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.