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arXiv 1703.07643cond-mat.mtrl-sci
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硼氢化物作为钙、镁、钠或锂离子存储阳极材料的第一性原理研究

Borophene as an anode material for Ca, Mg, Na or Li ion storage: A first-principle study

B Mortazavi, A Dianat, O Rahaman, G Cuniberti, T Rabczuk

摘要:

硼氢化物是石墨烯的硼原子类似物,具有原子厚度,最近才通过实验制造出来。在这项工作中,我们采用第一性原理密度泛函理论计算研究的Ca,Mg,Na或Li原子与单层和独立的硼化物的相互作用。我们首先确定了最稳定的结合位点及其相应的结合能,然后逐渐增加离子浓度。我们的计算预测硼化物衬底和Ca,Mg,Na或Li离子之间的结合能分别为4.03 eV,2.09 eV,2.92 eV和3.28 eV。我们发现,结合能一般随离子含量的增加而降低。使用Bader电荷分析,我们评估的吸附原子和硼氢化物片之间的电荷转移。我们的研究提出硼氢化物作为2D材料,对于Ca、Mg、Na或Li离子存储分别具有约800 mAh/g、1960 mAh/g、1380 mAh/g和1720 mAh/g的显著高容量。本研究为硼氢化物在可充离子电池中的应用提供了依据。

英文摘要:

Borophene, the boron atom analogue to graphene, being atomic thick have been just recently experimentally fabricated. In this work, we employ first-principles density functional theory calculations to investigate the interaction of Ca, Mg, Na or Li atoms with single-layer and free-standing borophene. We first identified the most stable binding sites and their corresponding binding energies as well and then we gradually increased the ions concentration. Our calculations predict strong binding energies of around 4.03 eV, 2.09 eV, 2.92 eV and 3.28 eV between the borophene substrate and Ca, Mg, Na or Li ions, respectively. We found that the binding energy generally decreases by increasing the ions content. Using the Bader charge analysis, we evaluate the charge transfer between the adatoms and the borophene sheet. Our investigation proposes the borophene as a 2D material with a remarkably high capacity of around 800 mAh/g, 1960 mAh/g, 1380 mAh/g and 1720 mAh/g for Ca, Mg, Na or Li ions storage, respectively. This study can be useful for the possible application of borophene for the rechargeable ion batteries.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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