ZnF2‐Riched Inorganic/Organic Hybrid SEI: in situ‐Chemical Construction and Performance‐Improving Mechanism for Aqueous Zinc‐ion Batteries

• Published in: Angewandte Chemie International Edition Vol. 62; no. 7; pp. e202216934 - n/a
• Main Authors: Xie, Dan, Sang, Yuan, Wang, Dan‐Hong, Diao, Wan‐Yue, Tao, Fang‐Yu, Liu, Chang, Wang, Jia‐Wei, Sun, Hai‐Zhu, Zhang, Jing‐Ping, Wu, Xing‐Long
• Format: Journal Article
• Language: English
• Published: Weinheim Wiley Subscription Services, Inc 06.02.2023
• Edition: International ed. in English
• Subjects: Aqueous electrolytes; Aqueous Zinc-Ion Batteries; Dendrite-Free Zn Anode; Dendrites; Electrolyte Additive; Hydrogen evolution; Interfacial Chemistry; Molecular structure; SEI Film; Zinc; Zinc fluorides; Zinc sulfate
• ISSN: 1433-7851; 1521-3773; 1521-3773
• DOI: 10.1002/anie.202216934

Uncontrolled dendrites growth and serious parasitic reactions in aqueous electrolytes, greatly hinder the practical application of aqueous zinc‐ion battery. On the basis of in situ‐chemical construction and performance‐improving mechanism, multifunctional fluoroethylene carbonate (FEC) is introduced into aqueous electrolyte to construct a high‐quality and ZnF2‐riched inorganic/organic hybrid SEI (ZHS) layer on Zn metal anode (ZMA) surface. Notably, FEC additive can regulate the solvated structure of Zn2+ to reduce H2O molecules reactivity. Additionally, the ZHS layer with strong Zn2+ affinity can avoid dendrites formation and hinder the direct contact between the electrolyte and anode. Therefore, the dendrites growth, Zn corrosion, and H2 evolution reaction on ZMA in FEC‐included ZnSO4 electrolyte are highly suppressed. Thus, ZMA in such electrolyte realize a long cycle life over 1000 h and deliver a stable coulombic efficiency of 99.1 % after 500 cycles. Multifunctional FEC is introduced into aqueous electrolyte to produce a ZnF2‐riched inorganic/organic hybrid SEI (ZHS) layer on Zn metal anode (ZMA) surface. The hydrolysate of FEC can favorably regulate the solvated structure of Zn2+ to restrict the H2O‐related parasitic reactions. The in situ formed ZHS layer not only realize uniform Zn deposition, but also suppresses ZMA corrosion.