摘要
The increasing demand for advanced energy storage solutions has driven extensive research into Zn-ion batteries due to their safety,cost-effectiveness,and environmental compatibility.This study presents a synthesis and evaluation of VO_(2)@VS_(2) hollow nanospheres as a novel cathode material for Zn-ion batteries.The VO_(2)@VS_(2) composite,synthesized via a one-step hydrothermal method,demonstrates a significant improvement in electrochemical performance.The material exhibits a reversible capacity of 468 mAh g^(-1) at 0.1 A g^(-1) and maintains a high capacity of 237 mAh g^(-1) at 1.0 A g^(-1) over 1000 cycles with a retention rate of 85%.Electrochemical analyses reveal enhanced charge transfer and Zn-ion storage,attributed to the synergistic effect and built-in electric field of the VO2 and VS2 heterostructure.Additionally,the composite shows superior electrochemical kinetics,facilitating rapid ion transport and charge transfer.In-situ Raman analysis confirms the reversible Zn-ion storage mechanism,further validating the composite’s structural stability during cycling.Density functional theory calculations further support these findings,indicating the composite’s potential for high-rate capability and long-term cycling stability.This research highlights the promise of VO_(2)@VS_(2) hollow nanospheres in advancing the performance of aqueous Zn-ion batteries.
基金
supported by the College Students’Innovation and Entrepreneurship Training Program of Qingdao University(Grant No.X2023110650038)
Guangdong Basic and Applied Basic Research Foundation(Grant No.2023B1515120003).
