RE-Mg-Ni基A6B24型超晶格负极材料结构及贮氢性能：多元合金优化调控微观组织

A6B24结构是新近发现一种RE-Mg-Ni基超晶格物相，由A6B24相组成的RE-Mg-Ni基A6B24型负极材料具有较高的循环寿命和优良的吸放氢动力学特征，是极具希望的新一代高容量贮氢合金电极材料，然而目前该类材料微观结构特性、贮氢性能等尚不清楚，丞待解决。. 本项目拟从A6B24相微观结构特征研究入手，通过元素优化对RE-Mg-Ni基A6B24型超晶格材料的微观组织结构进行调控，研究合金化对RE-Mg-Ni基A6B24型材料组织结构、贮氢性能的影响以及合金中的多相复合效应，构建A6B24型合金热力学性能预测模型，阐明元素替代对合金吸放氢膨胀行为影响以及对微观组织结构和贮氢性能的作用机制。在此基础上提出合金优化途径，为高容量MH/Ni电池负极材料开发与应用提供理论依据。

The superlattice rare earth–Mg–Ni-based A6B24-type phase described as a 4:1 stacking of the same units has been newly reported. These alloy materials with A6B24 structure have received attention as negative a promising generation electrode materials for advanced nickel-metal hydride because of good cycle life, excellent absorption/desorpotion kinetics character. however, Some problems such as microstructure character hydrogen storage performance of the A6B24-type intermetallics are still unknown and need to be solved.. The project commences from the research of A6B24 phase microstructure characteristics, then the effects of hydrogen storage performance and structure together with multi-phase compounding which are controlled through the element optimization have been investigated, aiming to build A6B24 type alloy thermodynamic performance prediction model, how substitution of element affect microstructure, hydrogen storage properties and hydrogen absorption/desorption expansion behaviour, base on which we may come up with a method to optimize the alloy. the research can provide practic theory support for newly developed high-performance RE-based hydrogen storage electrode alloy material.