本文研究了非化学计量比混合稀土-镍系贮氢合金MmBx的配比数x对合金结构、热力学性能和金属氢化物（MH）电极充放电性能的影响。随着配比数x的减小，合金晶胞体积和金属氢化物生成焓（─ΔH）增加，平台压力降低且与配比x有lnpeq=1．99x-11．13的关系．当x＜5．0时，合金在CaCu5型主相之外析出Cc2Ni7第二相，该第二相具有较高的电催化活性．x＜5．0时，合金电极具有较高的初容量和活化性能．在x=4．8时．合金最大放电容量为274.7mA．h／g．
The effects of nonstoichiometric ratio x on the structure, thermodynamic properties for the alloys MmBx (Mm=mischmetal, B=Ni0.72Mn0.08Co0.14Al0.06, x=4.2 - 5.5) and the charge-discharge performances of metal hydride electrodes were investigated. With x value decreasing, the unite cell volumes and the enthalpy (-ΔAH) of hydride formation increased. The relationship of plateau pressure and x of the alloys can be expressed as Inpeq= 1. 99 2x - 11. 131. Asx<5.0, the second phase Ce2Ni7 with high electrocatalytic activity segregated in small numbers in the alloys. The electrodes of nonstoichiometric alloys (x<5.0) had more capacity and superior activation than those of MmB5 and MmB5.5. At x=4.8, the nonstoichiometric alloy electrode had the maximum capacity of 274.7 mA.h/g.
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