VS2 nanoarchitectures assembled by single-crystal nanosheets for enhanced sodium storage properties

Crystallinity structure plays a key role in the rate capability and cycling performance for rechargeable battery. However, the effect of crystallinity structure on sodium storage properties of VS 2 hasn't been clearly elucidated. In this work, VS 2 nanoarchitectures comprised of the nanosheets with single-crystal or polycrystalline structure are respectively synthesized by a facile solvothermal method , and the influence of crystallinity structure on their sodium storage properties is revealed. It is found that the single-crystal structure can largely enhance the Na + intercalation kinetics in the crystal lattice and the structure stability during charge/discharge process. Therefore, the single-crystal VS 2 electrode exhibits an enhanced rate capability and cycling performance, delivering a high capacity of 193 and 172 mAhg −1  at a high rate of 0.5 and 1.0 Ag −1 , and 403 mAhg −1 after the following cycling test of 200 cycles at 0.2 Ag −1 . This work opens up new insights for the exploration and design of high-performance electrode materials for sodium-ion batteries.