Abstract：K doped O3-type Na0.9-xKxCu0.22Fe0.30Mn0.48O2 (x=0, 0.05, 0.1) cathode materials were prepared by simple solid phase method. The structural stabilities and electrochemical properties of the materials were analyzed and studied by X-ray diffractometer, scanning electron microscope, transmission electron microscope, and electrochemical experiment. The results show that K doping can enhance the structural stability, the Na+ diffusion rate and electrochemical reversibility are also significantly improved. The O3→P3 phase transition occurs earlier and faster, which has a positive effect on improving the energy efficiency of O3-type cathode materials. The O3-type Na0.85K0.05Cu0.22Fe0.30Mn0.48O2 cathode material possesses excellent cycle stability, which can deliver a capacity retention of 88.6% after 150 cycles at 0.5 C. K doping is low-cost and simple to operate, which can help to promote the industrialization of stable high-performance sodium ion batteries.
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2023, Vol. 28 
