Corresponding Author

Han-Xi YANG(hxyang@whu.edu.cn)


Three types of Prussian blue compounds, NaxMyFe(CN)6(M = Fe, Co, Ni), were prepared simply by solution precipitation method and tested as cathode materials for sodium-ion batteries. X-ray diffraction and SEM measurements demonstrated that the prepared materials, namely, NaFeFe(CN)6, Na2CoFe(CN)6, and Na2NiFe(CN)6, exhibited a perfect cubic structure with a particle size of several tens nanometers. Cyclic voltammetric and galvanostatic cycling tests revealed very different electrochemical behaviors of these three materials. The specific capacities of NaFeFe(CN)6 and Na2CoFe(CN)6 could reach 113 mAh?g-1 and 120 mAh?g-1, respectively, indicating that both of the Fe(CN)6-4 and Fe+2/Co+2 ions in the Prussian blue lattices were electrochemically activated. However, Ni ions in the Prussian blue lattice were found to be electrochemically inactive, therefore, the Na2NiFe(CN)6 delivered a specific capacity of only 64 mAh?g-1 but with quite stable cyclability. These preliminary results suggest a possible use of the Prussian blue compounds as low cost and environmentally benign cathode materials for sodium-ion batteries.

Graphical Abstract


Sodium-ion batteries, Prussian blue compounds, NaxMyFe(CN)6(M = Fe, Co, Ni)

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