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Real-time visualization of Zn metal plating/stripping in aqueous batteries with high areal capacities

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Title
Real-time visualization of Zn metal plating/stripping in aqueous batteries with high areal capacities
Author(s)
Lee, S.; Kang, I.; Kim, J.; Kim, S.H.; Kisuk Kang; Hong, J.
Subject
Operando optical microscopy, ; SEI layer formation, ; Zn aqueous batteries, ; Zn dendrites
Publication Date
2020-10
Journal
JOURNAL OF POWER SOURCES, v.472, pp.228334
Publisher
ELSEVIER SCIENCE BV
Abstract
© 2020 Elsevier B.V.Zinc aqueous batteries have attracted great attention due to the earth abundance and the low redox potential of Zn metal. Utilizing Zn metal as an anode, however, causes low coulombic efficiency stemming from a dendritic Zn plating and formation of byproducts such as hydrogen gas, solid zinc hydroxide and salt-related compounds. One effective way of mitigating the issues is to modify the solvation structure of the electrolyte to increase the energy barrier of the water molecules for hydrolysis and electrolysis. Nevertheless, Zn aqueous batteries still indiscriminately utilize several types of electrolytes without elucidating the correlation between electrolyte composition and the electrochemistry of Zn metal. Here, we use operando optical microscopy to visualize the microstructural evolution of Zn metal, which strongly affects the electrochemical reversibility. In ZnSO4 electrolyte, large Zn platelets grow and form loose agglomerates vulnerable to unexpected delamination from the electrodes. In Zn(OTf)2 electrolyte, Zn platelets nucleate more homogeneously and grow smaller, which forms denser agglomerates enabling more stable cycling. We further reveal that the formation of a stable solid-electrolyte interphase layer holds the key to the excellent performance of acetonitrile-hybrid water-in-salt electrolytes. Our results show the necessity of designing proper electrolytes to develop long-life Zn aqueous batteries
URI
https://pr.ibs.re.kr/handle/8788114/8472
DOI
10.1016/j.jpowsour.2020.228334
ISSN
0378-7753
Appears in Collections:
Center for Nanoparticle Research(나노입자 연구단) > 1. Journal Papers (저널논문)
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