Effects of inorganic sodium sources on the performance of O3-NaNi1/3Fe1/3Mn1/3O2
O3-NaNi1/3Fe1/3Mn1/3O2 has the characteristics of high specific capacity,low cost and long cycle life.In order to explore the influence of sodium sources on the electrochemical performance of the material,a series of O3-NaNi1/3Fe1/3Mn1/3O2 materials are obtained by high-temperature solid-state reaction with inorganic sodium salts such as Na2CO3,NaOH,NaHCO3 and Na2SO4 as sodium sources respectively.SEM,X-ray photoelectron spectroscopy(XPS),XRD and BET are employed to characterize the influence of sodium source on morphology,structure and electrochemical performance of the O3-NaNi1/3Fe1/3Mn1/3O2.The materials prepared by different sodium sources are polycrystalline structures formed by primary particle aggregation,and the average secondary particle size of D50 is less than 5 μm.The O3-NaNi1/3Fe1/3Mn1/3O2 obtained by using Na2 CO3 as sodium source has the best electrochemical performance,when the button battery is charged and discharged at 0.1 C in 2.0-4.0 V,the initial specific discharge capacity reaches 141.7 mAh/g,the initial Coulombic efficiency is 95.4%.When the current rate is 1.0 C,the discharge capacity decreases from 137.2 mAh/g to 114.3 mAh/g after 100 cycles,and the capacity retention is 83.3%.
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