材料科学
阳极
电解质
化学工程
电化学
锌
电池(电)
结晶
晶体生长
水溶液
电极
金属
卤化物
纳米技术
无机化学
结晶学
化学
冶金
功率(物理)
物理化学
工程类
物理
量子力学
作者
Shuo Jin,Duhan Zhang,Arpita Sharma,Qing Zhao,Yiqi Shao,Pengyu Chen,Jiaqi Zheng,Jiefu Yin,Yue Deng,Prayag Biswal,Lynden A. Archer
出处
期刊:Small
[Wiley]
日期:2021-07-06
卷期号:17 (33)
被引量:55
标识
DOI:10.1002/smll.202101798
摘要
Reversible electrodeposition of metals at liquid-solid interfaces is a requirement for long cycle life in rechargeable batteries that utilize metals as anodes. The process has been studied extensively from the perspective of the electrochemical transformations that impact reversibility, however, the fundamental challenges associated with maintaining morphological control when a intrinsically crystalline solid metal phase emerges from an electrolyte solution have been less studied, but provide important opportunities for progress. A crystal growth stabilization method to reshape the initial growth and orientation of crystalline metal electrodeposits is proposed here. The method takes advantage of polymer-salt complexes (PEG-Zn2+ -aX- ) (a = 1,2,3) formed spontaneously in aqueous electrolytes containing zinc (Zn2+ ) and halide (X- ) ions to regulate electro-crystallization of Zn. It is shown that when X = Iodine (I), the complexes facilitate electrodeposition of Zn in a hexagonal closest packed morphology with preferential orientation of the (002) plane parallel to the electrode surface. This facilitates exceptional morphological control of Zn electrodeposition at planar substrates and leads to high anode reversibility and unprecedented cycle life. Preliminary studies of the practical benefits of the approach are demonstrated in Zn-I2 full battery cells, designed in both coin cell and single-flow battery cell configurations.
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