Layered NiPS₃ nanoparticles anchored on two-dimensional nitrogen-doped biochar nanosheets for ultra-high rate sodium-ion storage

The hexagonal layered nickel thiophosphate (NiPS₃) has a great application potential in the field of rechargeable batteries due to the high theoretical specific capacity. In this paper, we described a graphene-like carbon nanosheets (GCSs) substrate with nitrogen-doped by biomass carbonization from Typha angustifolia L. The small sized, layered and good electronic conductive NiPS₃ was grown on the GCSs under the ‘induction effect’ of the uniformly distributed nitrogen atoms. The obtained NiPS₃@GCSs composite was used for anode of sodium-ion batteries (SIBs) and exhibited an excellent rate performance under high current density. The high capacity reached 765 mA h g⁻¹ at the current density of 10 A g⁻¹, and still maintained the capacity of 522 mA h g⁻¹ after 100 cycles, which indicates that the NiPS₃@GCSs composite can be used as high-performance anode materials of SIBs for ultra-fast charge/discharge.