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 different folding conditions.