Synthesis and performance of polycrystalline material NaNi1/3Fe1/3Mn1/3O2
In the future energy storage market and low-speed vehicle field,sodium-ion battery has broad prospects,the choice of cathode materials is critical.The layered oxide of NaNi1/3Fe1/3Mn1/3O2(NFM333)is prepared by co-precipitation method combined with high temperature sintering.By means of XRD,SEM and galvanostatic charge-discharge,the structure,morphology and electro-chemical performance of the NFM333 material are analyzed.NFM333 material has a typical O3 structure and a characteristic of polycrystalline,which can provide high-capacity storage,good rate capability and stable cycle performance as the cathode material of sodium-ion battery.When charged and discharged at 0.3 C in 2.0-4.0 V,the specific discharge capacities of materials at-20℃,-30℃and-40℃are 85.55%,72.88%and 45.19%,respectively,compared with that at 20℃.Cyclic voltammetry(CV)tests prove that the better electrochemical performance can be attributed to the high ion diffusion rate and good ion migration kinetics.
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