Rose-like VS 2 Self-Assembled from Nanosheets with Superior Sodium Storage Performance

Recently, sodium ion batteries (SIBs) have exhibited great application potential in the area of renewable energy storage. However, developing anodes for SIBs with excellent cycling stability and high capacity is a great challenge. In recent years, VS 2 attracts more attention due to its high specific capacity. In this work, three-dimensional (3D) rose-like VS 2 self-assembled from nanosheet was prepared via a solvothermal method using N-methylpyrrolidone as the solvent. The special 3D structure facilitates electron/Na + transport and can relieve the volume change during Na + insertion/extraction. Benefitting from the 3D self-assembled structure, VS 2 exhibits outstanding cycling stability at high current density. Even when tested at 5 A g −1 , the 3D VS 2 electrode can maintain a high capacity of 565 mA h g −1 after 350 cycles. Through pseudo-capacitance contribution calculation, we speculate that the high capacitance contribution confers the superior high rate performance to the VS 2 . This work sheds a new light on the design and preparation 3D VS 2 , which can be utilized as an excellent anode for SIBs.