Electrospun three-dimensional V4Nb18O55 nanofibers for advanced lithium uptake

Abstract

Herein, V₄Nb₁₈O₅₅ nanofibers were prepared via a homemade electrospinning route and applied as anode hosts for possible lithium uptake in rechargeable batteries. The as-obtained V₄Nb₁₈O₅₅ products are porous nanofibers with a three-dimensional framework built from ultrafine nanoparticles. Due to their specific hierarchical structure, the V₄Nb₁₈O₅₅ nanofibers exhibit the lithium uptake capacity of 221 mA h g⁻¹, which is much higher than that of the widely reported Li₄Ti₅O₁₂; moreover, the V₄Nb₁₈O₅₅ nanofibers reveal outstanding rate properties for high-power secondary batteries with the specific uptake capacity of 107 mA h g⁻¹ at 8C.