【摘要】 对贮氢合金Ｍ１Ｎｉ３３．５５＋ｘＣｏ０．７５Ａｌ０．３Ｍｎ０．４（０≤ｘ≤０．６）的结构、组织、电化学性能和Ｐ－Ｃ－Ｔ特性进行了研究。结果表明，除了ｘ＝０．６的合金外，随着ｘ的增大合金的点阵常数ａ值减小、ｃ值增大，ｃ／ａ值和单胞体积也随之增大，而ｘ＝０．６时合金体积反而减小。同时随着ｘ的增大，合金中Ｎｉ并没有出现明显偏析，而是促进了Ｂ侧其它合金元素尤其是Ｍｎ和ＡＩ的偏析。ｘ的增大，放电容量降低，充放电循环稳定性只略有下降，但活化性能却明显改善，Ｐ－Ｃ－Ｔ曲线平台压升高。更多还原

【Abstract】 The phase structures, electrochemical properties and PCT characteristics of MlNi3.55+xCo0.75Al0.3 Mn0.4 (Ml= Lanthanumrich Michmetal, 0≤x≤0.6) alloys have been investigated. The value of lattice constant a decreases, the value of lattice constant c and cell volume increase with the increasing value of x except for the alloy with x=0.6. The discharge capacities and cycling stability decrease, activity is greatly improved and the plateau pressures of PCT curve increases with the increasing value of x. Increasing value of x facilitates segregation of Mn, Al elements, but does not obviously affect segregation of Ni element.更多还原