Symmetry Donor–Acceptor Molecule Regulating Hydrogen-Bonding Network for Improved Metal Zinc Anode

作者：Yongkang Wang, Xiao Liu, Congcong Li, Cunxin Wang, Wenbin Li, Beibei Yang, Cunwang Ge, Hongbin Lu, Tao Qian, Duan Bin · 发表于：The Journal of Physical Chemistry Letters · 年份：2024 · DOI：10.1021/acs.jpclett.4c02538 · 被引用次数：3 · 研究领域：Advanced battery technologies research、Electrocatalysts for Energy Conversion、Advanced Battery Materials and Technologies

The issues of zinc dendrites and side reactions caused by active water molecules have seriously affected the development of aqueous zinc batteries (AZBs). Herein, a symmetry hydrogen-bond donor–acceptor molecule additive named 1,3-bis(hydroxymethyl)urea (BHMU) can preferentially adsorb on the anode surface and lock up water molecules through hydrogen bonding, thus isolating water molecules and reducing side reactions caused by active water molecules. With these advantages, the mixed electrolyte containing BHMU additive impels a reversible Zn anode with a high Coulombic efficiency (99.7% over 1000 cycles at 1 mA cm –2 ), while it also enables a stable symmetric cell operated at 1 mA cm –2 (1 mAh cm –2, 6.89% DOD Zn ) for 2250 h and 10 mA cm –2 (10 mAh cm –2, 68.9% DOD Zn ) for 350 h. More importantly, the Zn||PTO full battery also delivered superior cycling stability and higher capacity after 3000 consecutive 3000 cycles of circulation at 5 A g –1 . This study has great significance for the use of symmetry donor–acceptor molecules to modulate the solvation structure and the interface stability of the Zn anode in aqueous electrolytes.