Cobalt sulfide-reduced graphene oxide nanohybrid as high performance sodium ion battery anode

Recently, sodium-ion batteries (SIBs) have attracted much attention in energy storage field due to their cost-effective, safe and nonpoisonous. However, a huge challenges to find suitable material as anode materials for SIBs due to the relative larger radius of sodium ions. Thus, seeking high specific capacity and low cost anode materials for sodium ion storage is a significant challenge in energy storage field. In our work, cobalt sulfide-reduced graphene oxide (CS-RGO) nanohybrid is prepared and studied as anode materials for SIBs. We found that the CS-RGO nanohybrid exhibits an enhancement of the electrochemical performance for SIBs with reversible capacity and cycling performance as compared to cobalt sulfide. The CS-RGO nanohybrid displays a reversible specific capacity of 426.2 mAh g(-1) at a current density of 100 mA g(-1) after 30 cycles, demonstrating that the RGO nanohybrid can effectively improve the sodium ion storage properties of CS-RGO nanohybrid.