Enhanced conductivity and properties of SnO2-graphene-carbon nanofibers for potassium-ion batteries by graphene modification

In this study, the SnO2-graphene-carbon (SnO2-G-C) nanofibers are synthetized via an electrospinning method and employed as potential KIB anodes. The SnO2-G-C anodes exhibit a great cycling stability of 202.06 mA h/g over 100 cycles at the current density of 100 mA/g, as well as the high rate capacity of 114.81 mA h/g at 1 A/g. The enhanced electrochemical properties of SnO2-G-C comparing to SnO2-carbon (SnO2-C) counterpart can be ascribed to the dispersive graphene inside the carbon nanofibers, which offers flexible buffer matrix and protects the active materials from destruction. Meanwhile, the graphene facilitates the electrons transportation, leading to the good rate capability.