Hierarchical 1D/2D V3S4@N, S-Codoped rGO Hybrids as High-Performance Anode Materials for Fast and Stable Lithium-Ion Storage

Vanadium sulfides, possessing high theoretical specific capacity and diverse structures, are regarded as attractive and promising anode materials for Li storage. Unfortunately, their practical applications are restricted by intrinsic drawbacks, like inferior structure stability, large volume variation, and even polysulfide dissolutions. Herein, we display a hierarchical one-dimensional/two-dimensional (1D/2D) hybrid material with 1D V3S4 nanofibers supported on 2D N, S-codoped graphene nanosheets and further unveil its electrochemical mechanism for Li-storage and origin of enhanced performance. When applied in LIBs, the optimized 1D/2D hybrid anodes deliver a stable capacity of 717 mA h g(-1) over 90 cycles at 100 mA g(-1), prolonged cycling stability over 1000 cycles at 1 A g(-1), and an excellent rate capability of 370 mA g(-1) at 5 A g(-1), which are superior to those of the pure V3S4 anode. Such structural design and engineering may provide inspiration for exploring other nanocomposites to achieve desired electrochemical performance.