LiAlH4/2LiNH2复合体系的储氢性能

Investigation on Hydrogen Storage Properties of LiAlH4/2LiNH2 Composite

摘要:

为了改善LiAlH4和LiNH2的储氢性能，将LiAlH4与LiNH2通过球磨制备成LiAlH4/2LiNH2复合储氢材料体系，采用X射线粉末衍射 (XRD) 仪、傅里叶红外光谱分析 (FTIR) 仪、同步热分析 (TG/DSC) 仪、核磁共振波谱分析 (NMR)仪等测试手段研究LiAlH4/2LiNH2复合储氢材料的储氢性能以及放氢过程的结构变化，分析了LiAlH4与LiNH2相互作用的机制。结果表明：LiNH2的加入改变了LiAlH4的放氢反应路径，有效地降低了LiAlH4的分解放氢温度，其放氢过程主要进行两步反应，最终产物为Li3AlN2。

Abstract:

In order to improve the hydrgen storage properties of LiAlH4 and LiNH2, LiAlH4/2LiNH2 composite was prepared by ball milling LiAlH4 and LiNH2 with a molar ratio of 1:2. The hydrogen storage properties and the microstructure change during dehydrogenation process were studied by using TG/DSC/MS, XRD, FTIR and NMR. Based on the hydrogen desorption properties and microstructure analysis, the dehydrogenation mechanism of LiAlH4/2LiNH2 composite was discussed. The experimental results show that the dehydrogenation reaction path of LiAlH4 is changed by addition of LiNH2, and the final product is Li3AlN2.