Browse

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

Cited 2 time in Web of Science Cited 2 time in Scopus
Authors
Lee, Sechan; Kang, Inyeong; Kim, Jihyeon; Kim, So Hee; Kang, Kisuk; Hong, Jihyun
Issue Date
2020-10
Citation
Journal of Power Sources, Vol.472, p. 228334
Keywords
Zn aqueous batteriesOperando optical microscopyZn dendritesSEI layer formation
Abstract
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 solidelectrolyte 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.
ISSN
0378-7753
URI
https://hdl.handle.net/10371/171794
DOI
https://doi.org/10.1016/j.jpowsour.2020.228334
Files in This Item:
Appears in Collections:
College of Engineering/Engineering Practice School (공과대학/대학원)Dept. of Material Science and Engineering (재료공학부) Journal Papers (저널논문_재료공학부)
  • mendeley

Items in S-Space are protected by copyright, with all rights reserved, unless otherwise indicated.

Browse