La-Y-Ni系无镁超点阵结构AB3.0-3.8型多元合金储氢行为及电化学性能研究

探索新型储氢合金负极材料是发展大容量及高功率镍氢电池的关键和基础。最近研究表明，新型La-Y-Ni系无镁超点阵结构合金的储氢和电化学性能不仅可与R-Mg-Ni系超点阵结构合金相媲美，而且可完全避免高温冶金制备R-Mg-Ni系合金时由于金属镁极易挥发所引发的安全隐患及合金成分难以控制等突出问题。本项目选取La1-xYx(Ni,M)3.0-3.8(M=Co,Mn,Al,Fe)超点阵结构合金体系为研究对象，拟采用多种实验和分析方法，分析合金微观组织与相结构演化规律，研究合金气体吸放氢和电化学循环过程中结构、性能变化规律及其关联，探讨合金成分-结构-储氢行为与电化学性能之间的内在联系，以期搞清影响合金储氢行为和电化学性能的关键因素。本项目内容将丰富和发展新型稀土超点阵结构储氢合金体系的研究，为研发具有实用价值的高容量与长寿命La-Y-Ni系超点阵结构储氢合金电极材料奠定坚实的实验及理论基础。

Exploring the new type hydrogen storage alloy anode material is the key and foundation to develop high energy density and high power Ni-MH batteries. Recent some studies have shown that the hydrogen storage and electrochemical properties of the novel La-Y-Ni-based Mg-free superlattice structure alloys can be comparable to those of the R-Mg-Ni-based alloys, meanwhile fabrication of the alloys can avoid the security risks and the difficulty of alloys composition control caused by very volatile metal magnesium in the preparation of high temperature metallurgy for R-Mg-Ni-based alloys. In this project, we will select new type superlattice structural alloys La1-xYx(Ni, M)3.0-3.8(M=Co, Mn, Al, Fe) as the research object and study the evolution of microstructure and phase structure, regulation and relationships between structure and performance in the gaseous hydrogen absorption/desorption and electrochemical cycle process of the alloys by various experiments and analysis methods. On the basis of above, we will explore the fundamental relationships between the composition, structure, hydrogen storage behavior and electrochemical properties to find out the key factors that influence the hydrogen storage behavior and electrochemical properties of the alloys. The above research work will enrich and promote development of the new type rare earth superlattice structure hydrogen storage alloy system, which also lay a solid experimental and theoretical basis for the development of high capacity and long-life La-Y-Ni-based Mg-free superlattice structure alloy electrode materials in future.