High durable aqueous zinc ion batteries by synergistic effect of V6O13/ VO2 electrode materials

Vanadium oxides have attracted one's wide attention due to their diverse valences and spatial structure as cathode for aqueous zinc ion batteries. However, a strong electrostatic interaction exists between Zn ions and host materials, which leads to their sluggish reaction kinetics and inferior structural stability. Herein, we design a kind of vanadium-based electrode materials with abundant phase boundaries and oxygen defects. The assembled Zn//V6O13/VO2 batteries deliver a specific capacity of 498.3 mA h g-1 at 0.2 A g-1 and retain a capacity of 485.8 mA h g-1 after 100 cycles. Moreover, they achieve a retention rate of 96.8% after 5000 cycles at 10 A g-1. The soft pack cells also show excellent mechanical stability at dif-ferent folding conditions.CO 2023 Science Press and Dalian Institute of Chemical Physics, Chinese Academy of Sciences. Published by ELSEVIER B.V. and Science Press. All rights reserved.

Automated summary

In this study, a vanadium-based electrode material with abundant phase boundaries and oxygen defects was designed to improve the reaction kinetics and structural stability of aqueous zinc ion batteries. The assembled batteries showed high specific capacity and retention rate, and exhibited excellent mechanical stability.