摘要
对Ｍｌ（Ｎｉ_(４．５５－ｘ)Ｍｎ_(０．４)Ｔｉ_(０．０５)）合金（ｘ＝０．０─０．８）的相结构、气态吸放氢特性及电化学性能进行了系统的研究．结果表明，在ｘ≤０．３的组成范围内，合金保持单一的 ＬａＮｉ_５相；当 ｘ＞０．３时，合金中析出多种第二相，且第二相总量随Ｃｏ含量的增加而增多．随合金Ｃｏ含量的增加，晶胞体积增大，吸放氢平台下降，滞后减小，但贮氢容量降低．在ｘ≤０．３的组成范围内，合金的 Ｃｏ含量增加提高了合金的放电容量和高倍率放电性能；当ｘ＞０．３时，合金的放电容量下降，但改善了合金的循环稳定性．
The phase structures, hydrogen absorption-desorption characteristics and electrio chemical performances of Ml(Ni_4.55-xCo_xMn_0.4Ti_0.05)(x=0.0-0.8)alloys are systematically studied. In the range of x≤0.3, the alloys keep single LaNi_5 phase. At x >0.3, a variety of secondary phases appears and the amount of the sencondary phases increases with the increase of Co content. It was found that the increase of Co content leads to the expansion of the cell volume and the decreases of the hysteresis, plateau pressure and the hydrogen capacity of alloys. As x ≤0.3, the increase of Co content results in the increment of the discharge capacity and high-rate dischargeability. At x >0.3, the discharge capacity decreases but the cycling durability is improved.
出处
《金属学报》
SCIE
EI
CAS
CSCD
北大核心
2000年第4期364-369,共6页
Acta Metallurgica Sinica
基金
国家863计划资助项目!715-004-0060
关键词
贮氢合金
金属氢化物电极
相结构
电化学性能
hydrogen storage alloy, hydride electrode, cobalt content, phase structure, electrochemical property
