Abstract：Honeycomb layered Na3Ni2SbO6 cathode materials were doped with Cu instead of Ni to obtain Na3Ni2-xCuxSbO6 (x=0, 0.2, 0.4, 0.8) cathode materials. The morphology, structure and electrochemical properties of the materials were investigated by X-ray diffract to meter and scanning electron microscope. The results show that the cycling stability of Na3Ni2SbO6 cathode materials can be greatly enhanced by Cu substitution, i.e. the Cu-doped Na3Ni1.8Cu0.2SbO6 materials display a discharge capacity of 72.3 mA∙h/g after cycled for 100 cycles at 0.1C rate, while the discharge capacity of pristine Na3Ni2SbO6 cathode is only 39.5 mA∙h/g under the same situation. Through theoretical calculation and experimental analysis, it is found out that the introduction of Cu (Ⅱ) can effectively reduce the band gap of Na3Ni2SbO6 layered cathode materials and the diffusion energy barrier of Na+, and improve the electronic conductivity and ion diffusion performance of the cathode materials, and Cu substitution can also inhibit the adverse phase change of Na3Ni2SbO6 cathode materials during the cycle, thus improving the cycle stability and electrochemical performance of the layered cathode materials.
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2023, Vol. 28 
