Electrode/Electrolyte Interfacial Chemistry Modulated by Chelating Effect for High-Performance Zinc Anode
Chuanlin Li , Guangmeng Qu , Xixi Zhang , Chenggang Wang , Xijin Xu
Energy & Environmental Materials ›› 2024, Vol. 7 ›› Issue (3) : 12608
Although Zn metal has been regarded as the most promising anode for aqueous batteries, its practical application is still restricted by side reactions and dendrite growth. Herein, an in-situ solid electrolyte interphase (SEI) film formed on the interface of electrode/electrolyte during the plating/stripping of zinc anodes by introducing trace amounts of multidentate ligand sodium diethyldithiocarbamate (DDTC) additive into 1 M ZnSO4. The synergistic effect of in-situ solid electrolyte interphase forming and chelate effect endows Zn2+ with uniform and rapid interface-diffusion kinetics against dendrite growth and surface side reactions. As a result, the Zn anode in 1 M ZnSO4 + DDTC electrolytes displays an ultra-high coulombic efficiency of 99.5% and cycling stability (more than 2000 h), especially at high current density (more than 600 cycles at 40 mA cm−2). Moreover, the Zn//MnO2 full cells in the ZnSO4 + DDTC electrolyte exhibit outstanding cyclic stability (with 98.6% capacity retention after 2000 cycles at 10 C). This electrode/electrolyte interfacial chemistry modulated strategy provides new insight into enhancing zinc anode stability for high-performance aqueous zinc batteries.
chelating effect / in-situ SEI / ultra-high current density / Zn anodes
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2023 The Authors. Energy & Environmental Materials published by John Wiley & Sons Australia, Ltd on behalf of Zhengzhou University.
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