Pseudocapacitive sodium-ion storage in one-dimensionally structured anatase TiO2 nanofiber anode for high performance sodium-ion batteries

Abstract

<p>Nanofibers provide high surface area to volume ratio, vectoral conduction, fast ionic diffusion, and short pathways for sodium ions. Titania nanofibers exhibit excellent electrochemical performance when used for sodium-ion storage. One-dimensional titania nanofiber was synthesized by an electrospinning process as an anode material for high capacity sodium-ion batteries. The electrochemical kinetics of titania nanofiber for sodium-ion storage were examined. Titania nanofiber exhibited pseudocapacitive capacitive properties with high rate performance, giving capacity of 97 mA h g-1 after 1000 cycles with a current density of 1000 mA g-1. Even when current rate returned to the initial current density of 50 mA g- 1, titania nanofiber electrode capacity climbed to 206 mA h g-1 again without capacity fading, which indicated good rate performance, superior sodium insertion/extraction reaction, and high reversible capacity.</p>