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对 (Ml) x(Ni3.8Co0 .75Mn Ti0 .0 5)合金 (x =0 .90～ 1 .1 0 )的相结构 ,热力学性能及合金电极的充放电性能进行了研究。结果表明 :在 x <1 .0 0的成分范围内 ,合金保持单一的 La Ni5相 ;当 x≥ 1 .0 0时 ,合金中析出多种第二相 ,且总量随 x的增加而增多。随着 x的增加 ,合金的晶胞体积及氢化物生成焓 (-ΔH )增大 ,吸放氢平台压力降低 ,宽度增加。合金的最大放电容量在 x =1 .0 0 时达到最大值 (30 7.7m Ah/g)。x <1 .0 0 合金的循环稳定性优于 x≥ 1 .0 0 合金。
The phase structure, thermodynamic properties and charge-discharge performance of (Ml) x (Ni3.8Co0.75Mn Ti0.050) alloy (x = 0.90-1.100) were studied. The results show that the alloy maintains a single phase of LaNi5 within the composition range of x <1.0. When x≥1.0O, multiple second phases are precipitated in the alloy, and the total amount increases with the increase of x . With the increase of x, the unit cell volume and hydride formation enthalpy (-ΔH) of the alloy increase, and the pressure on the hydrogen absorption and desorption platform decreases and the width increases. The maximum discharge capacity of the alloy reaches its maximum value (30 7.7m Ah / g) at x = 1.0. The cycle stability of x <1.0 alloy is better than that of x≥1.0 alloy.