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Mg(NH_2)_2-2LiH体系储氢材料具有较高的储氢容量和较适宜的热力学性能,并且其吸放氢过程完全可逆,是目前最有望实现大规模应用的固态储氢材料之一。然而,由于该体系在吸放氢过程中具有较高的动力学壁垒,导致其在200℃以上才能实现快速地吸放氢。因此,国际上对该体系储氢材料的研究主要集中在热力学和动力学的调控方面。本文从成分调变、纳米化和掺杂改性等方面,详细综述了Mg(NH_2)_2-2LiH体系储氢材料热力学和动力学调控的研究现状,并提出了其中存在的问题和相应对策,同时指出了将来的研究方向。
The Mg (NH_2) _2-2LiH hydrogen storage material has high hydrogen storage capacity and more suitable thermodynamic properties, and its hydrogen absorption and desorption processes are completely reversible, which is one of the most promising solid-state hydrogen storage materials for large-scale applications. However, due to its high kinetic barrier in the process of hydrogen absorption and desorption, the system can rapidly absorb and desorb the hydrogen above 200 ° C. Therefore, the international research on hydrogen storage materials in this system mainly focuses on the thermodynamics and kinetics. In this paper, the research status of thermodynamics and kinetics of hydrogen storage materials in Mg (NH_2) _2-2LiH system is reviewed in detail from the aspects of composition modulation, nanocrystallization and doping modification. The existing problems and corresponding countermeasures are put forward. At the same time pointed out the future research direction.