RESUMO
Facile preparation of rational SnOx-based electrode materials with excellent electrochemical performance is highly desired for lithium ion batteries (LIBs). In this work, carbon framework microbelt supporting SnOx nanoparticles (CFM-SnOx) were prepared via a facile electrospinning technology and annealing treatment process. The as-synthesized CFM-SnOx electrode exhibits high reversible capacity of 768 mAh g-1 at 0.2 A g-1 after 200 cycles, high rate capacity of 535 mAh g-1 at high current density of 3.2 A g-1. The facile synthesis and superior performance indicate that the as-synthesized CFM-SnOx is a competitive anode material for LIBs.
RESUMO
Graphene fibers are promising candidates in portable and wearable electronics due to their tiny volume, flexibility and wearability. Here, we successfully synthesized macroscopic graphene composite fibers via a two-step process, i.e. first electrospinning and then chemical vapor deposition (CVD). Briefly, the well-dispersed PAN nanofibers were sprayed onto the copper surface in an electrified thin liquid jet by electrospinning. Subsequently, CVD growth process induced the formation of graphene films using a PAN-solid source of carbon and a copper catalyst. Finally, crumpled and macroscopic graphene composite fibers were obtained from carbon nanofiber/graphene composite webs by self-assembly process in the deionized water. Temperature-dependent conduct behavior reveals that electron transport of the graphene composite fibers belongs to hopping mechanism and the typical electrical conductivity reaches 4.59 × 103 S m-1. These results demonstrated that the graphene composite fibers are promising for the next-generation flexible and wearable electronics.