【摘要】 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。更多还原

【Abstract】 The phase structures, thermodynamic properties and charge discharge performances of the alloys (Ml) x( Ni 3.8 Co 0.75 Mn 0.4 Ti 0.05 ) have been investigated. The results show that the alloys retain a single LaNi 5 phase for x <1 00. But a variety of secondary phases preciptate and the abundances of the secondary phases increase for x ≥1 00. The enthaply ( ΔH) of the hydride formation, unite cell volume of the alloy and plateau width of P C T curve increase with increasing x value, but the plateau pressure decreases. The discharge capacity reaches, a maximum value (307 7mAh/g) at x =1 00. The cyclical durability of the alloys with x <1 00 is better than that of the alloys with x ≥1 00.更多还原