| dc.description.abstract | The crystal structure of Prussian blue has the function of storing free ions in the battery, and the central hole is large, which can accommodate most alkali metal ions. The structure of the crystal is also relatively stable, and the structure is not easily changed after repeated redox reactions, which is equivalent to a large number of charge-discharge cycles. Prussian blue has the advantages of simple production method, low cost, environmental protection and large theoretical electric capacity. It is a potential negative electrode material in secondary batteries.
In this experiment, the samples were prepared by the precipitation method. Na-FeFe Prussian blue will have different particle sizes at different process temperatures. The Na-FeFe Prussian blue sample is scanned with an X-ray diffractometer, and the scanned X-ray diffraction spectrum is then used to structure the General Structure Analysis System (GSAS) Actuarial software for particle size and characteristic analysis.
After the secondary lithium-ion battery was prepared, it was put into a charge-discharge apparatus to conduct a constant-current charge-discharge experiment. After the charge and discharge test is completed, the data is subjected to the battery differential curve, voltage curve, capacitance curve and voltage flow chart to know the charge and discharge efficiency of the Na-FeFe Prussian blue secondary lithium battery under the conditions of different particle sizes. How, in the case of variable current, the impact on the charging and discharging of the battery, and how the charging and discharging efficiency will become if the battery is stopped for one day after charging and discharging. | en_US |