电解质
阳极
法拉第效率
阴极
材料科学
化学工程
无机化学
水溶液
溶剂化
电极
乙腈
溶剂
化学
有机化学
物理化学
工程类
作者
Hainan Zhao,Qiang Fu,Xianlin Luo,Xiaoyu Wu,Sylvio Indris,Marina Bauer,Yizhan Wang,Helmut Ehrenberg,Michael Knapp,Yingjin Wei
标识
DOI:10.1016/j.ensm.2022.05.048
摘要
A cathode/anode compatible aqueous zinc triflate electrolyte is proposed by reorganizing the solvation structure of the electrolyte using an acetonitrile co-solvent. Acetonitrile notably alters the hydrogen bonds of the electrolyte, reducing the activity of water. Using this electrolyte, a ZnǁV2O5 full-cell exhibits high Coulombic efficiency, long cycle life and high rate capability. The interactions between electrolyte, cathode and Zn anode are clarified based on comprehensive in operando and ex situ experiments and molecular dynamics simulations. The addition of acetonitrile does not change the bulk ion storage of V2O5, but the unique electrode-electrolyte interfacial films with specific compositions and spatial distribution protect the Zn and V2O5 electrodes and improve the interfacial kinetics of the electrodes, thus significantly promoting the cycling performance of the full cell. This cathode/anode compatible electrolyte can overcome the challenges of both the cathode and anode which would promote aqueous rechargeable zinc batteries into practical application.
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