Synthesis and Hydrogen Storage Properties of Li-Mg-N-H System

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  • Li-Mg-N-H系水素貯蔵材料の合成と水素吸放出特性
  • Li Mg N Hケイ スイソ チョゾウ ザイリョウ ノ ゴウセイ ト スイソキュウホウシュツ トクセイ

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 The Li-Mg-N-H system that is synthesized by the mechanical milling of Mg(NH2)2 and LiH is a material as the promising hydrogen media, because it is expected that it has the hydrogen capacity of about 5.5mass% in the operation temperature around 150～200℃. In this paper, we examined hydrogen absorption properties and cycling test for the mechanically milled mixture of 3Mg(NH2)2 and 8LiH, where the hydrogen desorption and absorption are performed at 200℃ under vacuum and 10MPa hydrogen respectively. As a result, it has been understood to be able to almost completely reabsorb the hydrogen in a condition of above absorption pressure, and to show an excellent reversibility after ten cycles. Moreover, even if the mixtures of MgH2 or Mg3N2 together with LiNH2 are used as raw materials, the same system as the Li-Mg-N-H hydrogen can be synthesized by heat-treatment for the mixtures at the temperature around 250～350℃ after a mechanical milling.

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