Designing PEDOT-modified V6O13 nanosheet arrays for sodium storage

Abstract

Vanadium oxides, such as V6O[Formula: see text], have a high theoretical capacity for sodium storage, but their performance faces the challenges of low conductivity and poor cycling stability caused by side reactions. To solve these problems, we report on the material design of self-supported nanosheet arrays coated with poly(3, 4-ethylenedioxythiophene) (PEDOT). In this design, the nanosheet architecture facilitates the electron and ion transport to boost the charge storage, while the PEDOT coating prevents the direct contact between the electrode nanosheet and the electrolyte, thus inhibiting the occurrence of side reactions. This PEDOT-modified nanosheet electrode exhibits a reversible capacity of 179 mAh g[Formula: see text] in the potential range of 1.5–3.8 V, and retains 66% of the initial capacity at a rate of 1 C for 100 cycles.