1. Synergetic modulation on ionic association and solvation structure by electron-withdrawing effect for aqueous zinc-ion batteries.
- Author
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Rui Wang, Minjie Yao, Min Yang, Jiacai Zhu, Jun Chen, and Zhiqiang Niu
- Subjects
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ENERGY storage , *SOLVATION , *HYDROGEN evolution reactions , *EXCHANGE , *STORAGE batteries , *ARBITRAGE - Abstract
Aqueous zinc-ion batteries are emerging as one of the most promising large-scale energy storage systems due to their low cost and high safety. However, Zn anodes often encounter the problems of Zn dendrite growth, hydrogen evolution reaction, and formation of by-products. Herein, we developed the low ionic association electrolytes (LIAEs) by introducing 2, 2, 2-trifluoroethanol (TFE) into 30 m ZnCl2 electrolyte. Owing to the electron-withdrawing effect of -CF3 groups in TFE molecules, in LIAEs, the Zn2+ solvation structures convert from larger aggregate clusters into smaller parts and TFE will construct H-bonds with H2O in Zn2+ solvation structure simultaneously. Consequently, ionic migration kinetics are significantly enhanced and the ionization of solvated H2O is effectively suppressed in LIAEs. As a result, Zn anodes in LIAE display a fast plating/stripping kinetics and high Coulombic efficiency of 99.74%. The corresponding full batteries exhibit an improved comprehensive performance such as high-rate capability and long cycling life. [ABSTRACT FROM AUTHOR]
- Published
- 2023
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