LiBH4、MgH2和AlH3具有高的储氢容量，但其吸放氢条件尚不能满足实际应用的要求。本项目将LiBH4-MgH2-AlH3复合形成三元复合储氢材料，通过研究不同组成的复合物的吸放氢性能，以及不同吸放氢阶段产物结构的演变规律，揭示复合物的吸放氢机理；研究复合物的吸放氢循环性能，阐明其吸放氢容量衰退机制；阐明催化剂对LiBH4-MgH2-AlH3复合储氢性能影响；研究微波辐射加热对该复合体系的放氢过程的影响，获取和积累必要的基础数据及信息，最终优化复合物的组成，为进一步提高复合体系综合性能提供理论依据。本项目的完成对于其他复合储氢体系吸放氢机制的研究具有指导作用，具有重要的学术价值和良好的应用前景。

LiBH4, MgH2 and AlH3 show high hydrogen storage capacity, however, their hydriding / dehydriding conditions can not meet the requirements of practical applications. In this project, LiBH4-MgH2-AlH3 ternary composites are formed by ball-milling the mixture of LiBH4, MgH2 and AlH3, and the hydriding / dehdriding properties are studied, the evolution of microstructures of the composite during every hydriding / dehydriding steps are analyzed. The aims of this project are to clarify the hydriding / dehdriding mechanism of LiBH4-MgH2-AlH3 ternary composites, to clarify their cycling degradation mechanism. Moreover, the effects of catalysts on the hydrogen storage properties are investigated, and the effects of microwave irradiation on the dehydriding reaction routine and mechanism are studied. Based on the above results, we try to obtain the basic data and information, and to find a new way to improve the hydrogen storage properties these composites. The fullfilment of this project is helpful for the design of new hydrogen storage composites, and are also good references for the study of other composites. This work has important academic interesting and good prospective for application.