Prussian blue grown on PEDOT-wrapped multi-wall carbon nanotubes as advanced cathode materials for sodium-ion batteries

Prussian blue is a potential cathode candidate for sodium-ion batteries because of inexpensiveness and high theoretical capacity, while the poor rate performance hinders its widely practical application. In this work, the Prussian blue is directly grown on poly3,4-ethylenedioxythiophene decorated multi-wall carbon nanotubes (denoted as PB/CNT@PEDOT), where the CNT@PEDOT can provide improved electrical conductivity and lower the size of PB. Thus, the PB/CNT@PEDOT shows a discharge capacity of 85 mAh g −1 after 100 cycles at 0.2C. Compare to PB and PB/CNT, the PB/CNT@PEDOT delivers enhanced rate capability with 90 mAh g −1 retention at 5C.