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首页> 外文期刊>Journal of Alloys and Compounds: An Interdisciplinary Journal of Materials Science and Solid-state Chemistry and Physics >Li_(3-x)M_xN (M=Co, Ni) synthesized by Spark Plasma Sintering for hydrogen storage
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Li_(3-x)M_xN (M=Co, Ni) synthesized by Spark Plasma Sintering for hydrogen storage

机译：放电等离子体烧结合成Li_（3-x）M_xN（M = Co，Ni）

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Lithium nitride has recently emerged as a promising material for hydrogen storage. The hydrogen storage capacity reaches 10.2 wt% H by the formation of compounds, such as imides, amides, and others. Hydro-genation of lithium nitride is highly exothermic, and thus desorbing hydrogen from these compounds requires high temperature and cannot be used for reversible hydrogen storage. Ab initio calculations predict that partial substitution of Li by transition metals like Cu or Ni can reduce the reaction enthalpy between amide and imide. In this work, we present the synthesis of the ternary system Li_(3-x)M_xN (M=Co or Ni) by Spark Plasma Sintering (SPS). The samples are hydrogenated at 255 °C by solid gas reaction. The sample crystal structures have been analyzed by synchrotron X-ray powder diffraction using a high resolution powder diffractometer. The structural models for Co and Ni-substituted Li_3N have been con?firmed. The effect of the substitution on the phase formation upon hydrogenation has been investigated at various metal and hydrogen concentration. Different behaviors are observed depending on the nature of M.
机译：氮化锂最近已成为有前途的储氢材料。通过形成诸如酰亚胺，酰胺等的化合物，储氢容量达到10.2wt％的H。氮化锂的氢化高度放热，因此从这些化合物解吸氢需要高温并且不能用于可逆的氢存储。从头算可以预测，Li被过渡金属（例如Cu或Ni）部分取代可以降低酰胺和酰亚胺之间的反应焓。在这项工作中，我们介绍了通过火花等离子体烧结（SPS）合成三元体系Li_（3-x）M_xN（M = Co或Ni）。样品通过固体气体反应在255°C下氢化。样品晶体结构已通过使用高分辨率粉末衍射仪的同步加速器X射线粉末衍射进行了分析。已经确认了Co和Ni取代的Li_3N的结构模型。在各种金属和氢浓度下，已经研究了取代对氢化时相形成的影响。根据M的性质观察到不同的行为。

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