Cation‐Structure Effects on Zinc Electrodeposition and Crystallographic Orientation in Ionic Liquids
Cation‐Structure Effects on Zinc Electrodeposition and Crystallographic Orientation in Ionic Liquids
复制标题
离子液体中阳离子结构对锌电沉积和晶体取向的影响
DOI：
10.1002/celc.202200016
复制
发表时间：
2022
期刊：
影响因子：
4
通讯作者：
Arai Susumu
中科院分区：
文献类型：
--
作者：
Shimizu Masahiro;Sugiyama Yusuke;Horita Masaomi;Yoshii Kazuki;Arai Susumu
研究了N-丙基-N-甲基吡咯烷鎓（Pyr 1，3+）和1-乙基-3-甲基咪唑鎓（EMI+）与双（三氟甲磺酰基）酰胺（TFSA-）组成的室温离子液体中Zn沉积的电化学行为.阳离子结构的影响不仅在宏观形态上，而且在从[Zn（TFSA）2]0.1[Cation-TFSA]0.9获得的Zn沉积物的晶体取向的微观方面上进行了检查。电子背散射衍射显示，在0.5 mA cm− 2的电流密度下，Pyr 1，3-TFSA中生长的晶粒比EMI-TFSA中的晶粒尺寸细得多。 这可能是因为Pyr 1，3阳离子抑制了Zn吸附原子的表面扩散，从而阻止了在特定平面方向上的生长。结果表明，要获得较高的退锌可逆性，需要较大的晶粒尺寸，而不是晶粒细小的多晶。所获得的结果将大大有助于实现更长的寿命电池使用锌没有资源限制。
The electrochemical behavior of Zn deposition in room temperature ionic liquids consisting of bis(trifluoromethanesulfonyl)amide (TFSA−) combined withN‐propyl‐N‐methylpyrrolidinium (Pyr1,3+) or 1‐ethyl‐3‐methylimidazolium (EMI+) was investigated in terms of their physicochemical properties and dissolved Zn2+species. The effect of cation structure was examined not only on the macroscopic morphologies, but also on the microscopic aspects of crystallographic orientation of Zn deposits obtained from [Zn(TFSA)2]0.1[Cation‐TFSA]0.9. Electron backscattered diffraction revealed that the crystal grains grown in Pyr1,3‐TFSA at the current density of 0.5 mA cm−2were much finer, compared with the sizes of those in EMI‐TFSA. This is probably because Pyr1,3cations inhibit the surface diffusion of Zn adatoms, thus preventing growth in a specific plane direction. It was found that higher reversibility on Zn stripping needs larger crystal grains rather than polycrystalline with fine grains. The obtained results will contribute greatly to the realization of longer life batteries using Zn without resource constraints.