非化学计量比贮氢合金Ml(Ni0.71Co0.15Al0.06Mn0.08)x 的电化学性能
来源期刊：中国有色金属学报2000年第5期
论文作者：李全安 桑革 李建文 陈云贵 涂铭旌
文章页码：659 - 662
关键词：贮氢合金； 金属氢化物电极；稀土合金； 电化学性能
Key words：hydrogen storage alloy; metal hydride electrode; rare earth alloy; electrochemical property
摘 要：研究了化学配比x 对贮氢合金Ml(Ni0.71 Co0.15 Al0.06 Mn0.08)x(4.6≤x ≤5.2)的结构、 组织、 电化学性能和 p-c-T 特性的影响。 结果表明， 随着x 增大非化学计量比合金点阵常数 a 值减小， c 值增大， 单胞体积减小， 当x =5.2时 c/a 达到最大值。 x =5.0的化学计量比合金具有最小的点阵常数和单胞体积。放电容量、 充放电循环稳定性和 p-c-T 曲线平台压均随着x 增大而提高， 当x =5.2时达到最大放电容量和最佳循环稳定性。
Abstract: Effect of stoichiometry on phase structures， electrochemical properties and p-c-T characteristics of Ml(Ni0.71Co0.15 Al0.06Mn0.08)x (Ml=lanthanumrich michmetal， 4.6≤ x ≤5.2) alloys have been investigated. The lattice constants a， c ， and cell volumes of nonstoichiometric alloys are bigger than those of the stoichiometric alloy. The value of a decreases， the values of c andcell volume increase with increasing value of x except for those of the stoichiometric alloy. The plateau pressure of p-c-T curve， discharge capacities and cycling stability all increase with increasing value of x . The alloy with x =5.2 hasthehighest discharge capacity and the best cycling stability among the studied alloys.
