Hierarchical Octahedral Na2MnFe(CN)6 and Na2MnFe(CN)6@Ppy as Cathode Materials for Sodium-Ion Batteries

摘要

The Na2MnFe(CN)6 is successfully synthesized by a simple co-precipitation method,and then coated with conducting polymers (PPy) on the surface of Na2MnFe(CN)6 particle.Interestingly,Na2MnFe(CN)6 and Na2MnFe(CN)6@PPy both show hollow octahedral hierarchical structures with nanometer-sized subunits.Na2MnFe(CN)6@PPy exhibits a discharge capacity of 107 mAh·g-1 after 150 cycles at a current density of 10 mA·g-1.It can still remain 65 mAh·g-1 even the current density is increased to 200 mA·g 1.This superior electrochemical property could be ascribed to unique hierarchical architecture as well as improved electronic conductivity.