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A self-assembled 2-hydroxyphosphonoacetic acid protective layer enables dendrite-free Zn anodes
Yingying Song1, Fengcan Ma2, Qinghua Xiao2
1School of Materials Science and Engineering, Shandong University of Technology, Zibo 255000, Shandong, China. hwang@sdut.edu.cn.
Abstract:
A stable self-assembled 2-hydroxyphosphonoacetic acid (HPAA) layer was constructed on the Zn surface via chelation. This HPAA protective layer significantly inhibits the water-related side reactions and suppresses Zn dendrite growth. Consequently, the Zn-HPAA-1h anode shows a long cycling lifetime of 650 h in a symmetric cell at 30.0 mA cm-2. Also, the Zn-HPAA-1h//V2O5 full cell demonstrates a high capacity of 154.1 mA h g-1 after 1000 cycles at 2 A g-1. This study provides a new strategy for developing dendrite-free Zn anodes.
