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Superionicity in the hydrogen storage material Li_2NH: Molecular dynamics simulations

机译:储氢材料Li_2NH中的超离子性:分子动力学模拟

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We have employed ab initio molecular dynamics simulations in an attempt to study a temperature-induced order-disorder structural phase transformation that occurs in Li_2NH at about 385 K. A structural phase transition was observed by us in the temperature range 300-400 K, in good agreement with experiment. This transition is associated with a melting of the cation sublattice (Li~+), giving rise to a superionic phase, which in turn is accompanied by an order-disorder transition of the N-H bond orientation. The results obtained here can contribute to a better understanding of the hydrogen storage reactions involving Li_2NH and furthermore broaden its possible technological applications toward batteries and fuel cells.
机译:我们采用了从头算分子动力学的模拟方法,试图研究温度诱导的有序-无序结构相变,该结构相变发生在Li_2NH约385 K处。我们在300-400 K的温度范围内观察到了结构相变。与实验良好的协议。这种转变与阳离子亚晶格(Li +)的熔化有关,产生超离子相,而超离子相又伴随着N-H键取向的有序-无序转变。此处获得的结果可有助于更好地理解涉及Li_2NH的储氢反应,并进一步扩大其在电池和燃料电池中的可能技术应用。

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