研究了CeMn0.25Al0.25Ni1.5+x(x=0.0,0.3,0.5,0.7,0.9,1.1)超化学计量比合金的相结构和电化学性能.XRD、SEM和电化学性能测试结果表明:CeMn0.25Al0.25Ni1.5+x (x=0.0,0.3,0.5,0.7,0.9,1.1)合金主要含有六方的CeAl相和立方的CeNi相,合金的粒径随x值的增大而变大.Ni的超化学计量比添加能够大大提高合金的电化学活性,298K时,合金的放电容量从x=0.0时的118.3 mAh/g提高到x=1.1时的200.7 mAh/g; 338 K时,其放电容量随x值增大呈先增后减的趋势,x=0.0合金的放电容量为170.4 mAh·g-1,当x=0.9时,放电容量出现最大值271.4 mAh/g.合金电极的P-C-T曲线表明:随Ni超化学计量的增加,合金的平衡氢压平台斜率变小,宽度增大,平衡氢压升高,这可能是使合金电极放电容量增加的主要原因.
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