PVP decorated H3.78V6O13 microspheres assembled by nanosheets for aqueous zinc ion batteries at variable work temperature

As a kind of emerging energy storage devices, Aqueous zinc ion batteries possess the characteristics of safety, low cost and environmental friendliness. However, their further application is restricted by the sluggish electrochemical reaction kinetics and low conductivity. In this work, we prepare two H_3.78V₆O₁₃ electrode materials with many active sites, which promotes the kinetics of ion diffusion and then improves the capacity of the cell. The as-obtained HVO-PVP electrode possess a capacity of 393.2 and 285.9 mAh/g at 0.2 and 5.0 A/g, respectively. Moreover, the assembled Zn//HVO-PVP cells also indicate excellent specific capacity and cycle stability at different operating temperatures (0–60 °C).