Graphene-supported bimetal phosphorus trisulfides as novel 0D–2D nanohybrid for high rate Li-ion storage

Herein, we report on the synthesis and Li-ion storage properties of the 0D–2D nanohybrid consisted of bimetal phosphorus trisulfides nanoneedles (Co_0.5Ni_0.5PS₃) and graphene nanosheets (denoted as Co_0.5Ni_0.5PS₃@G). By choosing the Co_0.5Ni_0.5(OH)₂ nanoneedles as precursor, the Co_0.5Ni_0.5PS₃ derived by a simple solid-state transformation (SST) process was successfully attached onto the graphene surface. The as-prepared nanohybrids showed a superior cycling stability and rate performance for Li-ion storage. After cycling at a current density of 0.5 A g⁻¹ for 500 cycles, the capacity are 456 mA h g⁻¹. Particularly, the capacity can reach 302 mAh g⁻¹ at a current density of 10 A g⁻¹, which is 66.2% of the capacity at 0.5 A g⁻¹. Even cycling at a current density of 50 A g⁻¹, the nanocomposite can still kept a capacity of 153 mA h g⁻¹ with a capacity retention of 33.6%.