Edge effects on Li atom adsorption and migration of MoS2 zigzag nanoribbons

Edge effects on Li atom adsorption and migration of MoS2 zigzag nanoribbons
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MoS2锯齿形纳米带的边缘效应对Li原子吸附和迁移的影响

DOI:
10.1016/j.apsusc.2019.07.112
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发表时间:
2019-11
影响因子:
6.7
通讯作者:
Zhang Sheng Li
Zhang Sheng Li
中科院分区:
材料科学1区
文献类型:
--
作者:
Wen Yan Ni;Gao Peng Fei;Yang Hui Hui;Tian Xiao;Dang Wen Jia;Hu Cheng Xi;Zhang Sheng Li

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本文从第一性原理出发,研究了锯齿形MoS2纳米带的两个边缘,即S和Mo端对Li原子吸附和迁移的影响。 NR 的晶格常数与宽度有关。当单个或多个锂吸附原子结合到Mo原子的顶部并且当Li原子更靠近纳米带的边缘(特别是S末端边缘)时,其吸附能更强。对称的两侧吸附构型更适合多锂吸附原子形成。此外,最初吸附在S或Mo末端边缘的Li原子总是倾向于沿着其相应的边缘扩散。对于其他的,它们更喜欢向附近的 S 或 Mo 终端边缘扩散。这些结果表明,锯齿形MoS2纳米带可以显着增加Li结合能,同时为Li提供高迁移率路径。我们希望我们的理论研究能够启发锯齿形 MoS2 纳米带用作阴极材料的实验研究。
In this paper, the effects of the two edges, i.e., S and Mo terminals for zigzag MoS2nanoribbons, on Li atom adsorption and migration were studied from first principles. The lattice constants of NRs are width-dependent. The adsorption energy of single or multi-lithium adatoms is stronger when they are bound to the top of Mo atoms and when a Li atom is closer to the edge of a nanoribbon, particularly the S terminal edge. The symmetric two-sided adsorption configuration is more to form for multi-lithium adatoms. In addition, Li atoms initially adsorbed at the S or Mo terminal edge always prefer to diffuse along their corresponding edges. For other ones, they prefer to diffuse towards their nearby S or Mo terminal edge. These results indicate that zigzag MoS2nanoribbons can significantly increase the Li binding energy while providing a high mobility path for Li. We hope our theoretical studies will inspire experimental studies on zigzag MoS2nanoribbons for use as cathode materials.
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