Construct pseudo-capacitance of a flexible 3D-entangled carbon nanofiber film as freestanding anode for dual-ion full batteries

Abstract

We construct a remarkable freestanding and porous carbon nanofibers (FPCNFs) as anode materials in the dual-ion full battery. The dual-ion battery (DIB) based on electrolyte including the Li+ and PF6− has a high operating voltage from 3.0 to 5.0 V. The entangled and crossed carbon nanofiber film creates plenty of porous with a high specific surface area (200 m2g−1) to contribute to the pseudo-capacitance effect. The dual-ion full batteries exhibit a stable long-life property up to 500 cycles, an approximately above 4.0V high operating average discharge voltage and an energy density delivering almost 185 W h kg−1 at 0.1 A g−1. The FPCNFs can be a potential alternative toward a cost-efficient high energy density battery anode.