Free-standing nitrogen-doped carbon nanofiber films: integrated electrodes for sodium-ion batteries with ultralong cycle life and superior rate capability

Abstract

The fabrication of large-area free-standing porous nitrogen-doped carbon nanofiber films is reported. The flexible film exhibits a high rate capability and ultralong cycle life used for sodium-ion batteries, due to the presence of abundant pores, high nitrogen-doping level, interconnected conductive network, and excellent structural stability of the electrode.