Abstract
In this work, we synthesized hollow multi-walled vanadium oxide nanotubes (VO x -NT) using a soft template technique under hydrothermal reaction conditions. By replacing organic templates, which do not contribute to electrochemical potassium storage, with K+ in a solution environment, we effectively retained the original hollow multi-walled structure of VO x -NT while obtaining the K-VO x -NT material. We conducted systematic characterizations of the microstructure, morphology, and composition of these materials and evaluated their potassium storage performance. Compared to the original VO x -NT, K-VO x -NT exhibited significantly enhanced cycling stability and rate performance when serving as the cathode in potassium-ion batteries (PIBs). It demonstrated a reversible discharge specific capacity of 75.7 mA h g-1 for the 1st cycle at a current density of 50 mA g-1 within a voltage range of 1.5-3.8 V (vs. K+/K) and retained 62.2 mA h g-1 after the 50th cycle. When a current density of 600 mA g-1 was applied, it could still deliver a capacity of 44.3 mA h g-1. Furthermore, the storage and degradation mechanisms of K+ in K-VO x -NT were elucidated. In addition, using hard carbon as the anode, the K-VO x -NT full-cell was tested to further evaluate its practical performance. This work provides insight into the design and modification of vanadium-based cathode materials for future PIBs.
Published Version
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call