Effects of binders on electrochemical sodium storage performance with porous CoFe2O4 nanocubes derived from metal-organic frameworks

Abstract Porous CoFe 2 O 4 nanocubes (PCFO-NCs) was prepared simply by annealing metal-organic frameworks Prussian blue and used as anode with different binders for sodium ion batteries (SIBs). The water-soluble binders (carboxyl methyl cellulose, CMC and polyacrylic acid, PAA) significantly improve the cycling stability of PCFO-NCs, especially for the electrode with CMC binder. The electrodes with CMC and PAA binders show the capacities of 394 and 310 mAh g −1 after 50 cycles with good cycling stability. Electrochemical impedance spectroscopy shows that the CMC binder delivers the highest sodium diffusion coefficient, the lowest R ct and E a , which facilitates the reactions at the electrode/electrolyte interface. These advantages highlight the potential applications of CMC binder in SIBs.