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Boosting Zn Anode Utilization by Trace Iodine Ions in Organic‐Water Hybrid Electrolytes through Formation of Anion‐rich Adsorbing Layers by Kang Zhou; Zhi Li; Xuan Qiu; Zhuo Yu; Yonggang Wang is a Chemistry article available to read on EtoBox.

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## Abstract Aqueous Zn batteries are attracting extensive attentions, but their application is still hindered by H~2~O‐induced Zn‐corrosion and hydrogen evolution reactions. Addition of organic solvents into aqueous electrolytes to limit the H~2~O activity is a promising solution, but at the cost of greatly reduced Zn anode kinetics. Here we propose a simple strategy for this challenge by adding 50 mM iodine ions into an organic‐water (1,2‐dimethoxyethane (DME)+water) hybrid electrolyte, which enables the electrolyte simultaneously owns the advantages of low H~2~O activity and accelerated Zn kinetics. We demonstrate that the DME breaks the H~2~O hydrogen‐bond network and exclude H~2~O from Zn^2+^ solvation shell. And the I^−^ is firmly adsorbed on the Zn anode, reducing the Zn^2+^ de‐solvation barrier from 74.33 kJ mol^−1^ to 32.26 kJ mol^−1^ and inducing homogeneous nucleation behavior. With such electrolyte, the Zn//Zn symmetric cell exhibits a record high cycling lifetime (14.5 months) and achieves high Zn anode utilization (75.5 %). In particular, the Zn//VS~2~@SS full cell with the optimized electrolyte stably cycles for 170 cycles at a low N : P ratio (3.64). Even with the ca

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Author

Kang Zhou; Zhi Li; Xuan Qiu; Zhuo Yu; Yonggang Wang

Publisher

Wiley

Published

2023

Language

EN

Field

Chemistry (Physical Sciences)