Multifunctional conducing polymer coated Na1+xMnFe(CN)6 cathode for sodium-ion batteries with superior performance via a facile and one-step chemistry approach

A facile, one-step, soft chemistry approach is developed to synthesize ClO4-doped polypyrrole coated Na1+xMnFe(CN)(6) composite as a cathode material (NMHFC@PPy) for SIBs. PPy plays multiple important roles in the composite. First, PPy serves as a conductive coating layer which can increase the electronic conductivity of NMHFC to improve the rate capability. Second, PPy can act as a protective layer to reduce the dissolution of Mn in the electrolyte to improve the cycling performance. Finally, the PPy doped with ClO4 can act as active materials to increase the capacity of the composite. NMHFC@PPy shows high energy density (428 W h kg 1), enhanced cycling performance (67% capacity retention after 200 cycles), and excellent rate capacity (46% capacity for 40 degrees C rate). (C) 2015 Elsevier Ltd. All rights reserved.