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Hydrated Intercalation for High-Performance Aqueous Zinc Ion Batteries

Cited 95 time in Web of Science Cited 100 time in Scopus
Authors
Shin, Jaeho; Choi, Dong Shin; Lee, Hyeon Jeong; Jung, Yousung; Choi, Jang Wook
Issue Date
2019-04
Citation
Advanced Energy Materials, Vol.9 No.14, p. 1900083
Keywords
aqueous batteriesdensity functional theoryhydrated intercalationvanadium oxidezinc
Abstract
Aqueous zinc ion batteries (AZIBs) are steadily gaining attention based on their attractive merits regarding cost and safety. However, there are many obstacles to overcome, especially in terms of finding suitable cathode materials and elucidating their reaction mechanisms. Here, a mixed-valence vanadium oxide, V6O13, that functions as a stable cathode material in mildly acidic aqueous electrolytes is reported. Paired with a zinc metal anode, this material exhibits performance metrics of 360 mAh g(-1) at 0.2 A g(-1), 92% capacity retention after 2000 cycles, and 145 mAh g(-1) at a current density of 24.0 A g(-1). A combination of experiments and density functional theory calculations suggests that hydrated intercalation, where water molecules are cointercalated with Zn ions upon discharge, accounts for the aforementioned electrochemical performance. This intercalation mechanism facilitates Zn ion diffusion throughout the host lattice and electrode-electrolyte interface via electrostatic shielding and concurrent structural stabilization. Through a correlation of experimental data and theoretical calculations, the promise of utilizing hydrated intercalation as a means to achieve high-performance AZIBs is demonstrated.
ISSN
1614-6832
URI
https://hdl.handle.net/10371/164641
DOI
https://doi.org/10.1002/aenm.201900083
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College of Engineering/Engineering Practice School (공과대학/대학원)Dept. of Chemical and Biological Engineering (화학생물공학부)Journal Papers (저널논문_화학생물공학부)
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