One-step preparation of binder-free WO3 CNFs/GO self-supported electrodes

Abstract

In this study, binder-free tungsten oxide carbon nanofibers and graphene oxide composites (WO₃ CNFs/GO) were prepared as self-supporting anodes for lithium-ion batteries (LIBs) by applying a one-step electrostatic spinning technology. Owing to the combination of WO₃ CNFs (WCF) and graphene oxide (GO), the composites exhibit excellent performance by suppressing expansion during the cycle. WO₃ CNFs (WCF) provide excellent continuity and uniform width, and the GO adhered to the WCF forms a cross-linked conductive network and an internal mesoporous environment, which reduces the diffusion distance of electrons/ions and facilitates charge transfer. In addition, the disordered arrangement of WO₃ CNFs (WCFs) can increase the porosity and increase the contact area with the electrolyte, which is more favorable for electrolyte penetration. The WO₃ CNF/GO (WCFG) anode had a specific capacity of 644.6 mA h g⁻¹ after 250 cycles.