NiS1?xSex Nanoparticles Anchored on Nitrogen-Doped Reduced Graphene Oxide as Highly Stable Anode for Sodium-Ion Battery

Nickel sulfides are regarded as one of the promising anode materials for sodium-ion batteries (SIBs), but sluggish electrodes kinetics and rapid capacity decay, caused by their intrinsic low electrical conductivity high bulk expansion, greatly limit practical application. To overcome these obstacles, nano-sized, selenium-doped, nickel sulfide particles, anchored on nitrogen-doped reduced graphene oxide composites (NiS1?xSex@N–rGO), rationally synthesized. The broad Na+ diffusion channels, resulting from Se doping, well short transferring path, attributed nano-size scale NiS1?xSex endow NiS1?xSex@N–rGO with ultrafast storage kinetics. Moreover, strong coupled effect between N–rGO is beneficial to uniform dispersion nanoparticles, improving suppressing volume variation in charge/discharge process. Furthermore, cut-off discharge voltage modulated realize smaller change during cycle As a result, fabricated SIBs based exhibits specific 300 mAh g?1, at current density 1 A after 1000 cycles almost no degradation.