系统研究了Co替代Ni对LaNi3.8型LaNi3.8-xCox(x=0.0,0.2,0.4,0.6)贮氢合金组织结构和电化学性能的影响.研究表明,所有合金都由LaNi5、Ce5Co19和Pr5Co19相组成.随着Co含量的增加,3个相的相丰度发生变化,而且单胞体积也相应的增加,这使得合金的放氢平台压降低到镍氢电池需要的范围(0.01～0.1 MPa).与LaNi3.8相比,含Co合金的循环性能得到改善.LaNi3.4Co0.4具有最大的放电容量,这一点与固态放氢量一致.LaNi3.6Co0.2倍率放电性能最好,具有最大的交换电流密度(Io)和最小的电荷转移电阻(Rct).
参考文献
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