One pot synthesis and capacitive sodium storage properties of rGO confifined CoS2 anode materials

Abstract: A facile and scalable hydrothermal method is utilized to synthesize CoS2 nanooctahedrons decorated rGO hybrids with varied compositions. The as-obtained CoS2/rGO nanocomposites exhibit the morphology of nanooctahedrons with size of ~300 nm decorated on the wrinkled rGO nanosheets, while pure CoS2 is assembled into micro-sized aggregates. By virtue of rGO, CoS2/rGO nanocomposites provide reduced diffusion length and enhanced electrical conductivity. Importantly, the CoS2/rGO-40 electrode delivers a reversible capacity of 825 mAh g 1 after 40 cycles at 0.1 A g 1 . Even at 1 A g 1 , it can still maintain a capacity of 658 mAh g 1 after 150 cycles. Further kinetic analysis demonstrates a more favored capacitive behavior. The superior sodium storage performance reveals that CoS2/rGO nanocomposites can be promising anodes for sodium ion batteries.

Liu Xue, et al. Onepot synthesis and capacitive sodium storage properties of rGO confined CoS2anode materials. Journal of Alloys andCompounds, 2020, 813, 151598.