Insights into the storage mechanism of VS4 nanowire clusters in aluminum-ion battery

As promising electrode materials for aluminum-ion batteries (AIBs), transition metal sulfides have attracted significant attention. However, the relative low energy density and poor rate property restrict their further applications. Herein, channels-rich VS4 nanowire clusters were synthesized via an amine ions-assisted method. When assessed as a cathode for rechargeable AIB, the VS4 nanowire clusters exhibit superior electrochemical performances, specifically, outstanding rate property (103.32 mAh g(-1) at 800 mA g(-1)), good cycling stability and a high reversible capacity of 252.51 mAh g(-1) (at 100 mA g(-1)). Moreover, ex-situ X-ray diffraction (XRD) and in-situ Raman techniques reveal that the as-prepared VS4 nanowire clusters have stable channels-rich structures, which is favorable for the mass transfer in electrochemical reaction. A mechanism of intercalation is proposed for the electrochemical process. This work takes a step toward the development of high-performance electrode materials for AIBs and provides new insights into the chemistry of AIBs for electrochemical energy storage.

Automated summary

Transition metal sulfides, as promising electrode materials for aluminum-ion batteries, have been hindered by their low energy density and poor rate property. This study successfully synthesized channels-rich VS4 nanowire clusters, demonstrating superior electrochemical performances as a cathode for rechargeable AIBs. The stable channels-rich structures of the VS4 nanowire clusters and proposed intercalation mechanism provide new insights into the chemistry of AIBs for electrochemical energy storage.