铜元素掺杂改性蜂窝层状Na3Ni2SbO6 正极材料的电化学性能

doi:10.19976/j.cnki.43-1448/TF.2022089

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Abstract Honeycomb layered Na₃Ni₂SbO₆ cathode materials were doped with Cu instead of Ni to obtain Na₃Ni_2-_xCu_xSbO₆ (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 Na₃Ni_1.8Cu_0.2SbO₆ 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.

Key words： cathode materials specific capacity phase transition cycle stability electrochemical performance

Received: 16 December 2022 Published: 23 March 2023

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	CHEN Lin
	HUANG Qun
	CHEN Cheng
	FENG Yiming
	WEI Weifeng

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CHEN Lin,HUANG Qun,CHEN Cheng, et al. Electrochemical properties of copper doped honeycomb-layered Na₃Ni₂SbO₆cathode materials[J]. Materials Science and Engineering of Powder Metallurgy, 2023, 28(1): 9-11.

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http://pmbjb.csu.edu.cn/EN/10.19976/j.cnki.43-1448/TF.2022089 OR http://pmbjb.csu.edu.cn/EN/Y2023/V28/I1/9

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