Molecule-Adsorption-Induced Interface Micro-environment Regulating for Highly Stable Aqueous Zinc Ion Batteries
Jinlong Zhang, Xueyao Wei, Qing Wu, Xiude Liu, Song Yang, Fusheng Luo, Zeyu Yan, Jun Huang, Yiwang Chen
Abstract
High Resolution Image Download MS PowerPoint Slide Irreversible Zn plating/stripping and uncontrollable interface micro-environment fluctuation induced by competitive side reactions in the electrical double layer limit the reversibility of aqueous zinc ion batteries (AZIBs). Here, we propose the molecule-adsorption-induced interface micro-environment regulating the electrical double layer (EDL) to stabilize Zn electrode/electrolyte interface electrochemistry by adding the Ellagic acid (Ea) electrolyte. Specially, the preferential adsorption of Ea on the Zn (002) facet creates a unique physical barrier interface on the Zn surface via the strong interaction between the Ea molecule and Zn anode. The Ea-molecule-induced adsorption layer could simultaneously act as a H 2 O/H + -shielding interphase for suppressing side reactions and promoting homogeneous Zn 2+ transport for compact Zn (002) deposition. As a result, Zn//Zn symmetric cells demonstrated outstanding lifespans that cycled over 300 h under the periodic changes of current densities from 1 to 20 mA cm –2, and the Zn//Cu half cell delivered high Coulombic efficiency (99.53%) during 1000 cycles at 5 mA cm –2 with 1 mAh cm –2 . Furthermore, the Zn//MnO 2 full cells preserved 72.9% capacity even after 2000 cycles at 2 A g –1 . This strategy opens a unique understanding of the relationship between electrical double layer regulation and highly efficient AZIBs.