 148 K/16 h heat treatment process. Through XRD test and Rietveld fitting,it was found that the main phase of the ingot alloy after heat treatment was PuNi₃ type,the main phase of the strip flake alloy was Ce₂Ni₇ type. The morphology of the alloy was observed by SEM test,the composition of each phase was measured in combination with energy dispersive spectrometer（ EDS） test. It was found that the structure and composition of the ingot after heat treatment were not uniform. When charged at 0. 2 C for 420 min and discharged to 1. 0 V,the maximum discharge specific capacity of strip flake was 366. 9 m Ah/g; the rate discharge capability test was taken while charged at 1. 0 C for 72 min,when discharged at 3. 0 C to 1. 0 V,the specific capacity was 230. 6 m Ah/g; when discharged at 5. 0 C to 0. 9 V,the specific capacity was 150. 3 m Ah/g; when charged at 1. 0 C for 72 min and discharged to 1. 0 V,the capacity retention rate after 300 cycles was 73%.更多还原