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Visual observations on dissolution of La in LaCl_3-KCl and Nd in NdCl_3-KCl as well as La,Nd inKCl-NaCl melt respectively is first made by means of a see-through cell.It is found that black metal fog isformed as the dissolution of La,Nd in their melts.There is a little resistance to the dissolution and diffusion ofLa and Nd into their halide melts under electrolysis.The dissolution and diffusion rate of Nd in its halide melt ismt(?)h faster than that of La.The metal fog of La and Nd consists mainly of their lower valence ions and partiallyof metal particles. 相似文献
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高性能贮氢合金电极的成分设计 总被引:2,自引:0,他引:2
MH Ni电池的关键技术是负极材料———贮氢合金 ,而贮氢合金的性能主要取决于它的成分。从MH电极失效分析和MH Ni电池对负极材料的性能要求出发 ,详细讨论了AB5 型贮氢合金的各项性能与各种合金元素之间的关系 ,这些性能包括贮氢合金的吸氢量、平衡氢压、吸放氢滞后性、单胞体积和轴比c/a的大小、显微硬度、耐蚀性、高倍率放电性能及合金电极的温度特性等。同时对非化学计量比贮氢合金和低Co、无Co贮氢合金也进行了讨论。指出了合金成分设计应考虑的各个方面。 相似文献
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Effects of Strip Casting and Annealing on Electrochemical Properties of LPCNi3.55Co0.75Mn0.4Al0.3 Hydrogen Storage Alloys 总被引:3,自引:0,他引:3
The effect of thickness (1~10 mm) of the ingots on the electrochemical properties of as-cast and annealed strip cast LPCNi3.55Co0.75Mn0.4Al0.3 hydrogen storage alloys was investigated. It is found that the 0.2 C discharge capacity of as-cast LPCNi3.55Co0.75Mn0.4Al0.3 alloy increases with the increase of the thickness of the ingots. As-cast alloy with the thickness of 10 nun shows better activation property, higher 1C discharge capacity and better cyclic stability than others.It is mainly contributed to its larger unit cell volume and less internal stress. Annealed LPCNi3.55Co0.75Mn0.4Al0.3 alloywith the thickness of 3 mm shows much better comprehensive electrochemical properties than as-cast one; The cyclic stability of the alloy with the thickness of 6 mm and the activation properties of the alloys with the thickness of 3~6 mm are improved after annealing. It is mainly owing to the great release of intemal stress and the decrease fo the segregation of Mn in the alloys. 相似文献
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