Affiliation:
1. State Key Laboratory Base of Eco‐Chemical Engineering International Science and Technology Cooperation Base of Eco‐chemical Engineering and Green Manufacturing Qingdao University of Science and Technology Qingdao 266042 P. R. China
2. College of Chemistry and Molecular Engineering Qingdao University of Science and Technology Qingdao 266042 P. R. China
3. Shandong Engineering Research Center for Marine Environment Corrosion and Safety Protection, College of Environment and Safety Engineering Qingdao University of Science and Technology Qingdao 266042 P. R. China
Abstract
AbstractInterface engineering attracted tremendous attention owing to its remarkable ability to impede dendrite growth and side reactions in aqueous zinc‐ion batteries. Artificial interface layers composed of crystalline materials have been extensively employed to stabilize the Zn anode. However, the diffusion kinetics of Zn2+ in highly crystalline materials are hindered by steric effects from the lattice, thereby limiting the high‐rate performance of the cell. Here, defect‐rich HfO2‐x polycrystals derived from metal‐organic frameworks (MOFs) (D‐HfO2‐x) are developed to enhance the Zn deposition behavior. The discrepancy of dielectric constants between metallic Zn and HfO2 enables the building of an electrostatic shielding layer for uniform Zn deposition. More importantly, the oxygen vacancies in D‐HfO2‐x provide abundant active sites for Zn2+ adsorption, accelerating the kinetics of Zn2+ migration, which contributes to the preferential exposure of the Zn (002) plane during plating. Consequently, the D‐HfO2‐x‐modified Zn anode delivers ultrastable durability of over 5000 h at 1 mA cm−2 and a low voltage hysteresis of 30 mV. The constructed defective coating provides a guarantee for the stable operation of Zn anodes, and the innovative approach of defective engineering also offers new ideas for the protection of other energy storage devices.
Funder
National Natural Science Foundation of China
Natural Science Foundation of Shandong Province
Subject
Biomaterials,Biotechnology,General Materials Science,General Chemistry