Affiliation:
1. Key Laboratory of Advanced Energy Materials Chemistry (Ministry of Education), Renewable Energy Conversion and Storage Center, Haihe Laboratory of Sustainable Chemical Transformations, College of Chemistry, Nankai University, Tianjin 300071, People's Republic of China
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 ZnCl
2
electrolyte. Owing to the electron-withdrawing effect of -CF
3
groups in TFE molecules, in LIAEs, the Zn
2+
solvation structures convert from larger aggregate clusters into smaller parts and TFE will construct H-bonds with H
2
O in Zn
2+
solvation structure simultaneously. Consequently, ionic migration kinetics are significantly enhanced and the ionization of solvated H
2
O 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.
Funder
Ministry of Science and Technology of the People's Republic of China
National Natural Science Foundation of China
"Frontiers Science Center for New Organic Matter", Nankai University
Publisher
Proceedings of the National Academy of Sciences
Cited by
17 articles.
订阅此论文施引文献
订阅此论文施引文献,注册后可以免费订阅5篇论文的施引文献,订阅后可以查看论文全部施引文献