NiSx nanoparticles with S/N-doped carbon layer as advanced anode for Li/Na storage

Although NiSx has a high storage advantage in ion battery as the anode material, the shortcomings such as poor conductivity and volume expansion seriously affect the performance. In this work, NiSx nanoparticles with an S/N-doped carbon layer (NiSx@S/N-C) are prepared by a simple hydrothermal reaction combined with heat treatment. At 2 A g(-1), the discharge-specific capacity of the NiSx@S/N-C electrode can achieve at 609 mAh g(-1) at the 400th cycle for lithium-ion batteries. Meanwhile, it shows the 270 mAh g(-1) discharge capacity in the initial cycle and obtains a high specific capacity of 232 mAh g(-1) after 250 cycles at 0.5 A g(-1) for Na storage. In this research, a simple and reliable method is adopted to improve the capacity and performance of transition metal sulfide.