Analysis of the behavior of Zn atoms with a Pb additive on the surface during Zn electrodeposition
Analysis of the behavior of Zn atoms with a Pb additive on the surface during Zn electrodeposition
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DOI：
10.1016/j.elecom.2022.107291
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发表时间：
2022-05
影响因子：
5.4
通讯作者：
Yusuke Onabuta;Masahiro Kunimoto;Fumimasa Ono;Y. Fukunaka;H. Nakai;G. Zangari;T. Homma
中科院分区：
文献类型：
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作者：
Yusuke Onabuta;Masahiro Kunimoto;Fumimasa Ono;Y. Fukunaka;H. Nakai;G. Zangari;T. Homma
锌作为用于大规模下一代储能的后锂二次电池的有效阳极材料引起了广泛关注。使用铅等金属添加剂可以有效抑制充电过程中电极的不良形态变化。通过在原子水平上研究 Pb 存在下沉积的 Zn 的行为，可以获得更有效的添加剂。本研究研究了添加 Pb 的 Zn 电沉积的形态和结构特征。恒电流电沉积表明，在 Pb 存在下，独特的柱状 Zn 生长，其在六方密堆积 (hcp) 结构中朝向 (0001)，其侧壁朝向 hcp-(0–110) 结构。电沉积的 Zn 被 Pb(1 1 1) 顶层覆盖。密度泛函理论计算表明沉积的 Zn 原子可以穿透 Pb 顶层到达作为表面活性剂的 Zn 底层，从而证实了这种层结构。此功能允许支柱不断生长。了解此类沉积原子的行为还可以深入了解添加剂的一般效果和工作机制。
Zn has attracted considerable attention as an effective anode material in post-Li secondary batteries for large-scale, next-generation energy storage. The use of metal additives such as Pb is effective in suppressing undesirable morphological changes in the electrode during charging. More efficient additives can be obtained by investigating the behavior of deposited Zn in the presence of Pb at the atomic level. This study investigates the morphological and structural characteristics of Zn electrodeposition with the addition of Pb. Galvanostatic electrodeposition indicates that distinctive pillar-like Zn grows in the presence of Pb, which is oriented to (0001) in the hexagonal close-packed (hcp) structure, with its side wall oriented toward the hcp-(0–110) structure. The electrodeposited Zn is covered by a top layer of Pb(1 1 1). Density functional theory calculations confirm this layer structure by showing that the deposited Zn atoms can penetrate the Pb top layer to reach the Zn underlayer as a surfactant. This feature allows pillars to grow continuously. Understanding the behavior of such deposited atoms also provides insights into the effects and working mechanisms of additives in general.