Abstract
The Prussian blue cathode material with a unique three-dimensional structure in sodium ion batteries had great potential. Na2MnFe(CN)6 and Na2Mn0.8Fe0.2Fe(CN)6 cathode materials were prepared by the improved co-precipitation method of chelating agent, and the electrochemistry of the half-cell was tested. The results showed that the first discharge capacity of the two materials can reached 152.4mAh/g and 119.5mAh/g respectively at 0.1C(1C=170mA/g). The capacity retention rate of Na2MnFe(CN)6 was only 43.2% after 100 cycles at 0.2C current density, but Na2Mn0.8Fe0.2Fe(CN)6 can reached 70%. The capacity retention of Na2Mn0.8Fe0.2Fe(CN)6 can still reached 69.8% after 100 cycles at 0.5C current density. The discharge specific capacity fluctuation of Na2Mn0.8Fe0.2Fe(CN)6 was smaller than that of Na2MnFe(CN)6.
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